diff --git a/1.9/Dockerfile b/1.9/Dockerfile
index bc376073c..f40c37ba8 100644
--- a/1.9/Dockerfile
+++ b/1.9/Dockerfile
@@ -1,14 +1,12 @@
 FROM buildpack-deps:jessie
 
-RUN apt-get update && apt-get install -y curl procps && rm -rf /var/lib/apt/lists/*
-
 ENV RUBY_MAJOR 1.9
 ENV RUBY_VERSION 1.9.3-p551
 
 # some of ruby's build scripts are written in ruby
 # we purge this later to make sure our final image uses what we just built
 RUN apt-get update \
-	&& apt-get install -y bison ruby \
+	&& apt-get install -y bison libgdbm-dev ruby \
 	&& rm -rf /var/lib/apt/lists/* \
 	&& mkdir -p /usr/src/ruby \
 	&& curl -SL "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.bz2" \
@@ -17,8 +15,8 @@ RUN apt-get update \
 	&& autoconf \
 	&& ./configure --disable-install-doc \
 	&& make \
-	&& apt-get purge -y --auto-remove bison ruby \
 	&& make install \
+	&& apt-get purge -y --auto-remove bison libgdbm-dev ruby \
 	&& rm -r /usr/src/ruby
 
 # skip installing gem documentation
diff --git a/1.9/wheezy/Dockerfile b/1.9/wheezy/Dockerfile
index 0a136e4d4..a0eb5774d 100644
--- a/1.9/wheezy/Dockerfile
+++ b/1.9/wheezy/Dockerfile
@@ -1,14 +1,12 @@
 FROM buildpack-deps:wheezy
 
-RUN apt-get update && apt-get install -y curl procps && rm -rf /var/lib/apt/lists/*
-
 ENV RUBY_MAJOR 1.9
 ENV RUBY_VERSION 1.9.3-p551
 
 # some of ruby's build scripts are written in ruby
 # we purge this later to make sure our final image uses what we just built
 RUN apt-get update \
-	&& apt-get install -y bison ruby \
+	&& apt-get install -y bison libgdbm-dev ruby \
 	&& rm -rf /var/lib/apt/lists/* \
 	&& mkdir -p /usr/src/ruby \
 	&& curl -SL "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.bz2" \
@@ -17,8 +15,8 @@ RUN apt-get update \
 	&& autoconf \
 	&& ./configure --disable-install-doc \
 	&& make \
-	&& apt-get purge -y --auto-remove bison ruby \
 	&& make install \
+	&& apt-get purge -y --auto-remove bison libgdbm-dev ruby \
 	&& rm -r /usr/src/ruby
 
 # skip installing gem documentation
diff --git a/2.0/Dockerfile b/2.0/Dockerfile
index 008f998e4..029beeee4 100644
--- a/2.0/Dockerfile
+++ b/2.0/Dockerfile
@@ -1,14 +1,12 @@
 FROM buildpack-deps:jessie
 
-RUN apt-get update && apt-get install -y curl procps && rm -rf /var/lib/apt/lists/*
-
 ENV RUBY_MAJOR 2.0
 ENV RUBY_VERSION 2.0.0-p598
 
 # some of ruby's build scripts are written in ruby
 # we purge this later to make sure our final image uses what we just built
 RUN apt-get update \
-	&& apt-get install -y bison ruby \
+	&& apt-get install -y bison libgdbm-dev ruby \
 	&& rm -rf /var/lib/apt/lists/* \
 	&& mkdir -p /usr/src/ruby \
 	&& curl -SL "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.bz2" \
@@ -17,8 +15,8 @@ RUN apt-get update \
 	&& autoconf \
 	&& ./configure --disable-install-doc \
 	&& make -j"$(nproc)" \
-	&& apt-get purge -y --auto-remove bison ruby \
 	&& make install \
+	&& apt-get purge -y --auto-remove bison libgdbm-dev ruby \
 	&& rm -r /usr/src/ruby
 
 # skip installing gem documentation
diff --git a/2.0/wheezy/Dockerfile b/2.0/wheezy/Dockerfile
index c6afffb99..db9afec23 100644
--- a/2.0/wheezy/Dockerfile
+++ b/2.0/wheezy/Dockerfile
@@ -1,25 +1,23 @@
 FROM buildpack-deps:wheezy
 
-RUN apt-get update && apt-get install -y curl procps && rm -rf /var/lib/apt/lists/*
-
 ENV RUBY_MAJOR 2.0
 ENV RUBY_VERSION 2.0.0-p598
 
 # some of ruby's build scripts are written in ruby
 # we purge this later to make sure our final image uses what we just built
 RUN apt-get update \
-  && apt-get install -y bison ruby \
-  && rm -rf /var/lib/apt/lists/* \
-  && mkdir -p /usr/src/ruby \
-  && curl -SL "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.bz2" \
-    | tar -xjC /usr/src/ruby --strip-components=1 \
-  && cd /usr/src/ruby \
-  && autoconf \
-  && ./configure --disable-install-doc \
-  && make -j"$(nproc)" \
-  && apt-get purge -y --auto-remove bison ruby \
-  && make install \
-  && rm -r /usr/src/ruby
+	&& apt-get install -y bison libgdbm-dev ruby \
+	&& rm -rf /var/lib/apt/lists/* \
+	&& mkdir -p /usr/src/ruby \
+	&& curl -SL "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.bz2" \
+		| tar -xjC /usr/src/ruby --strip-components=1 \
+	&& cd /usr/src/ruby \
+	&& autoconf \
+	&& ./configure --disable-install-doc \
+	&& make -j"$(nproc)" \
+	&& make install \
+	&& apt-get purge -y --auto-remove bison libgdbm-dev ruby \
+	&& rm -r /usr/src/ruby
 
 # skip installing gem documentation
 RUN echo 'gem: --no-rdoc --no-ri' >> "$HOME/.gemrc"
@@ -28,8 +26,8 @@ RUN echo 'gem: --no-rdoc --no-ri' >> "$HOME/.gemrc"
 ENV GEM_HOME /usr/local/bundle
 ENV PATH $GEM_HOME/bin:$PATH
 RUN gem install bundler \
-  && bundle config --global path "$GEM_HOME" \
-  && bundle config --global bin "$GEM_HOME/bin"
+	&& bundle config --global path "$GEM_HOME" \
+	&& bundle config --global bin "$GEM_HOME/bin"
 
 # 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 dcd0bcccc..4c63d96e2 100644
--- a/2.1/Dockerfile
+++ b/2.1/Dockerfile
@@ -1,14 +1,12 @@
 FROM buildpack-deps:jessie
 
-RUN apt-get update && apt-get install -y curl procps && rm -rf /var/lib/apt/lists/*
-
 ENV RUBY_MAJOR 2.1
 ENV RUBY_VERSION 2.1.5
 
 # some of ruby's build scripts are written in ruby
 # we purge this later to make sure our final image uses what we just built
 RUN apt-get update \
-	&& apt-get install -y bison ruby \
+	&& apt-get install -y bison libgdbm-dev ruby \
 	&& rm -rf /var/lib/apt/lists/* \
 	&& mkdir -p /usr/src/ruby \
 	&& curl -SL "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.bz2" \
@@ -17,8 +15,8 @@ RUN apt-get update \
 	&& autoconf \
 	&& ./configure --disable-install-doc \
 	&& make -j"$(nproc)" \
-	&& apt-get purge -y --auto-remove bison ruby \
 	&& make install \
+	&& apt-get purge -y --auto-remove bison libgdbm-dev ruby \
 	&& rm -r /usr/src/ruby
 
 # skip installing gem documentation
diff --git a/2.1/wheezy/Dockerfile b/2.1/wheezy/Dockerfile
index 829efa9ca..a8f3eba72 100644
--- a/2.1/wheezy/Dockerfile
+++ b/2.1/wheezy/Dockerfile
@@ -1,14 +1,12 @@
 FROM buildpack-deps:wheezy
 
-RUN apt-get update && apt-get install -y curl procps && rm -rf /var/lib/apt/lists/*
-
 ENV RUBY_MAJOR 2.1
 ENV RUBY_VERSION 2.1.5
 
 # some of ruby's build scripts are written in ruby
 # we purge this later to make sure our final image uses what we just built
 RUN apt-get update \
-	&& apt-get install -y bison ruby \
+	&& apt-get install -y bison libgdbm-dev ruby \
 	&& rm -rf /var/lib/apt/lists/* \
 	&& mkdir -p /usr/src/ruby \
 	&& curl -SL "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.bz2" \
@@ -17,8 +15,8 @@ RUN apt-get update \
 	&& autoconf \
 	&& ./configure --disable-install-doc \
 	&& make -j"$(nproc)" \
-	&& apt-get purge -y --auto-remove bison ruby \
 	&& make install \
+	&& apt-get purge -y --auto-remove bison libgdbm-dev ruby \
 	&& rm -r /usr/src/ruby
 
 # skip installing gem documentation
diff --git a/2.2/Dockerfile b/2.2/Dockerfile
index 02e261900..6a52de8ae 100644
--- a/2.2/Dockerfile
+++ b/2.2/Dockerfile
@@ -1,14 +1,12 @@
 FROM buildpack-deps:jessie
 
-RUN apt-get update && apt-get install -y curl procps && rm -rf /var/lib/apt/lists/*
-
 ENV RUBY_MAJOR 2.2
 ENV RUBY_VERSION 2.2.0
 
 # some of ruby's build scripts are written in ruby
 # we purge this later to make sure our final image uses what we just built
 RUN apt-get update \
-	&& apt-get install -y bison ruby \
+	&& apt-get install -y bison libgdbm-dev ruby \
 	&& rm -rf /var/lib/apt/lists/* \
 	&& mkdir -p /usr/src/ruby \
 	&& curl -SL "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.bz2" \
@@ -17,8 +15,8 @@ RUN apt-get update \
 	&& autoconf \
 	&& ./configure --disable-install-doc \
 	&& make -j"$(nproc)" \
-	&& apt-get purge -y --auto-remove bison ruby \
 	&& make install \
+	&& apt-get purge -y --auto-remove bison libgdbm-dev ruby \
 	&& rm -r /usr/src/ruby
 
 # skip installing gem documentation
diff --git a/2.2/wheezy/Dockerfile b/2.2/wheezy/Dockerfile
index 567fe60ff..eebab44aa 100644
--- a/2.2/wheezy/Dockerfile
+++ b/2.2/wheezy/Dockerfile
@@ -1,14 +1,12 @@
 FROM buildpack-deps:wheezy
 
-RUN apt-get update && apt-get install -y curl procps && rm -rf /var/lib/apt/lists/*
-
 ENV RUBY_MAJOR 2.2
 ENV RUBY_VERSION 2.2.0
 
 # some of ruby's build scripts are written in ruby
 # we purge this later to make sure our final image uses what we just built
 RUN apt-get update \
-	&& apt-get install -y bison ruby \
+	&& apt-get install -y bison libgdbm-dev ruby \
 	&& rm -rf /var/lib/apt/lists/* \
 	&& mkdir -p /usr/src/ruby \
 	&& curl -SL "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.bz2" \
@@ -17,8 +15,8 @@ RUN apt-get update \
 	&& autoconf \
 	&& ./configure --disable-install-doc \
 	&& make -j"$(nproc)" \
-	&& apt-get purge -y --auto-remove bison ruby \
 	&& make install \
+	&& apt-get purge -y --auto-remove bison libgdbm-dev ruby \
 	&& rm -r /usr/src/ruby
 
 # skip installing gem documentation