diff --git a/.github/workflows/godot_cpp_test.yml b/.github/workflows/godot_cpp_test.yml
index 57114dacfc20..e1c37bbc1e14 100644
--- a/.github/workflows/godot_cpp_test.yml
+++ b/.github/workflows/godot_cpp_test.yml
@@ -7,7 +7,7 @@ env:
   # Used for the cache key. Add version suffix to force clean build.
   GODOT_BASE_BRANCH: master
   # Used for the godot-cpp checkout.
-  GODOT_CPP_BRANCH: '4.2'
+  GODOT_CPP_BRANCH: '4.3'
 
 concurrency:
   group: ci-${{github.actor}}-${{github.head_ref || github.run_number}}-${{github.ref}}-cpp-tests
diff --git a/misc/extension_api_validation/4.3-stable.expected b/misc/extension_api_validation/4.3-stable.expected
new file mode 100644
index 000000000000..a2112d71f2d6
--- /dev/null
+++ b/misc/extension_api_validation/4.3-stable.expected
@@ -0,0 +1,9 @@
+This file contains the expected output of --validate-extension-api when run against the extension_api.json of the
+4.3-stable tag (the basename of this file).
+
+Only lines that start with "Validate extension JSON:" matter, everything else is considered a comment and ignored. They
+should instead be used to justify these changes and describe how users should work around these changes.
+
+Add new entries at the end of the file.
+
+## Changes between 4.3-stable and 4.4-stable