diff --git a/2.2/alpine3.4/Dockerfile b/2.2/alpine3.4/Dockerfile
index a68b9b7c1..db5d2c7a3 100644
--- a/2.2/alpine3.4/Dockerfile
+++ b/2.2/alpine3.4/Dockerfile
@@ -10,7 +10,7 @@ RUN mkdir -p /usr/local/etc \
 ENV RUBY_MAJOR 2.2
 ENV RUBY_VERSION 2.2.7
 ENV RUBY_DOWNLOAD_SHA256 234c8aee6543da9efd67008e6e7ee740d41ed57a52e797f65043c3b5ec3bcb53
-ENV RUBYGEMS_VERSION 2.6.12
+ENV RUBYGEMS_VERSION 2.6.13
 
 # some of ruby's build scripts are written in ruby
 #   we purge system ruby later to make sure our final image uses what we just built
diff --git a/2.2/jessie/Dockerfile b/2.2/jessie/Dockerfile
index da59cfec7..edbc9a707 100644
--- a/2.2/jessie/Dockerfile
+++ b/2.2/jessie/Dockerfile
@@ -10,7 +10,7 @@ RUN mkdir -p /usr/local/etc \
 ENV RUBY_MAJOR 2.2
 ENV RUBY_VERSION 2.2.7
 ENV RUBY_DOWNLOAD_SHA256 234c8aee6543da9efd67008e6e7ee740d41ed57a52e797f65043c3b5ec3bcb53
-ENV RUBYGEMS_VERSION 2.6.12
+ENV RUBYGEMS_VERSION 2.6.13
 
 # some of ruby's build scripts are written in ruby
 #   we purge system ruby later to make sure our final image uses what we just built
diff --git a/2.2/jessie/slim/Dockerfile b/2.2/jessie/slim/Dockerfile
index 5b8bea228..71d144c12 100644
--- a/2.2/jessie/slim/Dockerfile
+++ b/2.2/jessie/slim/Dockerfile
@@ -22,7 +22,7 @@ RUN mkdir -p /usr/local/etc \
 ENV RUBY_MAJOR 2.2
 ENV RUBY_VERSION 2.2.7
 ENV RUBY_DOWNLOAD_SHA256 234c8aee6543da9efd67008e6e7ee740d41ed57a52e797f65043c3b5ec3bcb53
-ENV RUBYGEMS_VERSION 2.6.12
+ENV RUBYGEMS_VERSION 2.6.13
 
 # some of ruby's build scripts are written in ruby
 #   we purge system ruby later to make sure our final image uses what we just built