diff --git a/2.0/Dockerfile b/2.0/Dockerfile
index 5cbeeb45f..503c78c6c 100644
--- a/2.0/Dockerfile
+++ b/2.0/Dockerfile
@@ -36,7 +36,7 @@ ENV BUNDLER_VERSION 1.11.2
 RUN gem install bundler --version "$BUNDLER_VERSION" \
 	&& bundle config --global path "$GEM_HOME" \
 	&& bundle config --global bin "$GEM_HOME/bin" \
-  && bundle config --global silence_root_warning true
+	&& bundle config --global silence_root_warning true
 
 # don't create ".bundle" in all our apps
 ENV BUNDLE_APP_CONFIG $GEM_HOME
diff --git a/2.0/slim/Dockerfile b/2.0/slim/Dockerfile
index 2a66bafdc..707f936ba 100644
--- a/2.0/slim/Dockerfile
+++ b/2.0/slim/Dockerfile
@@ -64,7 +64,7 @@ ENV BUNDLER_VERSION 1.11.2
 RUN gem install bundler --version "$BUNDLER_VERSION" \
 	&& bundle config --global path "$GEM_HOME" \
 	&& bundle config --global bin "$GEM_HOME/bin" \
-  && bundle config --global silence_root_warning true
+	&& bundle config --global silence_root_warning true
 
 # don't create ".bundle" in all our apps
 ENV BUNDLE_APP_CONFIG $GEM_HOME
diff --git a/2.1/Dockerfile b/2.1/Dockerfile
index 896221633..c0934d6bc 100644
--- a/2.1/Dockerfile
+++ b/2.1/Dockerfile
@@ -36,7 +36,7 @@ ENV BUNDLER_VERSION 1.11.2
 RUN gem install bundler --version "$BUNDLER_VERSION" \
 	&& bundle config --global path "$GEM_HOME" \
 	&& bundle config --global bin "$GEM_HOME/bin" \
-  && bundle config --global silence_root_warning true
+	&& bundle config --global silence_root_warning true
 
 # don't create ".bundle" in all our apps
 ENV BUNDLE_APP_CONFIG $GEM_HOME
diff --git a/2.1/slim/Dockerfile b/2.1/slim/Dockerfile
index 64a349b09..7c5f5597d 100644
--- a/2.1/slim/Dockerfile
+++ b/2.1/slim/Dockerfile
@@ -64,7 +64,7 @@ ENV BUNDLER_VERSION 1.11.2
 RUN gem install bundler --version "$BUNDLER_VERSION" \
 	&& bundle config --global path "$GEM_HOME" \
 	&& bundle config --global bin "$GEM_HOME/bin" \
-  && bundle config --global silence_root_warning true
+	&& bundle config --global silence_root_warning true
 
 # don't create ".bundle" in all our apps
 ENV BUNDLE_APP_CONFIG $GEM_HOME
diff --git a/2.2/Dockerfile b/2.2/Dockerfile
index 949757ef4..2f23b2e0a 100644
--- a/2.2/Dockerfile
+++ b/2.2/Dockerfile
@@ -36,7 +36,7 @@ ENV BUNDLER_VERSION 1.11.2
 RUN gem install bundler --version "$BUNDLER_VERSION" \
 	&& bundle config --global path "$GEM_HOME" \
 	&& bundle config --global bin "$GEM_HOME/bin" \
-  && bundle config --global silence_root_warning true
+	&& bundle config --global silence_root_warning true
 
 # don't create ".bundle" in all our apps
 ENV BUNDLE_APP_CONFIG $GEM_HOME
diff --git a/2.2/slim/Dockerfile b/2.2/slim/Dockerfile
index 0b5b83ef8..1ae84df04 100644
--- a/2.2/slim/Dockerfile
+++ b/2.2/slim/Dockerfile
@@ -64,7 +64,7 @@ ENV BUNDLER_VERSION 1.11.2
 RUN gem install bundler --version "$BUNDLER_VERSION" \
 	&& bundle config --global path "$GEM_HOME" \
 	&& bundle config --global bin "$GEM_HOME/bin" \
-  && bundle config --global silence_root_warning true
+	&& bundle config --global silence_root_warning true
 
 # don't create ".bundle" in all our apps
 ENV BUNDLE_APP_CONFIG $GEM_HOME
diff --git a/2.3/Dockerfile b/2.3/Dockerfile
index c54f74b79..cebe509b1 100644
--- a/2.3/Dockerfile
+++ b/2.3/Dockerfile
@@ -36,7 +36,7 @@ ENV BUNDLER_VERSION 1.11.2
 RUN gem install bundler --version "$BUNDLER_VERSION" \
 	&& bundle config --global path "$GEM_HOME" \
 	&& bundle config --global bin "$GEM_HOME/bin" \
-  && bundle config --global silence_root_warning true
+	&& bundle config --global silence_root_warning true
 
 # don't create ".bundle" in all our apps
 ENV BUNDLE_APP_CONFIG $GEM_HOME
diff --git a/2.3/slim/Dockerfile b/2.3/slim/Dockerfile
index 528608691..bed64e1b7 100644
--- a/2.3/slim/Dockerfile
+++ b/2.3/slim/Dockerfile
@@ -64,7 +64,7 @@ ENV BUNDLER_VERSION 1.11.2
 RUN gem install bundler --version "$BUNDLER_VERSION" \
 	&& bundle config --global path "$GEM_HOME" \
 	&& bundle config --global bin "$GEM_HOME/bin" \
-  && bundle config --global silence_root_warning true
+	&& bundle config --global silence_root_warning true
 
 # don't create ".bundle" in all our apps
 ENV BUNDLE_APP_CONFIG $GEM_HOME