diff --git a/2.4/alpine3.6/Dockerfile b/2.4/alpine3.6/Dockerfile
index d6dc0462a..01c1f60b9 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 1.16.2
+ENV BUNDLER_VERSION 1.16.3
 
 # 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 4b0dd8205..31daa0eb2 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 1.16.2
+ENV BUNDLER_VERSION 1.16.3
 
 # 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 de82348f3..c602fa9a5 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 1.16.2
+ENV BUNDLER_VERSION 1.16.3
 
 # 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 92842cc51..b58ca9d77 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 1.16.2
+ENV BUNDLER_VERSION 1.16.3
 
 # 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 34899060d..d83d74574 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 1.16.2
+ENV BUNDLER_VERSION 1.16.3
 
 # 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 a2d97467d..f5cd12b32 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 1.16.2
+ENV BUNDLER_VERSION 1.16.3
 
 # 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