diff --git a/Dockerfile b/Dockerfile
index 8d98746..1d3baad 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 ARG BASE_IMAGE=google/cloud-sdk:latest
 FROM $BASE_IMAGE
 
-RUN apk add -U --no-cache openssl jq
+RUN apk add -U --no-cache openssl jq gnupg
 
 # download and install kubectl
 ARG KUBECTL_VERSION