diff --git a/2.2/Dockerfile b/2.2/Dockerfile
index b677b877c..a2c549c6b 100644
--- a/2.2/Dockerfile
+++ b/2.2/Dockerfile
@@ -3,7 +3,7 @@ FROM buildpack-deps:jessie
 RUN apt-get update && apt-get install -y curl procps && rm -rf /var/lib/apt/lists/*
 
 ENV RUBY_MAJOR 2.2
-ENV RUBY_VERSION 2.2.0-preview2
+ENV RUBY_VERSION 2.2.0-rc1
 
 # some of ruby's build scripts are written in ruby
 # we purge this later to make sure our final image uses what we just built
diff --git a/2.2/onbuild/Dockerfile b/2.2/onbuild/Dockerfile
index f945fab3b..84fed0bf7 100644
--- a/2.2/onbuild/Dockerfile
+++ b/2.2/onbuild/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.2.0-preview2
+FROM ruby:2.2.0-rc1
 
 # throw errors if Gemfile has been modified since Gemfile.lock
 RUN bundle config --global frozen 1
diff --git a/2.2/wheezy/Dockerfile b/2.2/wheezy/Dockerfile
index d41c9ffcc..8019a6ff0 100644
--- a/2.2/wheezy/Dockerfile
+++ b/2.2/wheezy/Dockerfile
@@ -3,7 +3,7 @@ FROM buildpack-deps:wheezy
 RUN apt-get update && apt-get install -y curl procps && rm -rf /var/lib/apt/lists/*
 
 ENV RUBY_MAJOR 2.2
-ENV RUBY_VERSION 2.2.0-preview2
+ENV RUBY_VERSION 2.2.0-rc1
 
 # some of ruby's build scripts are written in ruby
 # we purge this later to make sure our final image uses what we just built
diff --git a/update.sh b/update.sh
index 36fe886f3..3c4d4d60d 100755
--- a/update.sh
+++ b/update.sh
@@ -17,8 +17,8 @@ for version in "${versions[@]}"; do
 		| sort -V | tail -1)"
 	(
 		set -x
-		sed -ri 's/^(ENV RUBY_MAJOR) .*/\1 '"$version"'/' "$version/Dockerfile"
-		sed -ri 's/^(ENV RUBY_VERSION) .*/\1 '"$fullVersion"'/' "$version/Dockerfile"
+		sed -ri 's/^(ENV RUBY_MAJOR) .*/\1 '"$version"'/' "$version/"{,wheezy/}Dockerfile
+		sed -ri 's/^(ENV RUBY_VERSION) .*/\1 '"$fullVersion"'/' "$version/"{,wheezy/}Dockerfile
 		sed -ri 's/^(FROM ruby):.*/\1:'"$fullVersion"'/' "$version/"*"/Dockerfile"
 	)
 done