diff --git a/bin/update-api-dummy b/bin/update-api-dummy
index 24c66d32..a27f3621 100755
--- a/bin/update-api-dummy
+++ b/bin/update-api-dummy
@@ -12,7 +12,7 @@ currentCommitID=$(cat docker-compose.yaml | yq '.services["api-dummy"].image|spl
 
 checkoutDir=$(mktemp -d)
 git clone --filter=blob:none --no-checkout --single-branch --branch $apiDummyBranch $apiDummyRepo $checkoutDir 2>/dev/null
-latestCommitID=$(git -C $checkoutDir log -1 --pretty="%H" $currentCommitID..$apiDummyBranch)
+latestCommitID=$(git -C $checkoutDir log -1 --pretty="%H" $currentCommitID^..$apiDummyBranch)
 rm -Rf $checkoutDir
 
 echo Image name: $imageName