diff --git a/Package.swift b/Package.swift
index f06db024..0d2d2ea6 100644
--- a/Package.swift
+++ b/Package.swift
@@ -17,7 +17,7 @@ import PackageDescription
 let package = Package(
     name: "swift-openapi-runtime",
     platforms: [
-        .macOS(.v13), .iOS(.v16), .tvOS(.v16), .watchOS(.v9),
+        .macOS(.v10_15), .iOS(.v13), .tvOS(.v13), .watchOS(.v6),
     ],
     products: [
         .library(
diff --git a/Sources/OpenAPIRuntime/Conversion/Converter+Client.swift b/Sources/OpenAPIRuntime/Conversion/Converter+Client.swift
index 561febc2..300b0cb0 100644
--- a/Sources/OpenAPIRuntime/Conversion/Converter+Client.swift
+++ b/Sources/OpenAPIRuntime/Conversion/Converter+Client.swift
@@ -22,11 +22,13 @@ extension Converter {
     ) throws -> String {
         var renderedString = template
         for parameter in parameters {
-            renderedString.replace(
-                "{}",
-                with: parameter.description,
-                maxReplacements: 1
-            )
+            if let range = renderedString.range(of: "{}") {
+                renderedString = renderedString.replacingOccurrences(
+                    of: "{}",
+                    with: parameter.description,
+                    range: range
+                )
+            }
         }
         return renderedString
     }