diff --git a/Dockerfile b/Dockerfile
index 8ef92b0..0cbf2c6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 ARG RUBY_VERSION
-FROM ruby:${RUBY_VERSION}}
+FROM ruby:${RUBY_VERSION}
 
 LABEL org.opencontainers.image.authors="hanjo@bunix.de"