diff --git a/.travis.yml b/.travis.yml
index cb1efe569..39f159fee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,12 +16,6 @@ env:
   - VERSION=2.4 VARIANT=jessie/slim
   - VERSION=2.4 VARIANT=alpine3.9
   - VERSION=2.4 VARIANT=alpine3.8
-  - VERSION=2.3 VARIANT=stretch
-  - VERSION=2.3 VARIANT=stretch/slim
-  - VERSION=2.3 VARIANT=jessie
-  - VERSION=2.3 VARIANT=jessie/slim
-  - VERSION=2.3 VARIANT=alpine3.8
-  - VERSION=2.3 VARIANT=alpine3.7
 
 install:
   - git clone --depth 1 https://github.com/docker-library/official-images.git ~/official-images
diff --git a/2.3/alpine3.7/Dockerfile b/2.3/alpine3.7/Dockerfile
deleted file mode 100644
index 442ef6da1..000000000
--- a/2.3/alpine3.7/Dockerfile
+++ /dev/null
@@ -1,122 +0,0 @@
-FROM alpine:3.7
-
-RUN apk add --no-cache \
-		gmp-dev
-
-# skip installing gem documentation
-RUN mkdir -p /usr/local/etc \
-	&& { \
-		echo 'install: --no-document'; \
-		echo 'update: --no-document'; \
-	} >> /usr/local/etc/gemrc
-
-ENV RUBY_MAJOR 2.3
-ENV RUBY_VERSION 2.3.8
-ENV RUBY_DOWNLOAD_SHA256 910f635d84fd0d81ac9bdee0731279e6026cb4cd1315bbbb5dfb22e09c5c1dfe
-ENV RUBYGEMS_VERSION 3.0.3
-
-# some of ruby's build scripts are written in ruby
-#   we purge system ruby later to make sure our final image uses what we just built
-# readline-dev vs libedit-dev: https://bugs.ruby-lang.org/issues/11869 and https://github.com/docker-library/ruby/issues/75
-RUN set -ex \
-	\
-	&& apk add --no-cache --virtual .ruby-builddeps \
-		autoconf \
-		bison \
-		bzip2 \
-		bzip2-dev \
-		ca-certificates \
-		coreutils \
-		dpkg-dev dpkg \
-		gcc \
-		gdbm-dev \
-		glib-dev \
-		libc-dev \
-		libffi-dev \
-		libxml2-dev \
-		libxslt-dev \
-		linux-headers \
-		make \
-		ncurses-dev \
-		libressl \
-		libressl-dev \
-		procps \
-		readline-dev \
-		ruby \
-		tar \
-		xz \
-		yaml-dev \
-		zlib-dev \
-	\
-	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
-	\
-	&& mkdir -p /usr/src/ruby \
-	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.xz \
-	\
-	&& cd /usr/src/ruby \
-	\
-# https://github.com/docker-library/ruby/issues/196
-# https://bugs.ruby-lang.org/issues/14387#note-13 (patch source)
-# https://bugs.ruby-lang.org/issues/14387#note-16 ("Therefore ncopa's patch looks good for me in general." -- only breaks glibc which doesn't matter here)
-	&& wget -O 'thread-stack-fix.patch' 'https://bugs.ruby-lang.org/attachments/download/7081/0001-thread_pthread.c-make-get_main_stack-portable-on-lin.patch' \
-	&& echo '3ab628a51d92fdf0d2b5835e93564857aea73e0c1de00313864a94a6255cb645 *thread-stack-fix.patch' | sha256sum -c - \
-	&& patch -p1 -i thread-stack-fix.patch \
-	&& rm thread-stack-fix.patch \
-	\
-# hack in "ENABLE_PATH_CHECK" disabling to suppress:
-#   warning: Insecure world writable dir
-	&& { \
-		echo '#define ENABLE_PATH_CHECK 0'; \
-		echo; \
-		cat file.c; \
-	} > file.c.new \
-	&& mv file.c.new file.c \
-	\
-	&& autoconf \
-	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
-# the configure script does not detect isnan/isinf as macros
-	&& export ac_cv_func_isnan=yes ac_cv_func_isinf=yes \
-	&& ./configure \
-		--build="$gnuArch" \
-		--disable-install-doc \
-		--enable-shared \
-	&& make -j "$(nproc)" \
-	&& make install \
-	\
-	&& runDeps="$( \
-		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local \
-			| tr ',' '\n' \
-			| sort -u \
-			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
-	)" \
-	&& apk add --no-network --virtual .ruby-rundeps $runDeps \
-		bzip2 \
-		ca-certificates \
-		libffi-dev \
-		procps \
-		yaml-dev \
-		zlib-dev \
-	&& apk del --no-network .ruby-builddeps \
-	&& cd / \
-	&& rm -r /usr/src/ruby \
-# make sure bundled "rubygems" is older than RUBYGEMS_VERSION (https://github.com/docker-library/ruby/issues/246)
-	&& ruby -e 'exit(Gem::Version.create(ENV["RUBYGEMS_VERSION"]) > Gem::Version.create(Gem::VERSION))' \
-	&& gem update --system "$RUBYGEMS_VERSION" && rm -r /root/.gem/ \
-# rough smoke test
-	&& ruby --version && gem --version && bundle --version
-
-# install things globally, for great justice
-# and don't create ".bundle" in all our apps
-ENV GEM_HOME /usr/local/bundle
-ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_SILENCE_ROOT_WARNING=1 \
-	BUNDLE_APP_CONFIG="$GEM_HOME"
-# path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
-# adjust permissions of a few directories for running "gem install" as an arbitrary user
-RUN mkdir -p "$GEM_HOME" && chmod 777 "$GEM_HOME"
-# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
-
-CMD [ "irb" ]
diff --git a/2.3/alpine3.8/Dockerfile b/2.3/alpine3.8/Dockerfile
deleted file mode 100644
index 2dd27a647..000000000
--- a/2.3/alpine3.8/Dockerfile
+++ /dev/null
@@ -1,122 +0,0 @@
-FROM alpine:3.8
-
-RUN apk add --no-cache \
-		gmp-dev
-
-# skip installing gem documentation
-RUN mkdir -p /usr/local/etc \
-	&& { \
-		echo 'install: --no-document'; \
-		echo 'update: --no-document'; \
-	} >> /usr/local/etc/gemrc
-
-ENV RUBY_MAJOR 2.3
-ENV RUBY_VERSION 2.3.8
-ENV RUBY_DOWNLOAD_SHA256 910f635d84fd0d81ac9bdee0731279e6026cb4cd1315bbbb5dfb22e09c5c1dfe
-ENV RUBYGEMS_VERSION 3.0.3
-
-# some of ruby's build scripts are written in ruby
-#   we purge system ruby later to make sure our final image uses what we just built
-# readline-dev vs libedit-dev: https://bugs.ruby-lang.org/issues/11869 and https://github.com/docker-library/ruby/issues/75
-RUN set -ex \
-	\
-	&& apk add --no-cache --virtual .ruby-builddeps \
-		autoconf \
-		bison \
-		bzip2 \
-		bzip2-dev \
-		ca-certificates \
-		coreutils \
-		dpkg-dev dpkg \
-		gcc \
-		gdbm-dev \
-		glib-dev \
-		libc-dev \
-		libffi-dev \
-		libxml2-dev \
-		libxslt-dev \
-		linux-headers \
-		make \
-		ncurses-dev \
-		libressl \
-		libressl-dev \
-		procps \
-		readline-dev \
-		ruby \
-		tar \
-		xz \
-		yaml-dev \
-		zlib-dev \
-	\
-	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
-	\
-	&& mkdir -p /usr/src/ruby \
-	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.xz \
-	\
-	&& cd /usr/src/ruby \
-	\
-# https://github.com/docker-library/ruby/issues/196
-# https://bugs.ruby-lang.org/issues/14387#note-13 (patch source)
-# https://bugs.ruby-lang.org/issues/14387#note-16 ("Therefore ncopa's patch looks good for me in general." -- only breaks glibc which doesn't matter here)
-	&& wget -O 'thread-stack-fix.patch' 'https://bugs.ruby-lang.org/attachments/download/7081/0001-thread_pthread.c-make-get_main_stack-portable-on-lin.patch' \
-	&& echo '3ab628a51d92fdf0d2b5835e93564857aea73e0c1de00313864a94a6255cb645 *thread-stack-fix.patch' | sha256sum -c - \
-	&& patch -p1 -i thread-stack-fix.patch \
-	&& rm thread-stack-fix.patch \
-	\
-# hack in "ENABLE_PATH_CHECK" disabling to suppress:
-#   warning: Insecure world writable dir
-	&& { \
-		echo '#define ENABLE_PATH_CHECK 0'; \
-		echo; \
-		cat file.c; \
-	} > file.c.new \
-	&& mv file.c.new file.c \
-	\
-	&& autoconf \
-	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
-# the configure script does not detect isnan/isinf as macros
-	&& export ac_cv_func_isnan=yes ac_cv_func_isinf=yes \
-	&& ./configure \
-		--build="$gnuArch" \
-		--disable-install-doc \
-		--enable-shared \
-	&& make -j "$(nproc)" \
-	&& make install \
-	\
-	&& runDeps="$( \
-		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local \
-			| tr ',' '\n' \
-			| sort -u \
-			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
-	)" \
-	&& apk add --no-network --virtual .ruby-rundeps $runDeps \
-		bzip2 \
-		ca-certificates \
-		libffi-dev \
-		procps \
-		yaml-dev \
-		zlib-dev \
-	&& apk del --no-network .ruby-builddeps \
-	&& cd / \
-	&& rm -r /usr/src/ruby \
-# make sure bundled "rubygems" is older than RUBYGEMS_VERSION (https://github.com/docker-library/ruby/issues/246)
-	&& ruby -e 'exit(Gem::Version.create(ENV["RUBYGEMS_VERSION"]) > Gem::Version.create(Gem::VERSION))' \
-	&& gem update --system "$RUBYGEMS_VERSION" && rm -r /root/.gem/ \
-# rough smoke test
-	&& ruby --version && gem --version && bundle --version
-
-# install things globally, for great justice
-# and don't create ".bundle" in all our apps
-ENV GEM_HOME /usr/local/bundle
-ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_SILENCE_ROOT_WARNING=1 \
-	BUNDLE_APP_CONFIG="$GEM_HOME"
-# path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
-# adjust permissions of a few directories for running "gem install" as an arbitrary user
-RUN mkdir -p "$GEM_HOME" && chmod 777 "$GEM_HOME"
-# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
-
-CMD [ "irb" ]
diff --git a/2.3/jessie/Dockerfile b/2.3/jessie/Dockerfile
deleted file mode 100644
index fd7a25119..000000000
--- a/2.3/jessie/Dockerfile
+++ /dev/null
@@ -1,77 +0,0 @@
-FROM buildpack-deps:jessie
-
-# skip installing gem documentation
-RUN mkdir -p /usr/local/etc \
-	&& { \
-		echo 'install: --no-document'; \
-		echo 'update: --no-document'; \
-	} >> /usr/local/etc/gemrc
-
-ENV RUBY_MAJOR 2.3
-ENV RUBY_VERSION 2.3.8
-ENV RUBY_DOWNLOAD_SHA256 910f635d84fd0d81ac9bdee0731279e6026cb4cd1315bbbb5dfb22e09c5c1dfe
-ENV RUBYGEMS_VERSION 3.0.3
-
-# some of ruby's build scripts are written in ruby
-#   we purge system ruby later to make sure our final image uses what we just built
-RUN set -ex \
-	\
-	&& buildDeps=' \
-		bison \
-		dpkg-dev \
-		libgdbm-dev \
-		ruby \
-	' \
-	&& apt-get update \
-	&& apt-get install -y --no-install-recommends $buildDeps \
-	&& rm -rf /var/lib/apt/lists/* \
-	\
-	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
-	\
-	&& mkdir -p /usr/src/ruby \
-	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.xz \
-	\
-	&& cd /usr/src/ruby \
-	\
-# hack in "ENABLE_PATH_CHECK" disabling to suppress:
-#   warning: Insecure world writable dir
-	&& { \
-		echo '#define ENABLE_PATH_CHECK 0'; \
-		echo; \
-		cat file.c; \
-	} > file.c.new \
-	&& mv file.c.new file.c \
-	\
-	&& autoconf \
-	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
-	&& ./configure \
-		--build="$gnuArch" \
-		--disable-install-doc \
-		--enable-shared \
-	&& make -j "$(nproc)" \
-	&& make install \
-	\
-	&& apt-get purge -y --auto-remove $buildDeps \
-	&& cd / \
-	&& rm -r /usr/src/ruby \
-# make sure bundled "rubygems" is older than RUBYGEMS_VERSION (https://github.com/docker-library/ruby/issues/246)
-	&& ruby -e 'exit(Gem::Version.create(ENV["RUBYGEMS_VERSION"]) > Gem::Version.create(Gem::VERSION))' \
-	&& gem update --system "$RUBYGEMS_VERSION" && rm -r /root/.gem/ \
-# rough smoke test
-	&& ruby --version && gem --version && bundle --version
-
-# install things globally, for great justice
-# and don't create ".bundle" in all our apps
-ENV GEM_HOME /usr/local/bundle
-ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_SILENCE_ROOT_WARNING=1 \
-	BUNDLE_APP_CONFIG="$GEM_HOME"
-# path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
-# adjust permissions of a few directories for running "gem install" as an arbitrary user
-RUN mkdir -p "$GEM_HOME" && chmod 777 "$GEM_HOME"
-# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
-
-CMD [ "irb" ]
diff --git a/2.3/jessie/slim/Dockerfile b/2.3/jessie/slim/Dockerfile
deleted file mode 100644
index 56b5b8d17..000000000
--- a/2.3/jessie/slim/Dockerfile
+++ /dev/null
@@ -1,109 +0,0 @@
-FROM debian:jessie-slim
-
-RUN apt-get update \
-	&& apt-get install -y --no-install-recommends \
-		bzip2 \
-		ca-certificates \
-		libffi-dev \
-		libgdbm3 \
-		libgmp-dev \
-		libssl-dev \
-		libyaml-dev \
-		procps \
-		zlib1g-dev \
-	&& rm -rf /var/lib/apt/lists/*
-
-# skip installing gem documentation
-RUN mkdir -p /usr/local/etc \
-	&& { \
-		echo 'install: --no-document'; \
-		echo 'update: --no-document'; \
-	} >> /usr/local/etc/gemrc
-
-ENV RUBY_MAJOR 2.3
-ENV RUBY_VERSION 2.3.8
-ENV RUBY_DOWNLOAD_SHA256 910f635d84fd0d81ac9bdee0731279e6026cb4cd1315bbbb5dfb22e09c5c1dfe
-ENV RUBYGEMS_VERSION 3.0.3
-
-# some of ruby's build scripts are written in ruby
-#   we purge system ruby later to make sure our final image uses what we just built
-RUN set -ex \
-	\
-	&& savedAptMark="$(apt-mark showmanual)" \
-	&& apt-get update && apt-get install -y --no-install-recommends \
-		autoconf \
-		bison \
-		dpkg-dev \
-		gcc \
-		libbz2-dev \
-		libgdbm-dev \
-		libglib2.0-dev \
-		libncurses-dev \
-		libreadline-dev \
-		libxml2-dev \
-		libxslt-dev \
-		make \
-		ruby \
-		wget \
-		xz-utils \
-	&& rm -rf /var/lib/apt/lists/* \
-	\
-	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
-	\
-	&& mkdir -p /usr/src/ruby \
-	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.xz \
-	\
-	&& cd /usr/src/ruby \
-	\
-# hack in "ENABLE_PATH_CHECK" disabling to suppress:
-#   warning: Insecure world writable dir
-	&& { \
-		echo '#define ENABLE_PATH_CHECK 0'; \
-		echo; \
-		cat file.c; \
-	} > file.c.new \
-	&& mv file.c.new file.c \
-	\
-	&& autoconf \
-	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
-	&& ./configure \
-		--build="$gnuArch" \
-		--disable-install-doc \
-		--enable-shared \
-	&& make -j "$(nproc)" \
-	&& make install \
-	\
-	&& apt-mark auto '.*' > /dev/null \
-	&& apt-mark manual $savedAptMark \
-	&& find /usr/local -type f -executable -not \( -name '*tkinter*' \) -exec ldd '{}' ';' \
-		| awk '/=>/ { print $(NF-1) }' \
-		| sort -u \
-		| xargs -r dpkg-query --search \
-		| cut -d: -f1 \
-		| sort -u \
-		| xargs -r apt-mark manual \
-	&& apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
-	\
-	&& cd / \
-	&& rm -r /usr/src/ruby \
-# make sure bundled "rubygems" is older than RUBYGEMS_VERSION (https://github.com/docker-library/ruby/issues/246)
-	&& ruby -e 'exit(Gem::Version.create(ENV["RUBYGEMS_VERSION"]) > Gem::Version.create(Gem::VERSION))' \
-	&& gem update --system "$RUBYGEMS_VERSION" && rm -r /root/.gem/ \
-# rough smoke test
-	&& ruby --version && gem --version && bundle --version
-
-# install things globally, for great justice
-# and don't create ".bundle" in all our apps
-ENV GEM_HOME /usr/local/bundle
-ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_SILENCE_ROOT_WARNING=1 \
-	BUNDLE_APP_CONFIG="$GEM_HOME"
-# path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
-# adjust permissions of a few directories for running "gem install" as an arbitrary user
-RUN mkdir -p "$GEM_HOME" && chmod 777 "$GEM_HOME"
-# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
-
-CMD [ "irb" ]
diff --git a/2.3/stretch/Dockerfile b/2.3/stretch/Dockerfile
deleted file mode 100644
index 74ec5e57e..000000000
--- a/2.3/stretch/Dockerfile
+++ /dev/null
@@ -1,79 +0,0 @@
-FROM buildpack-deps:stretch
-
-# skip installing gem documentation
-RUN mkdir -p /usr/local/etc \
-	&& { \
-		echo 'install: --no-document'; \
-		echo 'update: --no-document'; \
-	} >> /usr/local/etc/gemrc
-
-ENV RUBY_MAJOR 2.3
-ENV RUBY_VERSION 2.3.8
-ENV RUBY_DOWNLOAD_SHA256 910f635d84fd0d81ac9bdee0731279e6026cb4cd1315bbbb5dfb22e09c5c1dfe
-ENV RUBYGEMS_VERSION 3.0.3
-
-# some of ruby's build scripts are written in ruby
-#   we purge system ruby later to make sure our final image uses what we just built
-RUN set -ex \
-	\
-	&& buildDeps=' \
-		bison \
-		dpkg-dev \
-		libgdbm-dev \
-		# ruby 2.3 on stretch can only support libssl1.0-dev (libssl dev from buildpack-deps is 1.1.x)
-		libssl1.0-dev \
-		ruby \
-	' \
-	&& apt-get update \
-	&& apt-get install -y --no-install-recommends $buildDeps \
-	&& rm -rf /var/lib/apt/lists/* \
-	\
-	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
-	\
-	&& mkdir -p /usr/src/ruby \
-	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.xz \
-	\
-	&& cd /usr/src/ruby \
-	\
-# hack in "ENABLE_PATH_CHECK" disabling to suppress:
-#   warning: Insecure world writable dir
-	&& { \
-		echo '#define ENABLE_PATH_CHECK 0'; \
-		echo; \
-		cat file.c; \
-	} > file.c.new \
-	&& mv file.c.new file.c \
-	\
-	&& autoconf \
-	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
-	&& ./configure \
-		--build="$gnuArch" \
-		--disable-install-doc \
-		--enable-shared \
-	&& make -j "$(nproc)" \
-	&& make install \
-	\
-	&& apt-get purge -y --auto-remove $buildDeps \
-	&& cd / \
-	&& rm -r /usr/src/ruby \
-# make sure bundled "rubygems" is older than RUBYGEMS_VERSION (https://github.com/docker-library/ruby/issues/246)
-	&& ruby -e 'exit(Gem::Version.create(ENV["RUBYGEMS_VERSION"]) > Gem::Version.create(Gem::VERSION))' \
-	&& gem update --system "$RUBYGEMS_VERSION" && rm -r /root/.gem/ \
-# rough smoke test
-	&& ruby --version && gem --version && bundle --version
-
-# install things globally, for great justice
-# and don't create ".bundle" in all our apps
-ENV GEM_HOME /usr/local/bundle
-ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_SILENCE_ROOT_WARNING=1 \
-	BUNDLE_APP_CONFIG="$GEM_HOME"
-# path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
-# adjust permissions of a few directories for running "gem install" as an arbitrary user
-RUN mkdir -p "$GEM_HOME" && chmod 777 "$GEM_HOME"
-# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
-
-CMD [ "irb" ]
diff --git a/2.3/stretch/slim/Dockerfile b/2.3/stretch/slim/Dockerfile
deleted file mode 100644
index 0d2a12d5d..000000000
--- a/2.3/stretch/slim/Dockerfile
+++ /dev/null
@@ -1,109 +0,0 @@
-FROM debian:stretch-slim
-
-RUN apt-get update \
-	&& apt-get install -y --no-install-recommends \
-		bzip2 \
-		ca-certificates \
-		libffi-dev \
-		libgdbm3 \
-		libgmp-dev \
-		libssl1.0-dev \
-		libyaml-dev \
-		procps \
-		zlib1g-dev \
-	&& rm -rf /var/lib/apt/lists/*
-
-# skip installing gem documentation
-RUN mkdir -p /usr/local/etc \
-	&& { \
-		echo 'install: --no-document'; \
-		echo 'update: --no-document'; \
-	} >> /usr/local/etc/gemrc
-
-ENV RUBY_MAJOR 2.3
-ENV RUBY_VERSION 2.3.8
-ENV RUBY_DOWNLOAD_SHA256 910f635d84fd0d81ac9bdee0731279e6026cb4cd1315bbbb5dfb22e09c5c1dfe
-ENV RUBYGEMS_VERSION 3.0.3
-
-# some of ruby's build scripts are written in ruby
-#   we purge system ruby later to make sure our final image uses what we just built
-RUN set -ex \
-	\
-	&& savedAptMark="$(apt-mark showmanual)" \
-	&& apt-get update && apt-get install -y --no-install-recommends \
-		autoconf \
-		bison \
-		dpkg-dev \
-		gcc \
-		libbz2-dev \
-		libgdbm-dev \
-		libglib2.0-dev \
-		libncurses-dev \
-		libreadline-dev \
-		libxml2-dev \
-		libxslt-dev \
-		make \
-		ruby \
-		wget \
-		xz-utils \
-	&& rm -rf /var/lib/apt/lists/* \
-	\
-	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
-	\
-	&& mkdir -p /usr/src/ruby \
-	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.xz \
-	\
-	&& cd /usr/src/ruby \
-	\
-# hack in "ENABLE_PATH_CHECK" disabling to suppress:
-#   warning: Insecure world writable dir
-	&& { \
-		echo '#define ENABLE_PATH_CHECK 0'; \
-		echo; \
-		cat file.c; \
-	} > file.c.new \
-	&& mv file.c.new file.c \
-	\
-	&& autoconf \
-	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
-	&& ./configure \
-		--build="$gnuArch" \
-		--disable-install-doc \
-		--enable-shared \
-	&& make -j "$(nproc)" \
-	&& make install \
-	\
-	&& apt-mark auto '.*' > /dev/null \
-	&& apt-mark manual $savedAptMark \
-	&& find /usr/local -type f -executable -not \( -name '*tkinter*' \) -exec ldd '{}' ';' \
-		| awk '/=>/ { print $(NF-1) }' \
-		| sort -u \
-		| xargs -r dpkg-query --search \
-		| cut -d: -f1 \
-		| sort -u \
-		| xargs -r apt-mark manual \
-	&& apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
-	\
-	&& cd / \
-	&& rm -r /usr/src/ruby \
-# make sure bundled "rubygems" is older than RUBYGEMS_VERSION (https://github.com/docker-library/ruby/issues/246)
-	&& ruby -e 'exit(Gem::Version.create(ENV["RUBYGEMS_VERSION"]) > Gem::Version.create(Gem::VERSION))' \
-	&& gem update --system "$RUBYGEMS_VERSION" && rm -r /root/.gem/ \
-# rough smoke test
-	&& ruby --version && gem --version && bundle --version
-
-# install things globally, for great justice
-# and don't create ".bundle" in all our apps
-ENV GEM_HOME /usr/local/bundle
-ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_SILENCE_ROOT_WARNING=1 \
-	BUNDLE_APP_CONFIG="$GEM_HOME"
-# path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
-# adjust permissions of a few directories for running "gem install" as an arbitrary user
-RUN mkdir -p "$GEM_HOME" && chmod 777 "$GEM_HOME"
-# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
-
-CMD [ "irb" ]
diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index 8cae1f194..785213f52 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -20,8 +20,6 @@ RUN set -ex \
 		bison \
 		dpkg-dev \
 		libgdbm-dev \
-		# ruby 2.3 on stretch can only support libssl1.0-dev (libssl dev from buildpack-deps is 1.1.x)
-		libssl1.0-dev \
 		ruby \
 	' \
 	&& apt-get update \
diff --git a/generate-stackbrew-library.sh b/generate-stackbrew-library.sh
index c3bff027f..f1adcbe09 100755
--- a/generate-stackbrew-library.sh
+++ b/generate-stackbrew-library.sh
@@ -9,7 +9,7 @@ declare -A aliases=(
 defaultDebianSuite='stretch'
 defaultAlpineVersion='3.9'
 declare -A alpineVersion=(
-	[2.3]='3.8'
+	#[2.3]='3.8'
 )
 
 self="$(basename "$BASH_SOURCE")"
diff --git a/update.sh b/update.sh
index 85d8100a6..0102506f7 100755
--- a/update.sh
+++ b/update.sh
@@ -94,13 +94,6 @@ for version in "${versions[@]}"; do
 			-e 's!%%FULL_VERSION%%!'"$fullVersion"'!g' \
 			-e 's!%%SHA256%%!'"$shaVal"'!g' \
 			-e 's!%%RUBYGEMS%%!'"$rubygems"'!g' \
-			-e "$(
-				if [ "$version" = 2.3 ] && [[ "$v" = stretch* ]]; then
-					echo 's/libssl-dev/libssl1.0-dev/g'
-				else
-					echo '/libssl1.0-dev/d'
-				fi
-			)" \
 			-e 's/^(FROM (debian|buildpack-deps|alpine)):.*/\1:'"$tag"'/' \
 			"$template" > "$dir/Dockerfile"