diff --git a/2.1/Dockerfile b/2.1/Dockerfile
index 4f721eb78..08ff90175 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 1.11.2
+ENV BUNDLER_VERSION 1.12.0
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.1/alpine/Dockerfile b/2.1/alpine/Dockerfile
index f5272b6d6..eb241c58a 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 1.11.2
+ENV BUNDLER_VERSION 1.12.0
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.1/slim/Dockerfile b/2.1/slim/Dockerfile
index 99ca04b9b..2b01f5fb8 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 1.11.2
+ENV BUNDLER_VERSION 1.12.0
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.2/Dockerfile b/2.2/Dockerfile
index 111f3d761..49d8000c8 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 1.11.2
+ENV BUNDLER_VERSION 1.12.0
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.2/alpine/Dockerfile b/2.2/alpine/Dockerfile
index 1513542d4..d30c0dc0a 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 1.11.2
+ENV BUNDLER_VERSION 1.12.0
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.2/slim/Dockerfile b/2.2/slim/Dockerfile
index 74d7a5413..06b51b9af 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 1.11.2
+ENV BUNDLER_VERSION 1.12.0
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.3/Dockerfile b/2.3/Dockerfile
index 00518eb80..243006380 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 1.11.2
+ENV BUNDLER_VERSION 1.12.0
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.3/alpine/Dockerfile b/2.3/alpine/Dockerfile
index fe08e94ce..c1bc7e91a 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 1.11.2
+ENV BUNDLER_VERSION 1.12.0
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.3/slim/Dockerfile b/2.3/slim/Dockerfile
index 8b4c3e04d..5b37a274c 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 1.11.2
+ENV BUNDLER_VERSION 1.12.0
 
 RUN gem install bundler --version "$BUNDLER_VERSION"