diff --git a/2.4/alpine3.4/Dockerfile b/2.4/alpine3.4/Dockerfile
index fd7f3d760..a068e6a01 100644
--- a/2.4/alpine3.4/Dockerfile
+++ b/2.4/alpine3.4/Dockerfile
@@ -95,7 +95,7 @@ RUN set -ex \
 	\
 	&& gem update --system "$RUBYGEMS_VERSION"
 
-ENV BUNDLER_VERSION 1.15.3
+ENV BUNDLER_VERSION 1.15.4
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.4/alpine3.6/Dockerfile b/2.4/alpine3.6/Dockerfile
index c85f20967..0df670ae0 100644
--- a/2.4/alpine3.6/Dockerfile
+++ b/2.4/alpine3.6/Dockerfile
@@ -95,7 +95,7 @@ RUN set -ex \
 	\
 	&& gem update --system "$RUBYGEMS_VERSION"
 
-ENV BUNDLER_VERSION 1.15.3
+ENV BUNDLER_VERSION 1.15.4
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.4/jessie/Dockerfile b/2.4/jessie/Dockerfile
index beed0c1d9..5a341b550 100644
--- a/2.4/jessie/Dockerfile
+++ b/2.4/jessie/Dockerfile
@@ -59,7 +59,7 @@ RUN set -ex \
 	\
 	&& gem update --system "$RUBYGEMS_VERSION"
 
-ENV BUNDLER_VERSION 1.15.3
+ENV BUNDLER_VERSION 1.15.4
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.4/jessie/slim/Dockerfile b/2.4/jessie/slim/Dockerfile
index 815d33acb..754be6b68 100644
--- a/2.4/jessie/slim/Dockerfile
+++ b/2.4/jessie/slim/Dockerfile
@@ -85,7 +85,7 @@ RUN set -ex \
 	\
 	&& gem update --system "$RUBYGEMS_VERSION"
 
-ENV BUNDLER_VERSION 1.15.3
+ENV BUNDLER_VERSION 1.15.4
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.4/stretch/Dockerfile b/2.4/stretch/Dockerfile
index 7b1046695..c3ec4f6cd 100644
--- a/2.4/stretch/Dockerfile
+++ b/2.4/stretch/Dockerfile
@@ -59,7 +59,7 @@ RUN set -ex \
 	\
 	&& gem update --system "$RUBYGEMS_VERSION"
 
-ENV BUNDLER_VERSION 1.15.3
+ENV BUNDLER_VERSION 1.15.4
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.4/stretch/slim/Dockerfile b/2.4/stretch/slim/Dockerfile
index 908442235..9afa1258d 100644
--- a/2.4/stretch/slim/Dockerfile
+++ b/2.4/stretch/slim/Dockerfile
@@ -85,7 +85,7 @@ RUN set -ex \
 	\
 	&& gem update --system "$RUBYGEMS_VERSION"
 
-ENV BUNDLER_VERSION 1.15.3
+ENV BUNDLER_VERSION 1.15.4
 
 RUN gem install bundler --version "$BUNDLER_VERSION"