diff --git a/Graph.xcodeproj/project.pbxproj b/Graph.xcodeproj/project.pbxproj
index 4763476f..63945508 100644
--- a/Graph.xcodeproj/project.pbxproj
+++ b/Graph.xcodeproj/project.pbxproj
@@ -1075,7 +1075,7 @@
 				PRODUCT_NAME = Graph;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -1094,7 +1094,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.cosmicmind.Graph;
 				PRODUCT_NAME = Graph;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -1111,7 +1111,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -1127,7 +1127,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = io.cosmicmind.GraphTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -1151,7 +1151,7 @@
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -1174,7 +1174,7 @@
 				PRODUCT_NAME = Graph;
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -1192,7 +1192,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -1209,7 +1209,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "io.cosmicmind.Graph-macOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};