diff --git a/Dockerfile b/Dockerfile
index c7ae01c..3d624b1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ RUN mkdir -p /app/pkg
 
 WORKDIR /app/code
 
-ARG VERSION=v1.20.1
+ARG VERSION=v1.21.0
 
 # https://pythonspeed.com/articles/activate-virtualenv-dockerfile/
 RUN virtualenv -p python3 /app/code/env