diff --git a/Package.swift b/Package.swift
index 00cf21b..c6950ce 100644
--- a/Package.swift
+++ b/Package.swift
@@ -12,7 +12,7 @@ import PackageDescription
 let package = Package(
     name: "Adwaita",
     platforms: [
-        .macOS(.v13)
+        .macOS(.v10_15)
     ],
     products: [
         .library(
diff --git a/Sources/Generation/GIR/Class.swift b/Sources/Generation/GIR/Class.swift
index e6e5fc3..b9b03b6 100644
--- a/Sources/Generation/GIR/Class.swift
+++ b/Sources/Generation/GIR/Class.swift
@@ -74,7 +74,7 @@ struct Class: ClassLike, Decodable {
         //  \(widgetName).swift
         //  Adwaita
         //
-        //  Created by auto-generation on \(dateFormatter.string(from: .now)).
+        //  Created by auto-generation on \(dateFormatter.string(from: .init())).
         //
 
         import CAdw
diff --git a/Sources/Generation/Generation.swift b/Sources/Generation/Generation.swift
index 8843c88..e32334f 100644
--- a/Sources/Generation/Generation.swift
+++ b/Sources/Generation/Generation.swift
@@ -74,7 +74,7 @@ struct Generation {
     func getGtkDefinitions(path: String) -> GIR? {
         var path = path
         let girDir = getGtkGirDir()
-        path.replace(GenerationConfiguration.gtkIncludeDir, with: girDir)
+        path = path.replacingOccurrences(of: GenerationConfiguration.gtkIncludeDir, with: girDir)
         let data = (try? Data(contentsOf: .init(fileURLWithPath: path))) ?? .init()
         return try? GIR.decodeGIR(data)
     }
@@ -85,7 +85,7 @@ struct Generation {
     func getAdwDefinitions(path: String) -> GIR? {
         var path = path
         let girDir = getAdwGirDir()
-        path.replace(GenerationConfiguration.adwIncludeDir, with: girDir)
+        path = path.replacingOccurrences(of: GenerationConfiguration.adwIncludeDir, with: girDir)
         let data = (try? Data(contentsOf: .init(fileURLWithPath: path))) ?? .init()
         return try? GIR.decodeGIR(data)
     }