diff --git a/tests/containers/ruby/Dockerfile b/tests/containers/ruby/Dockerfile
index ace1b626e..0279871e2 100644
--- a/tests/containers/ruby/Dockerfile
+++ b/tests/containers/ruby/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.6
+FROM ruby:2.6.7
 
 WORKDIR /app
 ADD fibonacci.rb /app