diff --git a/2.4/alpine3.6/Dockerfile b/2.4/alpine3.6/Dockerfile
index 8d611d848..416e5fd3f 100644
--- a/2.4/alpine3.6/Dockerfile
+++ b/2.4/alpine3.6/Dockerfile
@@ -11,7 +11,7 @@ ENV RUBY_MAJOR 2.4
 ENV RUBY_VERSION 2.4.4
 ENV RUBY_DOWNLOAD_SHA256 1d0034071d675193ca769f64c91827e5f54cb3a7962316a41d5217c7bc6949f0
 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/2.4/alpine3.7/Dockerfile b/2.4/alpine3.7/Dockerfile
index fbfe011b2..5f7dbeb76 100644
--- a/2.4/alpine3.7/Dockerfile
+++ b/2.4/alpine3.7/Dockerfile
@@ -11,7 +11,7 @@ ENV RUBY_MAJOR 2.4
 ENV RUBY_VERSION 2.4.4
 ENV RUBY_DOWNLOAD_SHA256 1d0034071d675193ca769f64c91827e5f54cb3a7962316a41d5217c7bc6949f0
 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/2.4/jessie/Dockerfile b/2.4/jessie/Dockerfile
index 7e9bfcb38..51a7581f7 100644
--- a/2.4/jessie/Dockerfile
+++ b/2.4/jessie/Dockerfile
@@ -11,7 +11,7 @@ ENV RUBY_MAJOR 2.4
 ENV RUBY_VERSION 2.4.4
 ENV RUBY_DOWNLOAD_SHA256 1d0034071d675193ca769f64c91827e5f54cb3a7962316a41d5217c7bc6949f0
 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/2.4/jessie/slim/Dockerfile b/2.4/jessie/slim/Dockerfile
index a43e108f0..5465682f3 100644
--- a/2.4/jessie/slim/Dockerfile
+++ b/2.4/jessie/slim/Dockerfile
@@ -23,7 +23,7 @@ ENV RUBY_MAJOR 2.4
 ENV RUBY_VERSION 2.4.4
 ENV RUBY_DOWNLOAD_SHA256 1d0034071d675193ca769f64c91827e5f54cb3a7962316a41d5217c7bc6949f0
 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/2.4/stretch/Dockerfile b/2.4/stretch/Dockerfile
index 9b10aa09b..4740a5fe4 100644
--- a/2.4/stretch/Dockerfile
+++ b/2.4/stretch/Dockerfile
@@ -11,7 +11,7 @@ ENV RUBY_MAJOR 2.4
 ENV RUBY_VERSION 2.4.4
 ENV RUBY_DOWNLOAD_SHA256 1d0034071d675193ca769f64c91827e5f54cb3a7962316a41d5217c7bc6949f0
 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/2.4/stretch/slim/Dockerfile b/2.4/stretch/slim/Dockerfile
index 1abac02fd..f17df60e6 100644
--- a/2.4/stretch/slim/Dockerfile
+++ b/2.4/stretch/slim/Dockerfile
@@ -23,7 +23,7 @@ ENV RUBY_MAJOR 2.4
 ENV RUBY_VERSION 2.4.4
 ENV RUBY_DOWNLOAD_SHA256 1d0034071d675193ca769f64c91827e5f54cb3a7962316a41d5217c7bc6949f0
 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