diff --git a/2.4/Dockerfile b/2.4/Dockerfile
index 9e7de3567..beed0c1d9 100644
--- a/2.4/Dockerfile
+++ b/2.4/Dockerfile
@@ -59,7 +59,7 @@ RUN set -ex \
 	\
 	&& gem update --system "$RUBYGEMS_VERSION"
 
-ENV BUNDLER_VERSION 1.15.2
+ENV BUNDLER_VERSION 1.15.3
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.4/alpine/Dockerfile b/2.4/alpine/Dockerfile
index 29f0236f8..d6b1bee1d 100644
--- a/2.4/alpine/Dockerfile
+++ b/2.4/alpine/Dockerfile
@@ -95,7 +95,7 @@ RUN set -ex \
 	\
 	&& gem update --system "$RUBYGEMS_VERSION"
 
-ENV BUNDLER_VERSION 1.15.2
+ENV BUNDLER_VERSION 1.15.3
 
 RUN gem install bundler --version "$BUNDLER_VERSION"
 
diff --git a/2.4/slim/Dockerfile b/2.4/slim/Dockerfile
index bc4e241f4..c9ef21101 100644
--- a/2.4/slim/Dockerfile
+++ b/2.4/slim/Dockerfile
@@ -82,7 +82,7 @@ RUN set -ex \
 	\
 	&& gem update --system "$RUBYGEMS_VERSION"
 
-ENV BUNDLER_VERSION 1.15.2
+ENV BUNDLER_VERSION 1.15.3
 
 RUN gem install bundler --version "$BUNDLER_VERSION"