diff --git a/2.5/alpine3.7/Dockerfile b/2.5/alpine3.7/Dockerfile
index d80296285..c21be0605 100644
--- a/2.5/alpine3.7/Dockerfile
+++ b/2.5/alpine3.7/Dockerfile
@@ -11,7 +11,7 @@ ENV RUBY_MAJOR 2.5
 ENV RUBY_VERSION 2.5.1
 ENV RUBY_DOWNLOAD_SHA256 886ac5eed41e3b5fc699be837b0087a6a5a3d10f464087560d2d21b3e71b754d
 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/2.5/stretch/Dockerfile b/2.5/stretch/Dockerfile
index 14d8198af..5fa1f0a74 100644
--- a/2.5/stretch/Dockerfile
+++ b/2.5/stretch/Dockerfile
@@ -11,7 +11,7 @@ ENV RUBY_MAJOR 2.5
 ENV RUBY_VERSION 2.5.1
 ENV RUBY_DOWNLOAD_SHA256 886ac5eed41e3b5fc699be837b0087a6a5a3d10f464087560d2d21b3e71b754d
 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/2.5/stretch/slim/Dockerfile b/2.5/stretch/slim/Dockerfile
index 8a71a2e25..e853a6f76 100644
--- a/2.5/stretch/slim/Dockerfile
+++ b/2.5/stretch/slim/Dockerfile
@@ -23,7 +23,7 @@ ENV RUBY_MAJOR 2.5
 ENV RUBY_VERSION 2.5.1
 ENV RUBY_DOWNLOAD_SHA256 886ac5eed41e3b5fc699be837b0087a6a5a3d10f464087560d2d21b3e71b754d
 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