diff --git a/scripts/gate-check-commit.sh b/scripts/gate-check-commit.sh
index 0b8b1dc6e5..a06d9fbcaf 100755
--- a/scripts/gate-check-commit.sh
+++ b/scripts/gate-check-commit.sh
@@ -62,9 +62,12 @@ if [[ "${ACTION}" =~ "upgrade" ]]; then
     # Set the source branch for upgrade tests
     # Be sure to change this whenever a new stable branch
     # is created.
+    # The branch prefix will also change from 'stable/' to 'unmaintained/'
+    # in the future, so determine the branch prefix dynamically
     UPGRADE_ACTION_ARRAY=(${ACTION//_/ })
     export UPGRADE_SOURCE_RELEASE=${UPGRADE_ACTION_ARRAY[1]:-'2023.2'}
-    export UPGRADE_SOURCE_BRANCH=${UPGRADE_SOURCE_BRANCH:-stable/$UPGRADE_SOURCE_RELEASE}
+    export UPGRADE_SOURCE_BRANCH_PREFIX=$(git branch -r --list 'origin/*' | grep $UPGRADE_SOURCE_RELEASE | sort | tail -n 1 | cut -d '/' -f 2)
+    export UPGRADE_SOURCE_BRANCH=${UPGRADE_SOURCE_BRANCH:-$UPGRADE_SOURCE_BRANCH_PREFIX/$UPGRADE_SOURCE_RELEASE}
 
     # Store the target SHA/branch
     export UPGRADE_TARGET_BRANCH=$(git rev-parse HEAD)