diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
new file mode 100644
index 00000000..63fed2a8
--- /dev/null
+++ b/.github/workflows/swift.yml
@@ -0,0 +1,70 @@
+name: Swift Build and Test
+on:
+  push:
+  pull_request:
+
+jobs:
+  macos-build:
+    name: Build and Test on macOS
+    runs-on: macos-15
+    steps:
+      - name: Select Xcode 16.3
+        run: |
+          XCODE_PATH=$(ls -d /Applications/Xcode_16.3*.app | head -n 1)
+          echo "Using Xcode at $XCODE_PATH"
+          sudo xcode-select -s "$XCODE_PATH/Contents/Developer"
+          xcodebuild -version
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Build
+        run: swift build --package-path Core
+      - name: Test
+        run: swift test --package-path Core
+
+  xcodebuild-test:
+    name: Xcodebuild test on macOS
+    runs-on: macos-15
+    steps:
+      - name: Select Xcode 16.3
+        run: |
+          XCODE_PATH=$(ls -d /Applications/Xcode_16.3*.app | head -n 1)
+          echo "Using Xcode at $XCODE_PATH"
+          sudo xcode-select -s "$XCODE_PATH/Contents/Developer"
+          xcodebuild -version
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Verify xcodebuild installation
+        run: xcodebuild -version
+      - name: List available schemes
+        run: xcodebuild -project azooKeyMac.xcodeproj -list
+      - name: Test building azooKeyMac (Release configuration)
+        run: |
+         xcodebuild \
+          -project azooKeyMac.xcodeproj \
+          -scheme azooKeyMac \
+          -configuration Release \
+          -destination 'generic/platform=macOS' \
+          CODE_SIGNING_ALLOWED=NO \
+          CODE_SIGNING_REQUIRED=NO \
+          CODE_SIGN_IDENTITY=""
+
+  swiftlint:
+    name: SwiftLint
+    runs-on: macos-15
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install SwiftLint
+        run: |
+          brew update
+          brew install swiftlint
+      - name: Check SwiftLint version
+        run: swiftlint version
+      - name: Run SwiftLint
+        run: |
+          swiftlint --fix --format
+          swiftlint --quiet --strict
+  
\ No newline at end of file
diff --git a/azooKeyMac.xcodeproj/project.pbxproj b/azooKeyMac.xcodeproj/project.pbxproj
index 53bbe3a1..a13c4692 100644
--- a/azooKeyMac.xcodeproj/project.pbxproj
+++ b/azooKeyMac.xcodeproj/project.pbxproj
@@ -420,7 +420,6 @@
 				SDKROOT = macosx;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SYMROOT = build;
 			};
 			name = Debug;
 		};
@@ -478,7 +477,6 @@
 				SDKROOT = macosx;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SYMROOT = build;
 			};
 			name = Release;
 		};
diff --git a/azooKeyMac/Extensions/KeychainHelper.swift b/azooKeyMac/Extensions/KeychainHelper.swift
index 59a36896..dbac537b 100644
--- a/azooKeyMac/Extensions/KeychainHelper.swift
+++ b/azooKeyMac/Extensions/KeychainHelper.swift
@@ -33,7 +33,7 @@ enum KeychainHelper {
         let status = SecItemCopyMatching(query as CFDictionary, &dataTypeRef)
 
         if status == errSecSuccess, let data = dataTypeRef as? Data {
-            return String(decoding: data, as: UTF8.self)
+            return String(bytes: data, encoding: .utf8)
         }
 
         return nil
diff --git a/azooKeyMac/InputController/OpenAIClient.swift b/azooKeyMac/InputController/OpenAIClient.swift
index 0012f6df..4554de49 100644
--- a/azooKeyMac/InputController/OpenAIClient.swift
+++ b/azooKeyMac/InputController/OpenAIClient.swift
@@ -271,7 +271,7 @@ enum OpenAIClient {
         }
 
         guard httpResponse.statusCode == 200 else {
-            let responseBody = String(decoding: data, as: UTF8.self)
+            let responseBody = String(bytes: data, encoding: .utf8) ?? "Body is not encoded in UTF-8"
             throw OpenAIError.invalidResponseStatus(code: httpResponse.statusCode, body: responseBody)
         }