diff --git a/2.1/slim/Dockerfile b/2.1/slim/Dockerfile
new file mode 100644
index 000000000..58fa6c6b8
--- /dev/null
+++ b/2.1/slim/Dockerfile
@@ -0,0 +1,55 @@
+FROM debian:jessie
+
+RUN apt-get update \
+	&& apt-get install -y --no-install-recommends \
+		bzip2 \
+		ca-certificates \
+		curl \
+		libffi-dev \
+		libgdbm3 \
+		libssl-dev \
+		libyaml-dev \
+		procps \
+		zlib1g-dev \
+	&& 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 buildDeps=' \
+		autoconf \
+		bison \
+		gcc \
+		libbz2-dev \
+		libgdbm-dev \
+		libglib2.0-dev \
+		libncurses-dev \
+		libreadline-dev \
+		libxml2-dev \
+		libxslt-dev \
+		make \
+		ruby \
+	'; \
+	set -x \
+	&& apt-get update \
+	&& apt-get install -y --no-install-recommends $buildDeps \
+	&& rm -rf /var/lib/apt/lists/* \
+	&& mkdir -p /usr/src/ruby \
+	&& curl -SL "http://cache.ruby-lang.org/pub/ruby/$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 \
+	&& rm -r /usr/src/ruby \
+	&& apt-get purge -y --auto-remove $buildDeps
+
+# skip installing gem documentation
+RUN echo 'gem: --no-rdoc --no-ri' >> /.gemrc
+
+RUN gem install bundler
+
+CMD [ "irb" ]