diff --git a/build.gradle.kts b/build.gradle.kts
index 7835537..1c30ca2 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,11 +1,12 @@
-@file:Suppress("UnstableApiUsage")
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 plugins {
   `kotlin-dsl`
 
   `maven-publish`
   `java-gradle-plugin`
 
-  id("com.gradle.plugin-publish") version "1.2.0"
+  id("com.gradle.plugin-publish") version "1.3.1"
 }
 
 group = "gay.pizza.foundation"
@@ -17,13 +18,13 @@ repositories {
 }
 
 dependencies {
-  implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.21")
-  implementation("org.jetbrains.kotlin:kotlin-serialization:1.8.21")
-  implementation("com.github.johnrengelman:shadow:8.1.1")
-  implementation("com.google.code.gson:gson:2.10.1")
+  implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:2.1.20")
+  implementation("org.jetbrains.kotlin:kotlin-serialization:2.1.20")
+  implementation("com.gradleup.shadow:com.gradleup.shadow.gradle.plugin:8.3.6")
+  implementation("com.google.code.gson:gson:2.12.1")
 
   // Implementation of crypto used in smart downloader.
-  implementation("org.bouncycastle:bcprov-jdk15on:1.70")
+  implementation("org.bouncycastle:bcprov-jdk18on:1.80")
 }
 
 gradlePlugin {
@@ -78,14 +79,14 @@ if (gradlePublishingKey != null && gradlePublishingSecret != null) {
 }
 
 java {
-  val version = JavaVersion.toVersion("17")
+  val version = JavaVersion.toVersion("21")
   sourceCompatibility = version
   targetCompatibility = version
 }
 
 tasks.compileKotlin {
-  kotlinOptions {
-    jvmTarget = "17"
+  compilerOptions {
+    jvmTarget.value(JvmTarget.JVM_21)
   }
 }
 
@@ -128,7 +129,7 @@ publishing {
 }
 
 tasks.withType<Wrapper> {
-  gradleVersion = "8.1.1"
+  gradleVersion = "8.13"
 }
 
 java {
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index ccebba7..c1962a7 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 37aef8d..c6f0030 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.1.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
 networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index 79a61d4..aeb74cb 100755
--- a/gradlew
+++ b/gradlew
@@ -85,9 +85,6 @@ done
 APP_BASE_NAME=${0##*/}
 APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
-
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
 
@@ -197,6 +194,10 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
 # Collect all arguments for the java command;
 #   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
 #     shell script including quotes and variable substitutions, so put them in
diff --git a/samples/mixed/bukkit-plugins/build.gradle.kts b/samples/mixed/bukkit-plugins/build.gradle.kts
index 7daa471..20192bd 100644
--- a/samples/mixed/bukkit-plugins/build.gradle.kts
+++ b/samples/mixed/bukkit-plugins/build.gradle.kts
@@ -4,8 +4,8 @@ plugins {
 
 concreteRoot {
   minecraftServerPath.set("server")
-  paperServerVersionGroup.set("1.19")
-  paperApiVersion.set("1.19.3-R0.1-SNAPSHOT")
+  paperServerVersionGroup.set("1.21")
+  paperApiVersion.set("1.21.4-R0.1-SNAPSHOT")
   acceptServerEula.set(true)
   expansiveItemInclusion.set(true)
 }
diff --git a/samples/mixed/gradle/wrapper/gradle-wrapper.jar b/samples/mixed/gradle/wrapper/gradle-wrapper.jar
index ccebba7..9bbc975 100644
Binary files a/samples/mixed/gradle/wrapper/gradle-wrapper.jar and b/samples/mixed/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/samples/mixed/gradle/wrapper/gradle-wrapper.properties b/samples/mixed/gradle/wrapper/gradle-wrapper.properties
index 37aef8d..37f853b 100644
--- a/samples/mixed/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/mixed/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.1.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
 networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/samples/mixed/gradlew b/samples/mixed/gradlew
index 79a61d4..faf9300 100755
--- a/samples/mixed/gradlew
+++ b/samples/mixed/gradlew
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -55,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -83,10 +85,8 @@ done
 # This is normally unused
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
-APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -133,10 +133,13 @@ location of your Java installation."
     fi
 else
     JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
@@ -144,7 +147,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
         # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
@@ -152,7 +155,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
       '' | soft) :;; #(
       *)
         # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -197,11 +200,15 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
-# Collect all arguments for the java command;
-#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
-#     shell script including quotes and variable substitutions, so put them in
-#     double quotes to make sure that they get re-expanded; and
-#   * put everything else in single quotes, so that it's not re-expanded.
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
diff --git a/samples/mixed/gradlew.bat b/samples/mixed/gradlew.bat
index 93e3f59..9d21a21 100644
--- a/samples/mixed/gradlew.bat
+++ b/samples/mixed/gradlew.bat
@@ -13,6 +13,8 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
@@ -43,11 +45,11 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -57,11 +59,11 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
diff --git a/samples/shared/build.gradle.kts b/samples/shared/build.gradle.kts
index 569ba7c..21b07e9 100644
--- a/samples/shared/build.gradle.kts
+++ b/samples/shared/build.gradle.kts
@@ -5,7 +5,7 @@ plugins {
 
 concreteRoot {
   minecraftServerPath.set("server")
-  paperServerVersionGroup.set("1.19")
-  paperApiVersion.set("1.19.3-R0.1-SNAPSHOT")
+  paperServerVersionGroup.set("1.21")
+  paperApiVersion.set("1.21.4-R0.1-SNAPSHOT")
   acceptServerEula.set(true)
 }
diff --git a/samples/shared/gradle/wrapper/gradle-wrapper.jar b/samples/shared/gradle/wrapper/gradle-wrapper.jar
index ccebba7..9bbc975 100644
Binary files a/samples/shared/gradle/wrapper/gradle-wrapper.jar and b/samples/shared/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/samples/shared/gradle/wrapper/gradle-wrapper.properties b/samples/shared/gradle/wrapper/gradle-wrapper.properties
index 37aef8d..37f853b 100644
--- a/samples/shared/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/shared/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.1.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
 networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/samples/shared/gradlew b/samples/shared/gradlew
index 79a61d4..faf9300 100755
--- a/samples/shared/gradlew
+++ b/samples/shared/gradlew
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -55,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -83,10 +85,8 @@ done
 # This is normally unused
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
-APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -133,10 +133,13 @@ location of your Java installation."
     fi
 else
     JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
@@ -144,7 +147,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
         # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
@@ -152,7 +155,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
       '' | soft) :;; #(
       *)
         # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -197,11 +200,15 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
-# Collect all arguments for the java command;
-#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
-#     shell script including quotes and variable substitutions, so put them in
-#     double quotes to make sure that they get re-expanded; and
-#   * put everything else in single quotes, so that it's not re-expanded.
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
diff --git a/samples/shared/gradlew.bat b/samples/shared/gradlew.bat
index 93e3f59..9d21a21 100644
--- a/samples/shared/gradlew.bat
+++ b/samples/shared/gradlew.bat
@@ -13,6 +13,8 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
@@ -43,11 +45,11 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -57,11 +59,11 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
diff --git a/samples/simple/build.gradle.kts b/samples/simple/build.gradle.kts
index 9d0ffad..dbf018b 100644
--- a/samples/simple/build.gradle.kts
+++ b/samples/simple/build.gradle.kts
@@ -4,7 +4,7 @@ plugins {
 
 concreteRoot {
   minecraftServerPath.set("server")
-  paperServerVersionGroup.set("1.19")
-  paperApiVersion.set("1.19.3-R0.1-SNAPSHOT")
+  paperServerVersionGroup.set("1.21")
+  paperApiVersion.set("1.21.4-R0.1-SNAPSHOT")
   acceptServerEula.set(true)
 }
diff --git a/samples/simple/gradle/wrapper/gradle-wrapper.jar b/samples/simple/gradle/wrapper/gradle-wrapper.jar
index ccebba7..9bbc975 100644
Binary files a/samples/simple/gradle/wrapper/gradle-wrapper.jar and b/samples/simple/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/samples/simple/gradle/wrapper/gradle-wrapper.properties b/samples/simple/gradle/wrapper/gradle-wrapper.properties
index 37aef8d..37f853b 100644
--- a/samples/simple/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/simple/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.1.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
 networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/samples/simple/gradlew b/samples/simple/gradlew
index 79a61d4..faf9300 100755
--- a/samples/simple/gradlew
+++ b/samples/simple/gradlew
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -55,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -83,10 +85,8 @@ done
 # This is normally unused
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
-APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -133,10 +133,13 @@ location of your Java installation."
     fi
 else
     JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
@@ -144,7 +147,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
         # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
@@ -152,7 +155,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
       '' | soft) :;; #(
       *)
         # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -197,11 +200,15 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
-# Collect all arguments for the java command;
-#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
-#     shell script including quotes and variable substitutions, so put them in
-#     double quotes to make sure that they get re-expanded; and
-#   * put everything else in single quotes, so that it's not re-expanded.
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
diff --git a/samples/simple/gradlew.bat b/samples/simple/gradlew.bat
index 93e3f59..9d21a21 100644
--- a/samples/simple/gradlew.bat
+++ b/samples/simple/gradlew.bat
@@ -13,6 +13,8 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
@@ -43,11 +45,11 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -57,11 +59,11 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
diff --git a/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteBaseBukkitPlugin.kt b/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteBaseBukkitPlugin.kt
index 600c818..318c068 100644
--- a/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteBaseBukkitPlugin.kt
+++ b/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteBaseBukkitPlugin.kt
@@ -11,7 +11,7 @@ open class ConcreteBaseBukkitPlugin : ConcreteBasePlugin() {
     project.repositories {
       maven {
         name = "papermc"
-        url = URI.create("https://papermc.io/repo/repository/maven-public/")
+        url = URI.create("https://repo.papermc.io/repository/maven-public/")
       }
     }
 
diff --git a/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteBasePlugin.kt b/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteBasePlugin.kt
index d026aad..449ebb8 100644
--- a/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteBasePlugin.kt
+++ b/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteBasePlugin.kt
@@ -7,6 +7,7 @@ import org.gradle.api.plugins.JavaPluginExtension
 import org.gradle.kotlin.dsl.create
 import org.gradle.kotlin.dsl.getByType
 import org.gradle.kotlin.dsl.withType
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 open class ConcreteBasePlugin : Plugin<Project> {
@@ -29,15 +30,15 @@ open class ConcreteBasePlugin : Plugin<Project> {
     project.plugins.apply("org.jetbrains.kotlin.plugin.serialization")
 
     project.extensions.getByType<JavaPluginExtension>().apply {
-      val javaVersion = JavaVersion.toVersion(17)
+      val javaVersion = JavaVersion.toVersion(21)
       sourceCompatibility = javaVersion
       targetCompatibility = javaVersion
     }
 
     project.tasks.withType<KotlinCompile>().forEach {
       it.apply {
-        kotlinOptions.apply {
-          jvmTarget = "17"
+        compilerOptions {
+          jvmTarget.value(JvmTarget.JVM_21)
         }
       }
     }
diff --git a/src/main/kotlin/gay/pizza/foundation/concrete/ConcretePluginPlugin.kt b/src/main/kotlin/gay/pizza/foundation/concrete/ConcretePluginPlugin.kt
index 277b7ff..4343d4d 100644
--- a/src/main/kotlin/gay/pizza/foundation/concrete/ConcretePluginPlugin.kt
+++ b/src/main/kotlin/gay/pizza/foundation/concrete/ConcretePluginPlugin.kt
@@ -4,12 +4,11 @@ import org.gradle.api.Project
 import org.gradle.kotlin.dsl.get
 import org.gradle.language.jvm.tasks.ProcessResources
 
-@Suppress("UnstableApiUsage")
 class ConcretePluginPlugin : ConcreteBaseBukkitPlugin() {
   override fun apply(project: Project) {
     super.apply(project)
 
-    project.plugins.apply("com.github.johnrengelman.shadow")
+    project.plugins.apply("com.gradleup.shadow")
 
     // During IDEA project import, if this code is active, it will print warnings.
     // This will make the VERSION field unexpanded if you run using the IntelliJ build system.
diff --git a/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteRootPlugin.kt b/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteRootPlugin.kt
index e7be0c7..6896813 100644
--- a/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteRootPlugin.kt
+++ b/src/main/kotlin/gay/pizza/foundation/concrete/ConcreteRootPlugin.kt
@@ -4,14 +4,15 @@ import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.kotlin.dsl.apply
 import org.gradle.kotlin.dsl.create
+import org.gradle.kotlin.dsl.register
 import java.nio.file.Paths
 
 class ConcreteRootPlugin : Plugin<Project> {
   override fun apply(project: Project) {
     project.apply(plugin = "base")
     project.extensions.create<ConcreteRootExtension>("concreteRoot")
-    val setupPaperServer = project.tasks.create<SetupPaperServer>("setupPaperServer")
-    val runPaperServer = project.tasks.create<RunPaperServer>("runPaperServer")
+    val setupPaperServer = project.tasks.register<SetupPaperServer>("setupPaperServer").get()
+    val runPaperServer = project.tasks.register<RunPaperServer>("runPaperServer").get()
     runPaperServer.dependsOn(setupPaperServer)
 
     val maybeLocalServerPathString = project.properties["localMinecraftServerPath"]?.toString()
@@ -20,8 +21,8 @@ class ConcreteRootPlugin : Plugin<Project> {
       val localServerJarFileName = project.properties["localMinecraftServerJarFileName"]?.toString() ?: "server.jar"
       val currentWorkingDirectory = System.getProperty("user.dir")
       val localServerDirectory = Paths.get(currentWorkingDirectory).resolve(maybeLocalServerPathString).toFile()
-      val setupLocalMinecraftServer = project.tasks.create<SetupLocalMinecraftServer>("setupLocalMinecraftServer")
-      val runLocalMinecraftServer = project.tasks.create<RunLocalMinecraftServer>("runLocalMinecraftServer")
+      val setupLocalMinecraftServer = project.tasks.register<SetupLocalMinecraftServer>("setupLocalMinecraftServer").get()
+      val runLocalMinecraftServer = project.tasks.register<RunLocalMinecraftServer>("runLocalMinecraftServer").get()
       runLocalMinecraftServer.dependsOn(setupLocalMinecraftServer)
 
       setupLocalMinecraftServer.minecraftServerDirectory = localServerDirectory
@@ -29,7 +30,7 @@ class ConcreteRootPlugin : Plugin<Project> {
       runLocalMinecraftServer.serverJarFileName = localServerJarFileName
     }
 
-    val updateManifests = project.tasks.create<UpdateManifestTask>("updateManifests")
+    val updateManifests = project.tasks.register<UpdateManifestTask>("updateManifests")
     project.tasks.getByName("assemble").dependsOn(updateManifests)
   }
 }
diff --git a/src/main/kotlin/gay/pizza/foundation/concrete/PaperVersionClient.kt b/src/main/kotlin/gay/pizza/foundation/concrete/PaperVersionClient.kt
index 167e521..bc7ea32 100644
--- a/src/main/kotlin/gay/pizza/foundation/concrete/PaperVersionClient.kt
+++ b/src/main/kotlin/gay/pizza/foundation/concrete/PaperVersionClient.kt
@@ -10,7 +10,7 @@ class PaperVersionClient(
   private val client: HttpClient = HttpClient.newHttpClient(),
   private val gson: Gson = Globals.gson
 ) {
-  private val apiBaseUrl = URI.create("https://papermc.io/api/v2/")
+  private val apiBaseUrl = URI.create("https://api.papermc.io/v2/")
 
   fun getVersionBuilds(group: String): List<PaperBuild> {
     val response = client.send(
diff --git a/src/main/kotlin/gay/pizza/foundation/concrete/RunLocalMinecraftServer.kt b/src/main/kotlin/gay/pizza/foundation/concrete/RunLocalMinecraftServer.kt
index 82907be..6155db4 100644
--- a/src/main/kotlin/gay/pizza/foundation/concrete/RunLocalMinecraftServer.kt
+++ b/src/main/kotlin/gay/pizza/foundation/concrete/RunLocalMinecraftServer.kt
@@ -1,9 +1,11 @@
 package gay.pizza.foundation.concrete
 
 import org.gradle.api.tasks.Internal
+import org.gradle.process.ExecOperations
 import java.io.File
+import javax.inject.Inject
 
-open class RunLocalMinecraftServer : RunMinecraftServer() {
+open class RunLocalMinecraftServer @Inject constructor(execOperations: ExecOperations) : RunMinecraftServer(execOperations) {
   @Internal
   lateinit var minecraftServerDirectory: File
 
diff --git a/src/main/kotlin/gay/pizza/foundation/concrete/RunMinecraftServer.kt b/src/main/kotlin/gay/pizza/foundation/concrete/RunMinecraftServer.kt
index 25e1ffe..1460203 100644
--- a/src/main/kotlin/gay/pizza/foundation/concrete/RunMinecraftServer.kt
+++ b/src/main/kotlin/gay/pizza/foundation/concrete/RunMinecraftServer.kt
@@ -4,10 +4,12 @@ import org.gradle.api.DefaultTask
 import org.gradle.api.tasks.Input
 import org.gradle.api.tasks.Internal
 import org.gradle.api.tasks.TaskAction
+import org.gradle.process.ExecOperations
 import java.io.File
 import java.util.jar.JarFile
+import javax.inject.Inject
 
-abstract class RunMinecraftServer : DefaultTask() {
+abstract class RunMinecraftServer @Inject constructor(private var execOperations: ExecOperations) : DefaultTask() {
   init {
     outputs.upToDateWhen { false }
   }
@@ -24,7 +26,7 @@ abstract class RunMinecraftServer : DefaultTask() {
     val serverJarFile = minecraftServerDirectory.resolve(getServerJarName())
     val mainClassName = readMainClass(serverJarFile)
 
-    project.javaexec {
+    execOperations.javaexec {
       classpath(serverJarFile.absolutePath)
       workingDir(minecraftServerDirectory)
 
diff --git a/src/main/kotlin/gay/pizza/foundation/concrete/RunPaperServer.kt b/src/main/kotlin/gay/pizza/foundation/concrete/RunPaperServer.kt
index 6037299..3568b5b 100644
--- a/src/main/kotlin/gay/pizza/foundation/concrete/RunPaperServer.kt
+++ b/src/main/kotlin/gay/pizza/foundation/concrete/RunPaperServer.kt
@@ -2,9 +2,11 @@ package gay.pizza.foundation.concrete
 
 import org.gradle.api.tasks.Internal
 import org.gradle.kotlin.dsl.getByType
+import org.gradle.process.ExecOperations
 import java.io.File
+import javax.inject.Inject
 
-open class RunPaperServer : RunMinecraftServer() {
+open class RunPaperServer @Inject constructor(execOperations: ExecOperations) : RunMinecraftServer(execOperations) {
   init {
     outputs.upToDateWhen { false }
   }
diff --git a/src/main/kotlin/gay/pizza/foundation/concrete/SetupPaperServer.kt b/src/main/kotlin/gay/pizza/foundation/concrete/SetupPaperServer.kt
index 9c3f5dc..4a14d36 100644
--- a/src/main/kotlin/gay/pizza/foundation/concrete/SetupPaperServer.kt
+++ b/src/main/kotlin/gay/pizza/foundation/concrete/SetupPaperServer.kt
@@ -20,6 +20,7 @@ open class SetupPaperServer : SetupMinecraftServer() {
   fun setupPaperServer() {
     val concrete = project.extensions.getByType<ConcreteRootExtension>()
     val minecraftServerDirectory = getServerDirectory()
+    minecraftServerDirectory.mkdirs()
     val paperJarFile = project.file("${minecraftServerDirectory}/paper.jar")
     if (!paperJarFile.exists() || shouldUpdatePaperServer) {
       downloadLatestBuild(concrete.paperServerVersionGroup.get(), paperJarFile)
diff --git a/src/main/kotlin/gay/pizza/foundation/concrete/UpdateManifestTask.kt b/src/main/kotlin/gay/pizza/foundation/concrete/UpdateManifestTask.kt
index 76f0f19..2b5aa03 100644
--- a/src/main/kotlin/gay/pizza/foundation/concrete/UpdateManifestTask.kt
+++ b/src/main/kotlin/gay/pizza/foundation/concrete/UpdateManifestTask.kt
@@ -2,10 +2,9 @@ package gay.pizza.foundation.concrete
 
 import org.gradle.api.DefaultTask
 import org.gradle.api.tasks.TaskAction
-import java.nio.file.Files
 import java.nio.file.Path
-import kotlin.io.path.name
 import kotlin.io.path.relativeTo
+import kotlin.io.path.writeText
 
 open class UpdateManifestTask : DefaultTask() {
   @TaskAction
@@ -29,7 +28,7 @@ open class UpdateManifestTask : DefaultTask() {
     }.toMap()
 
     val legacyUpdateFile = manifestsDir.resolve("update.json")
-    Files.writeString(legacyUpdateFile, Globals.gson.toJson(legacyUpdateManifest))
+    legacyUpdateFile.writeText(Globals.gson.toJson(legacyUpdateManifest))
 
     val extensibleUpdateManifestItems = project.findItemProjects().map { project ->
       val concreteItemExtension = project.concreteItemExtension!!
@@ -60,12 +59,11 @@ open class UpdateManifestTask : DefaultTask() {
     )
 
     val extensibleUpdateManifestFile = manifestsDir.resolve("manifest.json")
-    Files.writeString(
-      extensibleUpdateManifestFile, Globals.gsonPretty.toJson(extensibleUpdateManifest) + "\n")
+    extensibleUpdateManifestFile.writeText(Globals.gson.toJson(extensibleUpdateManifest) + "\n")
   }
 
   private fun ensureManifestsDirectory(): Path {
-    val manifestsDir = project.buildDir.resolve("manifests")
+    val manifestsDir = project.layout.buildDirectory.asFile.get().resolve("manifests")
     manifestsDir.mkdirs()
     return manifestsDir.toPath()
   }