diff --git a/hack/update-internal-modules.sh b/hack/update-internal-modules.sh
index bfda4de8bb1..61b988c3e26 100755
--- a/hack/update-internal-modules.sh
+++ b/hack/update-internal-modules.sh
@@ -26,6 +26,7 @@ source "${KUBE_ROOT}/hack/lib/init.sh"
 MODULES=(
     hack/tools
     staging/src/k8s.io/code-generator/examples
+    staging/src/k8s.io/kms/internal/plugins/mock
 )
 
 # Explicitly opt into go modules, even though we're inside a GOPATH directory