diff --git a/1.9/Dockerfile b/1.9/Dockerfile
index 9045b41..85edb4e 100644
--- a/1.9/Dockerfile
+++ b/1.9/Dockerfile
@@ -55,7 +55,7 @@ ENV BUNDLE_SILENCE_ROOT_WARNING 1
 RUN echo 'gem: --no-rdoc --no-ri --no-document' > /root/.gemrc \
   && ssh-keyscan -H github.com >> /etc/ssh/ssh_known_hosts \
   && gem update --system 2.6.1 \
-  && gem install bundler --version 1.16.2 \
+  && gem install bundler --version 1.15.1 \
   && bundle config --global jobs 7 \
   && bundle config git.allow_insecure true \
   && bundle config --global build.nokogiri --use-system-libraries
diff --git a/2.2/Dockerfile b/2.2/Dockerfile
index 7b5915c..7d222ef 100644
--- a/2.2/Dockerfile
+++ b/2.2/Dockerfile
@@ -62,7 +62,7 @@ ENV BUNDLE_SILENCE_ROOT_WARNING 1
 RUN echo 'gem: --no-rdoc --no-ri --no-document' > /root/.gemrc \
   && ssh-keyscan -H github.com >> /etc/ssh/ssh_known_hosts \
   && gem update --system 2.6.1 \
-  && gem install bundler --version 1.16.2 \
+  && gem install bundler --version 1.15.1 \
   && bundle config --global jobs 7 \
   && bundle config git.allow_insecure true \
   && bundle config --global build.nokogiri --use-system-libraries
diff --git a/2.3/Dockerfile b/2.3/Dockerfile
index 050898d..bb6ddfc 100644
--- a/2.3/Dockerfile
+++ b/2.3/Dockerfile
@@ -62,7 +62,7 @@ ENV BUNDLE_SILENCE_ROOT_WARNING 1
 RUN echo 'gem: --no-rdoc --no-ri --no-document' > /root/.gemrc \
   && ssh-keyscan -H github.com >> /etc/ssh/ssh_known_hosts \
   && gem update --system 2.6.1 \
-  && gem install bundler --version 1.16.2 \
+  && gem install bundler --version 1.15.1 \
   && bundle config --global jobs 7 \
   && bundle config git.allow_insecure true \
   && bundle config --global build.nokogiri --use-system-libraries
diff --git a/2.4/Dockerfile b/2.4/Dockerfile
index 7360c60..f039925 100644
--- a/2.4/Dockerfile
+++ b/2.4/Dockerfile
@@ -62,7 +62,7 @@ ENV BUNDLE_SILENCE_ROOT_WARNING 1
 RUN echo 'gem: --no-rdoc --no-ri --no-document' > /root/.gemrc \
   && ssh-keyscan -H github.com >> /etc/ssh/ssh_known_hosts \
   && gem update --system 2.6.1 \
-  && gem install bundler --version 1.16.2 \
+  && gem install bundler --version 1.15.1 \
   && bundle config --global jobs 7 \
   && bundle config git.allow_insecure true \
   && bundle config --global build.nokogiri --use-system-libraries