diff --git a/hooks/build b/hooks/build
index f5bdf77..6f6ac62 100644
--- a/hooks/build
+++ b/hooks/build
@@ -10,6 +10,6 @@ fi
 echo "Using $DOCKERFILE for build"
 
 docker build \
-        --build-arg SERVERLESS_VERSION=1.20.0 \
+        --build-arg SERVERLESS_VERSION=1.21.0 \
         -f $DOCKERFILE \
         -t $IMAGE_NAME .