diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ec742dd..0f01d7d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -25,7 +25,7 @@ jobs:
     steps:
       - uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: 15.3
+          xcode-version: '16.0-beta'
       - uses: actions/checkout@v4
       - name: SPM tests
         run: make test
diff --git a/SourceMapper.xcodeproj/project.pbxproj b/SourceMapper.xcodeproj/project.pbxproj
index 099b64e..7f64ab8 100644
--- a/SourceMapper.xcodeproj/project.pbxproj
+++ b/SourceMapper.xcodeproj/project.pbxproj
@@ -384,7 +384,7 @@
 				MTL_FAST_MATH = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 			};
 			name = Debug;
 		};
@@ -436,7 +436,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 			};
 			name = Release;
 		};
@@ -461,7 +461,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "$(inherited)";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGET_NAME = SourceMapper;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
@@ -489,7 +489,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "$(inherited)";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGET_NAME = SourceMapper;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
@@ -520,6 +520,7 @@
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "$(inherited) SWIFT_PACKAGE DEBUG";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_STRICT_CONCURRENCY = complete;
+				SWIFT_VERSION = 6.0;
 				USE_HEADERMAP = NO;
 			};
 			name = Debug;
@@ -542,7 +543,7 @@
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "$(inherited)";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGET_NAME = SourceMapperTests;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
@@ -567,7 +568,7 @@
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "$(inherited)";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TARGET_NAME = SourceMapperTests;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				WATCHOS_DEPLOYMENT_TARGET = 2.0;
@@ -595,6 +596,7 @@
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "$(inherited) SWIFT_PACKAGE";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				SWIFT_STRICT_CONCURRENCY = complete;
+				SWIFT_VERSION = 6.0;
 				USE_HEADERMAP = NO;
 			};
 			name = Release;
diff --git a/Tests/SourceMapperTests/TestHelpers.swift b/Tests/SourceMapperTests/TestHelpers.swift
index 6432693..1fab0be 100644
--- a/Tests/SourceMapperTests/TestHelpers.swift
+++ b/Tests/SourceMapperTests/TestHelpers.swift
@@ -14,7 +14,7 @@ extension SourceMap {
         try self.init(try Data(contentsOf: url))
     }
 
-    static let fixturesURL = URL(fileURLWithPath: #file)
+    static let fixturesURL = URL(fileURLWithPath: #filePath)
         .deletingLastPathComponent()
         .appendingPathComponent("Fixtures")