diff --git a/Makefile b/Makefile
index 350e04f8c9db..17e2b7fe4dfd 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 PLATFORM_IOS = iOS Simulator,name=iPhone 11 Pro Max
 PLATFORM_MACOS = macOS
+PLATFORM_MAC_CATALYST = macOS,variant=Mac Catalyst
 PLATFORM_TVOS = tvOS Simulator,name=Apple TV
 PLATFORM_WATCHOS = watchOS Simulator,name=Apple Watch Series 7 (45mm)
 
@@ -9,7 +10,7 @@ test-all: test-library-debug test-library-release test-examples
 
 test-library-debug:
 	for scheme in Dependencies ComposableArchitecture; do \
-	  for platform in "$(PLATFORM_WATCHOS)" "$(PLATFORM_IOS)" "$(PLATFORM_MACOS)" "$(PLATFORM_TVOS)"; do \
+	  for platform in "$(PLATFORM_IOS)" "$(PLATFORM_MACOS)" "$(PLATFORM_MAC_CATALYST)" "$(PLATFORM_TVOS)" "$(PLATFORM_WATCHOS)"; do \
 			xcodebuild test \
 				-workspace ComposableArchitecture.xcworkspace \
 				-scheme $$scheme \
@@ -19,7 +20,7 @@ test-library-debug:
 
 test-library-release:
 	for scheme in Dependencies ComposableArchitecture; do \
-	  for platform in "$(PLATFORM_WATCHOS)" "$(PLATFORM_IOS)" "$(PLATFORM_MACOS)" "$(PLATFORM_TVOS)"; do \
+	  for platform in "$(PLATFORM_IOS)" "$(PLATFORM_MACOS)" "$(PLATFORM_MAC_CATALYST)" "$(PLATFORM_TVOS)" "$(PLATFORM_WATCHOS)"; do \
 			xcodebuild test \
 				-configuration release \
 				-workspace ComposableArchitecture.xcworkspace \
diff --git a/Sources/Dependencies/Dependencies/OpenURL.swift b/Sources/Dependencies/Dependencies/OpenURL.swift
index 9d961177c692..ff064f6d7427 100644
--- a/Sources/Dependencies/Dependencies/OpenURL.swift
+++ b/Sources/Dependencies/Dependencies/OpenURL.swift
@@ -22,7 +22,7 @@ private enum OpenURLKey: DependencyKey {
   static let liveValue = OpenURLEffect { url in
     let stream = AsyncStream<Bool> { continuation in
       let task = Task { @MainActor in
-        #if canImport(AppKit)
+        #if canImport(AppKit) && !targetEnvironment(macCatalyst)
           NSWorkspace.shared.open(url, configuration: .init()) { app, error in
             continuation.yield(app != nil && error == nil)
             continuation.finish()