diff --git a/2.1/Dockerfile b/2.1/Dockerfile
index 0cabedf05..9bcadc401 100644
--- a/2.1/Dockerfile
+++ b/2.1/Dockerfile
@@ -38,7 +38,7 @@ RUN set -ex \
 	&& gem update --system $RUBYGEMS_VERSION \
 	&& rm -r /usr/src/ruby
 
-ENV BUNDLER_VERSION 1.12.4
+ENV BUNDLER_VERSION 1.12.5
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.1/alpine/Dockerfile b/2.1/alpine/Dockerfile
index 629bcd706..32b502167 100644
--- a/2.1/alpine/Dockerfile
+++ b/2.1/alpine/Dockerfile
@@ -74,7 +74,7 @@ RUN set -ex \
 	&& gem update --system $RUBYGEMS_VERSION \
 	&& rm -r /usr/src/ruby
 
-ENV BUNDLER_VERSION 1.12.4
+ENV BUNDLER_VERSION 1.12.5
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.1/slim/Dockerfile b/2.1/slim/Dockerfile
index 7a0488f57..7328e59ba 100644
--- a/2.1/slim/Dockerfile
+++ b/2.1/slim/Dockerfile
@@ -60,7 +60,7 @@ RUN set -ex \
 	&& gem update --system $RUBYGEMS_VERSION \
 	&& rm -r /usr/src/ruby
 
-ENV BUNDLER_VERSION 1.12.4
+ENV BUNDLER_VERSION 1.12.5
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.2/Dockerfile b/2.2/Dockerfile
index 56d054775..faa786b5e 100644
--- a/2.2/Dockerfile
+++ b/2.2/Dockerfile
@@ -38,7 +38,7 @@ RUN set -ex \
 	&& gem update --system $RUBYGEMS_VERSION \
 	&& rm -r /usr/src/ruby
 
-ENV BUNDLER_VERSION 1.12.4
+ENV BUNDLER_VERSION 1.12.5
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.2/alpine/Dockerfile b/2.2/alpine/Dockerfile
index 1448f9244..3dfbb0953 100644
--- a/2.2/alpine/Dockerfile
+++ b/2.2/alpine/Dockerfile
@@ -74,7 +74,7 @@ RUN set -ex \
 	&& gem update --system $RUBYGEMS_VERSION \
 	&& rm -r /usr/src/ruby
 
-ENV BUNDLER_VERSION 1.12.4
+ENV BUNDLER_VERSION 1.12.5
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.2/slim/Dockerfile b/2.2/slim/Dockerfile
index 2176a21ab..54e39c1c2 100644
--- a/2.2/slim/Dockerfile
+++ b/2.2/slim/Dockerfile
@@ -60,7 +60,7 @@ RUN set -ex \
 	&& gem update --system $RUBYGEMS_VERSION \
 	&& rm -r /usr/src/ruby
 
-ENV BUNDLER_VERSION 1.12.4
+ENV BUNDLER_VERSION 1.12.5
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.3/Dockerfile b/2.3/Dockerfile
index 2320f7f49..6bea2bff2 100644
--- a/2.3/Dockerfile
+++ b/2.3/Dockerfile
@@ -38,7 +38,7 @@ RUN set -ex \
 	&& gem update --system $RUBYGEMS_VERSION \
 	&& rm -r /usr/src/ruby
 
-ENV BUNDLER_VERSION 1.12.4
+ENV BUNDLER_VERSION 1.12.5
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.3/alpine/Dockerfile b/2.3/alpine/Dockerfile
index cd935266c..a03935847 100644
--- a/2.3/alpine/Dockerfile
+++ b/2.3/alpine/Dockerfile
@@ -74,7 +74,7 @@ RUN set -ex \
 	&& gem update --system $RUBYGEMS_VERSION \
 	&& rm -r /usr/src/ruby
 
-ENV BUNDLER_VERSION 1.12.4
+ENV BUNDLER_VERSION 1.12.5
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.3/slim/Dockerfile b/2.3/slim/Dockerfile
index 37e9816e9..7394a2af6 100644
--- a/2.3/slim/Dockerfile
+++ b/2.3/slim/Dockerfile
@@ -60,7 +60,7 @@ RUN set -ex \
 	&& gem update --system $RUBYGEMS_VERSION \
 	&& rm -r /usr/src/ruby
 
-ENV BUNDLER_VERSION 1.12.4
+ENV BUNDLER_VERSION 1.12.5
 
 RUN gem install bundler --version "$BUNDLER_VERSION"