diff --git a/Sources/apk/Common/ApkRequirement.swift b/Sources/apk/Common/ApkRequirement.swift
index 29f99d1..7fb0638 100644
--- a/Sources/apk/Common/ApkRequirement.swift
+++ b/Sources/apk/Common/ApkRequirement.swift
@@ -14,7 +14,7 @@ internal struct ApkRequirement: Hashable {
     self.versionSpec = spec
   }
 
-  init(extract: String) throws(ParseError) {
+  init(extract: Substring) throws(ParseError) {
     var comparer: ComparatorBits = []
     var dependStr = extract[...]
     let nameEnd: String.Index, versionStart: String.Index
diff --git a/Sources/apk/Index/ApkIndexPackage.swift b/Sources/apk/Index/ApkIndexPackage.swift
index 1959637..3c5952c 100644
--- a/Sources/apk/Index/ApkIndexPackage.swift
+++ b/Sources/apk/Index/ApkIndexPackage.swift
@@ -75,7 +75,7 @@ extension ApkIndexPackage {
         architecture = record.value
       case "D":
         do {
-          dependencies = try record.value.components(separatedBy: " ")
+          dependencies = try record.value.split(separator: " ")
             .map { .init(requirement: try .init(extract: $0)) }
         } catch { throw .badValue(key: record.key) }
       case "C":
@@ -95,12 +95,12 @@ extension ApkIndexPackage {
         installedSize = value
       case "p":
         do {
-          provides = try record.value.components(separatedBy: " ")
+          provides = try record.value.split(separator: " ")
             .map { .init(requirement: try .init(extract: $0)) }
         } catch { throw .badValue(key: record.key) }
       case "i":
         do {
-          installIf = try record.value.components(separatedBy: " ")
+          installIf = try record.value.split(separator: " ")
             .map { .init(requirement: try .init(extract: $0)) }
         } catch { throw .badValue(key: record.key) }
       case "o":