diff --git a/2.3/jessie/Dockerfile b/2.3/jessie/Dockerfile
index 9a659d2952..0043dc9ab6 100644
--- a/2.3/jessie/Dockerfile
+++ b/2.3/jessie/Dockerfile
@@ -23,8 +23,11 @@ RUN set -ex \
 		libgdbm-dev \
 		ruby \
 	' \
+	&& runtimeDeps=' \
+	    libjemalloc-dev \
+	' \
 	&& apt-get update \
-	&& apt-get install -y --no-install-recommends $buildDeps \
+	&& apt-get install -y --no-install-recommends $buildDeps $runtimeDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
 	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
@@ -51,6 +54,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -62,6 +66,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/2.3/jessie/slim/Dockerfile b/2.3/jessie/slim/Dockerfile
index 4ddcc4fa3f..2c75f3cc83 100644
--- a/2.3/jessie/slim/Dockerfile
+++ b/2.3/jessie/slim/Dockerfile
@@ -6,6 +6,7 @@ RUN apt-get update \
 		ca-certificates \
 		libffi-dev \
 		libgdbm3 \
+		libjemalloc-dev \
 		libssl-dev \
 		libyaml-dev \
 		procps \
@@ -74,6 +75,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -88,6 +90,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/2.3/stretch/Dockerfile b/2.3/stretch/Dockerfile
index b16e8fa14c..558c55b9bd 100644
--- a/2.3/stretch/Dockerfile
+++ b/2.3/stretch/Dockerfile
@@ -25,8 +25,11 @@ RUN set -ex \
 		libssl1.0-dev \
 		ruby \
 	' \
+	&& runtimeDeps=' \
+	    libjemalloc-dev \
+	' \
 	&& apt-get update \
-	&& apt-get install -y --no-install-recommends $buildDeps \
+	&& apt-get install -y --no-install-recommends $buildDeps $runtimeDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
 	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
@@ -53,6 +56,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -64,6 +68,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/2.3/stretch/slim/Dockerfile b/2.3/stretch/slim/Dockerfile
index 29ac2d83ae..2503e564a7 100644
--- a/2.3/stretch/slim/Dockerfile
+++ b/2.3/stretch/slim/Dockerfile
@@ -6,6 +6,7 @@ RUN apt-get update \
 		ca-certificates \
 		libffi-dev \
 		libgdbm3 \
+		libjemalloc-dev \
 		libssl1.0-dev \
 		libyaml-dev \
 		procps \
@@ -74,6 +75,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -88,6 +90,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/2.4/jessie/Dockerfile b/2.4/jessie/Dockerfile
index 346510bf97..06ea246455 100644
--- a/2.4/jessie/Dockerfile
+++ b/2.4/jessie/Dockerfile
@@ -23,8 +23,11 @@ RUN set -ex \
 		libgdbm-dev \
 		ruby \
 	' \
+	&& runtimeDeps=' \
+	    libjemalloc-dev \
+	' \
 	&& apt-get update \
-	&& apt-get install -y --no-install-recommends $buildDeps \
+	&& apt-get install -y --no-install-recommends $buildDeps $runtimeDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
 	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
@@ -51,6 +54,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -62,6 +66,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/2.4/jessie/slim/Dockerfile b/2.4/jessie/slim/Dockerfile
index 5cdd55c097..a88c927224 100644
--- a/2.4/jessie/slim/Dockerfile
+++ b/2.4/jessie/slim/Dockerfile
@@ -6,6 +6,7 @@ RUN apt-get update \
 		ca-certificates \
 		libffi-dev \
 		libgdbm3 \
+		libjemalloc-dev \
 		libssl-dev \
 		libyaml-dev \
 		procps \
@@ -74,6 +75,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -88,6 +90,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/2.4/stretch/Dockerfile b/2.4/stretch/Dockerfile
index 06ad58d4f7..93ef957260 100644
--- a/2.4/stretch/Dockerfile
+++ b/2.4/stretch/Dockerfile
@@ -23,8 +23,11 @@ RUN set -ex \
 		libgdbm-dev \
 		ruby \
 	' \
+	&& runtimeDeps=' \
+	    libjemalloc-dev \
+	' \
 	&& apt-get update \
-	&& apt-get install -y --no-install-recommends $buildDeps \
+	&& apt-get install -y --no-install-recommends $buildDeps $runtimeDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
 	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
@@ -51,6 +54,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -62,6 +66,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/2.4/stretch/slim/Dockerfile b/2.4/stretch/slim/Dockerfile
index 8719bebfa0..353945e7ce 100644
--- a/2.4/stretch/slim/Dockerfile
+++ b/2.4/stretch/slim/Dockerfile
@@ -6,6 +6,7 @@ RUN apt-get update \
 		ca-certificates \
 		libffi-dev \
 		libgdbm3 \
+		libjemalloc-dev \
 		libssl-dev \
 		libyaml-dev \
 		procps \
@@ -74,6 +75,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -88,6 +90,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/2.5/stretch/Dockerfile b/2.5/stretch/Dockerfile
index 9f30235262..a8c4fde64b 100644
--- a/2.5/stretch/Dockerfile
+++ b/2.5/stretch/Dockerfile
@@ -23,8 +23,11 @@ RUN set -ex \
 		libgdbm-dev \
 		ruby \
 	' \
+	&& runtimeDeps=' \
+	    libjemalloc-dev \
+	' \
 	&& apt-get update \
-	&& apt-get install -y --no-install-recommends $buildDeps \
+	&& apt-get install -y --no-install-recommends $buildDeps $runtimeDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
 	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
@@ -51,6 +54,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -62,6 +66,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/2.5/stretch/slim/Dockerfile b/2.5/stretch/slim/Dockerfile
index c47bc418d5..aea71a7aad 100644
--- a/2.5/stretch/slim/Dockerfile
+++ b/2.5/stretch/slim/Dockerfile
@@ -6,6 +6,7 @@ RUN apt-get update \
 		ca-certificates \
 		libffi-dev \
 		libgdbm3 \
+		libjemalloc-dev \
 		libssl-dev \
 		libyaml-dev \
 		procps \
@@ -74,6 +75,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -88,6 +90,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/2.6-rc/stretch/Dockerfile b/2.6-rc/stretch/Dockerfile
index f4416cbd08..7cbb9dbb64 100644
--- a/2.6-rc/stretch/Dockerfile
+++ b/2.6-rc/stretch/Dockerfile
@@ -23,8 +23,11 @@ RUN set -ex \
 		libgdbm-dev \
 		ruby \
 	' \
+	&& runtimeDeps=' \
+	    libjemalloc-dev \
+	' \
 	&& apt-get update \
-	&& apt-get install -y --no-install-recommends $buildDeps \
+	&& apt-get install -y --no-install-recommends $buildDeps $runtimeDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
 	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
@@ -51,6 +54,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -62,6 +66,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/2.6-rc/stretch/slim/Dockerfile b/2.6-rc/stretch/slim/Dockerfile
index f4ef43f9a2..15b0152ec1 100644
--- a/2.6-rc/stretch/slim/Dockerfile
+++ b/2.6-rc/stretch/slim/Dockerfile
@@ -6,6 +6,7 @@ RUN apt-get update \
 		ca-certificates \
 		libffi-dev \
 		libgdbm3 \
+		libjemalloc-dev \
 		libssl-dev \
 		libyaml-dev \
 		procps \
@@ -74,6 +75,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -88,6 +90,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index 3eb568b968..c4b5e3e12b 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -25,8 +25,11 @@ RUN set -ex \
 		libssl1.0-dev \
 		ruby \
 	' \
+	&& runtimeDeps=' \
+	    libjemalloc-dev \
+	' \
 	&& apt-get update \
-	&& apt-get install -y --no-install-recommends $buildDeps \
+	&& apt-get install -y --no-install-recommends $buildDeps $runtimeDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
 	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
@@ -53,6 +56,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -64,6 +68,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
diff --git a/Dockerfile-slim.template b/Dockerfile-slim.template
index 3c2846a417..ed6e89e31c 100644
--- a/Dockerfile-slim.template
+++ b/Dockerfile-slim.template
@@ -6,6 +6,7 @@ RUN apt-get update \
 		ca-certificates \
 		libffi-dev \
 		libgdbm3 \
+		libjemalloc-dev \
 		libssl-dev \
 		libyaml-dev \
 		procps \
@@ -74,6 +75,7 @@ RUN set -ex \
 		--build="$gnuArch" \
 		--disable-install-doc \
 		--enable-shared \
+		--with-jemalloc \
 	&& make -j "$(nproc)" \
 	&& make install \
 	\
@@ -88,6 +90,9 @@ RUN set -ex \
 	&& gem install bundler --version "$BUNDLER_VERSION" --force \
 	&& rm -r /root/.gem/
 
+# Sanity check for jemalloc
+RUN ruby -r rbconfig -e "abort 'jemalloc not enabled' unless RbConfig::CONFIG['LIBS'].include?('jemalloc')"
+
 # install things globally, for great justice
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle