diff --git a/modules/openapi-generator/src/main/resources/swift5/libraries/urlsession/URLSessionImplementations.mustache b/modules/openapi-generator/src/main/resources/swift5/libraries/urlsession/URLSessionImplementations.mustache
index 56637c3ce282..0c8cc2863cd7 100644
--- a/modules/openapi-generator/src/main/resources/swift5/libraries/urlsession/URLSessionImplementations.mustache
+++ b/modules/openapi-generator/src/main/resources/swift5/libraries/urlsession/URLSessionImplementations.mustache
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 {{#nonPublicApi}}internal{{/nonPublicApi}}{{^nonPublicApi}}public{{/nonPublicApi}} protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/anycodableLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/anycodableLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/anycodableLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/anycodableLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/asyncAwaitLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/asyncAwaitLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/asyncAwaitLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/asyncAwaitLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/deprecated/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/deprecated/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/deprecated/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/deprecated/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/frozenEnums/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/frozenEnums/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/frozenEnums/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/frozenEnums/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index f5313020c6f4..ce6e6927f0b7 100644
--- a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 internal protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/oneOf/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/oneOf/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/oneOf/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/oneOf/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/urlsessionLibrary/Sources/PetstoreClient/URLSessionImplementations.swift b/samples/client/petstore/swift5/urlsessionLibrary/Sources/PetstoreClient/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/urlsessionLibrary/Sources/PetstoreClient/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/urlsessionLibrary/Sources/PetstoreClient/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/validation/Package.resolved b/samples/client/petstore/swift5/validation/Package.resolved
new file mode 100644
index 000000000000..ad0d042394e8
--- /dev/null
+++ b/samples/client/petstore/swift5/validation/Package.resolved
@@ -0,0 +1,16 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "AnyCodable",
+        "repositoryURL": "https://github.com/Flight-School/AnyCodable",
+        "state": {
+          "branch": null,
+          "revision": "862808b2070cd908cb04f9aafe7de83d35f81b05",
+          "version": "0.6.7"
+        }
+      }
+    ]
+  },
+  "version": 1
+}
diff --git a/samples/client/petstore/swift5/validation/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/validation/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/validation/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/validation/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }
diff --git a/samples/client/petstore/swift5/x-swift-hashable/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/x-swift-hashable/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
index e91fef04ceaa..ec201fa09954 100644
--- a/samples/client/petstore/swift5/x-swift-hashable/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+++ b/samples/client/petstore/swift5/x-swift-hashable/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -8,6 +8,9 @@ import Foundation
 #if !os(macOS)
 import MobileCoreServices
 #endif
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 
 public protocol URLSessionProtocol {
     func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
@@ -560,9 +563,20 @@ private class FormDataEncoding: ParameterEncoding {
     func mimeType(for url: URL) -> String {
         let pathExtension = url.pathExtension
 
-        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
-                let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
-            return mimetype as String
+        if #available(iOS 15, macOS 11, *) {
+            #if canImport(UniformTypeIdentifiers)
+            if let utType = UTType(filenameExtension: pathExtension) {
+                return utType.preferredMIMEType ?? "application/octet-stream"
+            }
+            #else
+            return "application/octet-stream" 
+            #endif
+        } else {
+            if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue(),
+                    let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+            return "application/octet-stream"
         }
         return "application/octet-stream"
     }