diff --git a/.github/workflows/check-package-diff.yml b/.github/workflows/check-package-diff.yml
new file mode 100644
index 00000000000..fd2c7a50fa0
--- /dev/null
+++ b/.github/workflows/check-package-diff.yml
@@ -0,0 +1,24 @@
+# We want to ensure that the Package.swift and Package@swift-5.9.swift are in sync.
+
+name: Check Package.swift Diff
+
+on:
+  push:
+    branches:
+      - main
+
+  pull_request:
+    paths:
+      - ".github/workflows/check-package-diff.yml"
+      - "Package*.swift"
+      - "Makefile"
+      - "Utils/expected_package_diff.patch"
+
+jobs:
+  check:
+    name: Check Package.swift Diff
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check Package.swift Diff
+        run: make check-package-diff
diff --git a/.gitignore b/.gitignore
index cb4b4598ee6..2fd2fc5c3ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -104,3 +104,5 @@ Sentry-Dynamic-WithARM64e.xcframework*
 SentrySwiftUI.xcframework*
 Sentry-WithoutUIKitOrAppKit.xcframework*
 Sentry-WithoutUIKitOrAppKit-WithARM64e.xcframework*
+
+current_package_diff.patch
diff --git a/Makefile b/Makefile
index 8c33656a39a..f5a51a5a658 100644
--- a/Makefile
+++ b/Makefile
@@ -183,3 +183,18 @@ xcode-ci:
 	xcodegen --spec Samples/watchOS-Swift/watchOS-Swift.yml
 	xcodegen --spec TestSamples/SwiftUITestSample/SwiftUITestSample.yml
 	xcodegen --spec TestSamples/SwiftUICrashTest/SwiftUICrashTest.yml
+
+.PHONY: check-package-diff update-package-diff
+# Diff will return an error if the files are different, so we need to ignore it with `|| true`.
+check-package-diff:
+	diff Package.swift Package@swift-5.9.swift > current_package_diff.patch || true
+	@if diff ./Utils/expected_package_diff.patch current_package_diff.patch > /dev/null 2>&1; then \
+		echo "--> Package diff check passed - no changes detected"; \
+	else \
+		echo "--> Package diff check failed - changes detected! Make sure to run \"make update-package-diff\" to update the expected diff."; \
+		exit 1; \
+	fi
+
+# Diff will return an error if the files are different, so we need to ignore it with `|| true`.
+update-package-diff:
+	diff Package.swift Package@swift-5.9.swift > ./Utils/expected_package_diff.patch || true
diff --git a/Utils/expected_package_diff.patch b/Utils/expected_package_diff.patch
new file mode 100644
index 00000000000..d41c2c2886b
--- /dev/null
+++ b/Utils/expected_package_diff.patch
@@ -0,0 +1,25 @@
+1,2c1,5
+< // swift-tools-version:5.3
+< #if canImport(Darwin)   
+---
+> // swift-tools-version:5.9
+> // This Package.swift for Swift 5.9 (and newer) fixes an issue on Xcode 26 when linking `SentrySwiftUI`.
+> // Don't remove this comment.
+> 
+> #if canImport(Darwin)
+15d17
+<     .library(name: "Sentry-Dynamic-WithARM64e", targets: ["Sentry-Dynamic-WithARM64e"]),
+39a42,44
+>         swiftSettings: [
+>             .interoperabilityMode(.Cxx, .when(platforms: [.visionOS]))
+>         ],
+53c58
+< if let env = env, String(cString: env, encoding: .utf8) == "1" {
+---
+> if let env = env, String(cString: env) == "1" {
+84a90
+>             publicHeadersPath: "",
+100c106
+<     platforms: [.iOS(.v11), .macOS(.v10_13), .tvOS(.v11), .watchOS(.v4)],
+---
+>     platforms: [.iOS(.v11), .macOS(.v10_13), .tvOS(.v11), .watchOS(.v4), .visionOS(.v1)],