diff --git a/Dockerfile b/Dockerfile
index bd5de1b..895e805 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,6 +5,6 @@ RUN apk add -U --no-cache openssl
 
 # download and install kubectl
 ARG KUBECTL_VERSION
-ENV KUBECTL_VERSION ${CONT_IMG_VER:-v9.0.10}
+ENV KUBECTL_VERSION ${KUBECTL_VERSION:-v9.0.10}
 RUN curl -LO https://storage.googleapis.com/kubernetes-release/release/$KUBECTL_VERSION/bin/linux/amd64/kubectl -o /usr/bin/kubectl \
 	&& chmod +x /usr/bin/kubectl \