diff --git a/2.3/alpine3.7/Dockerfile b/2.3/alpine3.7/Dockerfile
index 2a9c19b2b..9b2db8ba0 100644
--- a/2.3/alpine3.7/Dockerfile
+++ b/2.3/alpine3.7/Dockerfile
@@ -11,7 +11,7 @@ ENV RUBY_MAJOR 2.3
 ENV RUBY_VERSION 2.3.7
 ENV RUBY_DOWNLOAD_SHA256 c61f8f2b9d3ffff5567e186421fa191f0d5e7c2b189b426bb84498825d548edb
 ENV RUBYGEMS_VERSION 2.7.7
-ENV BUNDLER_VERSION 1.16.4
+ENV BUNDLER_VERSION 1.16.5
 
 # 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/2.3/alpine3.8/Dockerfile b/2.3/alpine3.8/Dockerfile
index ec22bbe5f..256e54950 100644
--- a/2.3/alpine3.8/Dockerfile
+++ b/2.3/alpine3.8/Dockerfile
@@ -11,7 +11,7 @@ ENV RUBY_MAJOR 2.3
 ENV RUBY_VERSION 2.3.7
 ENV RUBY_DOWNLOAD_SHA256 c61f8f2b9d3ffff5567e186421fa191f0d5e7c2b189b426bb84498825d548edb
 ENV RUBYGEMS_VERSION 2.7.7
-ENV BUNDLER_VERSION 1.16.4
+ENV BUNDLER_VERSION 1.16.5
 
 # 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/2.3/jessie/Dockerfile b/2.3/jessie/Dockerfile
index f2daf6c54..3d2f5bb84 100644
--- a/2.3/jessie/Dockerfile
+++ b/2.3/jessie/Dockerfile
@@ -11,7 +11,7 @@ ENV RUBY_MAJOR 2.3
 ENV RUBY_VERSION 2.3.7
 ENV RUBY_DOWNLOAD_SHA256 c61f8f2b9d3ffff5567e186421fa191f0d5e7c2b189b426bb84498825d548edb
 ENV RUBYGEMS_VERSION 2.7.7
-ENV BUNDLER_VERSION 1.16.4
+ENV BUNDLER_VERSION 1.16.5
 
 # 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/2.3/jessie/slim/Dockerfile b/2.3/jessie/slim/Dockerfile
index 7ee637a06..ae2344c4e 100644
--- a/2.3/jessie/slim/Dockerfile
+++ b/2.3/jessie/slim/Dockerfile
@@ -23,7 +23,7 @@ ENV RUBY_MAJOR 2.3
 ENV RUBY_VERSION 2.3.7
 ENV RUBY_DOWNLOAD_SHA256 c61f8f2b9d3ffff5567e186421fa191f0d5e7c2b189b426bb84498825d548edb
 ENV RUBYGEMS_VERSION 2.7.7
-ENV BUNDLER_VERSION 1.16.4
+ENV BUNDLER_VERSION 1.16.5
 
 # 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/2.3/stretch/Dockerfile b/2.3/stretch/Dockerfile
index 070c9a9dc..4d6cb6d35 100644
--- a/2.3/stretch/Dockerfile
+++ b/2.3/stretch/Dockerfile
@@ -11,7 +11,7 @@ ENV RUBY_MAJOR 2.3
 ENV RUBY_VERSION 2.3.7
 ENV RUBY_DOWNLOAD_SHA256 c61f8f2b9d3ffff5567e186421fa191f0d5e7c2b189b426bb84498825d548edb
 ENV RUBYGEMS_VERSION 2.7.7
-ENV BUNDLER_VERSION 1.16.4
+ENV BUNDLER_VERSION 1.16.5
 
 # 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/2.3/stretch/slim/Dockerfile b/2.3/stretch/slim/Dockerfile
index 4fbfff1b7..23104c67a 100644
--- a/2.3/stretch/slim/Dockerfile
+++ b/2.3/stretch/slim/Dockerfile
@@ -23,7 +23,7 @@ ENV RUBY_MAJOR 2.3
 ENV RUBY_VERSION 2.3.7
 ENV RUBY_DOWNLOAD_SHA256 c61f8f2b9d3ffff5567e186421fa191f0d5e7c2b189b426bb84498825d548edb
 ENV RUBYGEMS_VERSION 2.7.7
-ENV BUNDLER_VERSION 1.16.4
+ENV BUNDLER_VERSION 1.16.5
 
 # 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