diff --git a/Dockerfile.ruby-2.2 b/Dockerfile.ruby-2.2
index 514d916..bba4ea2 100644
--- a/Dockerfile.ruby-2.2
+++ b/Dockerfile.ruby-2.2
@@ -1,4 +1,4 @@
-FROM ruby:2.3
+FROM ruby:2.2
 
 ENV PACKAGES "git-core" \
 	LC_ALL=en_US.UTF-8
diff --git a/Dockerfile.ruby-2.3 b/Dockerfile.ruby-2.3
index bba4ea2..514d916 100644
--- a/Dockerfile.ruby-2.3
+++ b/Dockerfile.ruby-2.3
@@ -1,4 +1,4 @@
-FROM ruby:2.2
+FROM ruby:2.3
 
 ENV PACKAGES "git-core" \
 	LC_ALL=en_US.UTF-8