diff --git a/2.1/Dockerfile b/2.1/Dockerfile
index 87185058f..20fdd4703 100644
--- a/2.1/Dockerfile
+++ b/2.1/Dockerfile
@@ -9,7 +9,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.1
 ENV RUBY_VERSION 2.1.10
-ENV RUBY_DOWNLOAD_SHA256 fb2e454d7a5e5a39eb54db0ec666f53eeb6edc593d1d2b970ae4d150b831dd20
+ENV RUBY_DOWNLOAD_SHA256 5be9f8d5d29d252cd7f969ab7550e31bbb001feb4a83532301c0dd3b5006e148
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -20,17 +20,18 @@ RUN set -ex \
 		bison \
 		libgdbm-dev \
 		ruby \
+		xz-utils \
 	' \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends $buildDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& 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 -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/2.1/alpine/Dockerfile b/2.1/alpine/Dockerfile
index 32821f8ee..a788f8041 100644
--- a/2.1/alpine/Dockerfile
+++ b/2.1/alpine/Dockerfile
@@ -9,7 +9,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.1
 ENV RUBY_VERSION 2.1.10
-ENV RUBY_DOWNLOAD_SHA256 fb2e454d7a5e5a39eb54db0ec666f53eeb6edc593d1d2b970ae4d150b831dd20
+ENV RUBY_DOWNLOAD_SHA256 5be9f8d5d29d252cd7f969ab7550e31bbb001feb4a83532301c0dd3b5006e148
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -42,13 +42,14 @@ RUN set -ex \
 		tar \
 		yaml-dev \
 		zlib-dev \
+		xz \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
+	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
 	\
 	&& mkdir -p /usr/src/ruby \
-	&& tar -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/2.1/slim/Dockerfile b/2.1/slim/Dockerfile
index df5870f62..6565a44ba 100644
--- a/2.1/slim/Dockerfile
+++ b/2.1/slim/Dockerfile
@@ -21,7 +21,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.1
 ENV RUBY_VERSION 2.1.10
-ENV RUBY_DOWNLOAD_SHA256 fb2e454d7a5e5a39eb54db0ec666f53eeb6edc593d1d2b970ae4d150b831dd20
+ENV RUBY_DOWNLOAD_SHA256 5be9f8d5d29d252cd7f969ab7550e31bbb001feb4a83532301c0dd3b5006e148
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -42,17 +42,18 @@ RUN set -ex \
 		make \
 		ruby \
 		wget \
+		xz-utils \
 	' \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends $buildDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& 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 -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/2.2/Dockerfile b/2.2/Dockerfile
index 4d6724608..39977ef16 100644
--- a/2.2/Dockerfile
+++ b/2.2/Dockerfile
@@ -9,7 +9,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.2
 ENV RUBY_VERSION 2.2.6
-ENV RUBY_DOWNLOAD_SHA256 de8e192791cb157d610c48a9a9ff6e7f19d67ce86052feae62b82e3682cc675f
+ENV RUBY_DOWNLOAD_SHA256 9414ecc0d09cf71c9a24e8dc82fcc87919ac7359fb08db2791d6c32bfd157339
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -20,17 +20,18 @@ RUN set -ex \
 		bison \
 		libgdbm-dev \
 		ruby \
+		xz-utils \
 	' \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends $buildDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& 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 -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/2.2/alpine/Dockerfile b/2.2/alpine/Dockerfile
index 6c57a8f76..965b2b0ff 100644
--- a/2.2/alpine/Dockerfile
+++ b/2.2/alpine/Dockerfile
@@ -9,7 +9,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.2
 ENV RUBY_VERSION 2.2.6
-ENV RUBY_DOWNLOAD_SHA256 de8e192791cb157d610c48a9a9ff6e7f19d67ce86052feae62b82e3682cc675f
+ENV RUBY_DOWNLOAD_SHA256 9414ecc0d09cf71c9a24e8dc82fcc87919ac7359fb08db2791d6c32bfd157339
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -42,13 +42,14 @@ RUN set -ex \
 		tar \
 		yaml-dev \
 		zlib-dev \
+		xz \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
+	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
 	\
 	&& mkdir -p /usr/src/ruby \
-	&& tar -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/2.2/slim/Dockerfile b/2.2/slim/Dockerfile
index 953be6398..93925021d 100644
--- a/2.2/slim/Dockerfile
+++ b/2.2/slim/Dockerfile
@@ -21,7 +21,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.2
 ENV RUBY_VERSION 2.2.6
-ENV RUBY_DOWNLOAD_SHA256 de8e192791cb157d610c48a9a9ff6e7f19d67ce86052feae62b82e3682cc675f
+ENV RUBY_DOWNLOAD_SHA256 9414ecc0d09cf71c9a24e8dc82fcc87919ac7359fb08db2791d6c32bfd157339
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -42,17 +42,18 @@ RUN set -ex \
 		make \
 		ruby \
 		wget \
+		xz-utils \
 	' \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends $buildDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& 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 -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/2.3/Dockerfile b/2.3/Dockerfile
index 0cd4499dd..8355b81c7 100644
--- a/2.3/Dockerfile
+++ b/2.3/Dockerfile
@@ -9,7 +9,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.3
 ENV RUBY_VERSION 2.3.3
-ENV RUBY_DOWNLOAD_SHA256 241408c8c555b258846368830a06146e4849a1d58dcaf6b14a3b6a73058115b7
+ENV RUBY_DOWNLOAD_SHA256 1a4fa8c2885734ba37b97ffdb4a19b8fba0e8982606db02d936e65bac07419dc
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -20,17 +20,18 @@ RUN set -ex \
 		bison \
 		libgdbm-dev \
 		ruby \
+		xz-utils \
 	' \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends $buildDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& 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 -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/2.3/alpine/Dockerfile b/2.3/alpine/Dockerfile
index 057336be1..a8e6c0e40 100644
--- a/2.3/alpine/Dockerfile
+++ b/2.3/alpine/Dockerfile
@@ -9,7 +9,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.3
 ENV RUBY_VERSION 2.3.3
-ENV RUBY_DOWNLOAD_SHA256 241408c8c555b258846368830a06146e4849a1d58dcaf6b14a3b6a73058115b7
+ENV RUBY_DOWNLOAD_SHA256 1a4fa8c2885734ba37b97ffdb4a19b8fba0e8982606db02d936e65bac07419dc
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -42,13 +42,14 @@ RUN set -ex \
 		tar \
 		yaml-dev \
 		zlib-dev \
+		xz \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
+	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
 	\
 	&& mkdir -p /usr/src/ruby \
-	&& tar -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/2.3/slim/Dockerfile b/2.3/slim/Dockerfile
index 6caedb747..512a61952 100644
--- a/2.3/slim/Dockerfile
+++ b/2.3/slim/Dockerfile
@@ -21,7 +21,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.3
 ENV RUBY_VERSION 2.3.3
-ENV RUBY_DOWNLOAD_SHA256 241408c8c555b258846368830a06146e4849a1d58dcaf6b14a3b6a73058115b7
+ENV RUBY_DOWNLOAD_SHA256 1a4fa8c2885734ba37b97ffdb4a19b8fba0e8982606db02d936e65bac07419dc
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -42,17 +42,18 @@ RUN set -ex \
 		make \
 		ruby \
 		wget \
+		xz-utils \
 	' \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends $buildDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& 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 -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/2.4/Dockerfile b/2.4/Dockerfile
index 2fbf81571..0d8ac04e4 100644
--- a/2.4/Dockerfile
+++ b/2.4/Dockerfile
@@ -9,7 +9,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.4
 ENV RUBY_VERSION 2.4.0
-ENV RUBY_DOWNLOAD_SHA256 152fd0bd15a90b4a18213448f485d4b53e9f7662e1508190aa5b702446b29e3d
+ENV RUBY_DOWNLOAD_SHA256 3a87fef45cba48b9322236be60c455c13fd4220184ce7287600361319bb63690
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -20,17 +20,18 @@ RUN set -ex \
 		bison \
 		libgdbm-dev \
 		ruby \
+		xz-utils \
 	' \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends $buildDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& 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 -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/2.4/alpine/Dockerfile b/2.4/alpine/Dockerfile
index 73ecaf2b1..d9c0ba278 100644
--- a/2.4/alpine/Dockerfile
+++ b/2.4/alpine/Dockerfile
@@ -9,7 +9,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.4
 ENV RUBY_VERSION 2.4.0
-ENV RUBY_DOWNLOAD_SHA256 152fd0bd15a90b4a18213448f485d4b53e9f7662e1508190aa5b702446b29e3d
+ENV RUBY_DOWNLOAD_SHA256 3a87fef45cba48b9322236be60c455c13fd4220184ce7287600361319bb63690
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -42,13 +42,14 @@ RUN set -ex \
 		tar \
 		yaml-dev \
 		zlib-dev \
+		xz \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
+	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
 	\
 	&& mkdir -p /usr/src/ruby \
-	&& tar -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/2.4/slim/Dockerfile b/2.4/slim/Dockerfile
index 8efedbbc6..bb74aa30e 100644
--- a/2.4/slim/Dockerfile
+++ b/2.4/slim/Dockerfile
@@ -21,7 +21,7 @@ RUN mkdir -p /usr/local/etc \
 
 ENV RUBY_MAJOR 2.4
 ENV RUBY_VERSION 2.4.0
-ENV RUBY_DOWNLOAD_SHA256 152fd0bd15a90b4a18213448f485d4b53e9f7662e1508190aa5b702446b29e3d
+ENV RUBY_DOWNLOAD_SHA256 3a87fef45cba48b9322236be60c455c13fd4220184ce7287600361319bb63690
 ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
@@ -42,17 +42,18 @@ RUN set -ex \
 		make \
 		ruby \
 		wget \
+		xz-utils \
 	' \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends $buildDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
+	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
 	\
 	&& mkdir -p /usr/src/ruby \
-	&& tar -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/Dockerfile-alpine.template b/Dockerfile-alpine.template
index 5e659654f..8880bad53 100644
--- a/Dockerfile-alpine.template
+++ b/Dockerfile-alpine.template
@@ -42,13 +42,14 @@ RUN set -ex \
 		tar \
 		yaml-dev \
 		zlib-dev \
+		xz \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& 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 -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/Dockerfile-slim.template b/Dockerfile-slim.template
index 72515f246..d0b68f2a6 100644
--- a/Dockerfile-slim.template
+++ b/Dockerfile-slim.template
@@ -42,17 +42,18 @@ RUN set -ex \
 		make \
 		ruby \
 		wget \
+		xz-utils \
 	' \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends $buildDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& 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 -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/Dockerfile.template b/Dockerfile.template
index a73e72ebc..6188aab0b 100644
--- a/Dockerfile.template
+++ b/Dockerfile.template
@@ -20,17 +20,18 @@ RUN set -ex \
 		bison \
 		libgdbm-dev \
 		ruby \
+		xz-utils \
 	' \
 	&& apt-get update \
 	&& apt-get install -y --no-install-recommends $buildDeps \
 	&& rm -rf /var/lib/apt/lists/* \
 	\
-	&& wget -O ruby.tar.gz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.gz" \
-	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.gz" | sha256sum -c - \
+	&& 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 -xzf ruby.tar.gz -C /usr/src/ruby --strip-components=1 \
-	&& rm ruby.tar.gz \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
 	\
 	&& cd /usr/src/ruby \
 	\
diff --git a/update.sh b/update.sh
index e6a8b7898..b5869ec4c 100755
--- a/update.sh
+++ b/update.sh
@@ -8,7 +8,7 @@ if [ ${#versions[@]} -eq 0 ]; then
 	versions=( */ )
 fi
 versions=( "${versions[@]%/}" )
-shaPage=$(curl -fsSL 'https://www.ruby-lang.org/en/downloads/' | tr '\r\n' ' ')
+releasePage=$(curl -fsSL 'https://www.ruby-lang.org/en/downloads/releases/' | tr '\r\n' ' ')
 
 latest_gem_version() {
 	curl -sSL "https://rubygems.org/api/v1/gems/$1.json" | sed -r 's/^.*"version":"([^"]+)".*$/\1/'
@@ -35,7 +35,7 @@ for version in "${versions[@]}"; do
 
 	fullVersion=
 	for tryVersion in "${allVersions[@]}"; do
-		if echo "$shaPage" | grep -q "Ruby ${tryVersion}<"; then
+		if echo "$releasePage" | grep -q "Ruby ${tryVersion}<"; then
 			fullVersion="$tryVersion"
 			break
 		fi
@@ -45,7 +45,8 @@ for version in "${versions[@]}"; do
 		echo >&2 "warning: cannot determine sha for $version (tried all of ${allVersions[*]}); skipping"
 		continue
 	fi
-	shaVal="$(echo "$shaPage" | sed -r "s/.*Ruby ${fullVersion}<\/a><br \/>\s*sha256: ([^<]+).*/\1/")"
+	versionReleasePage="$(curl -fsSL 'https://www.ruby-lang.org/en/downloads/releases/' | grep "<td>Ruby $fullVersion</td>" -A 2 | awk -F'"' '{print $2}' | xargs)"
+	shaVal="$(curl -fsSL "https://www.ruby-lang.org/$versionReleasePage" | grep "ruby-$fullVersion.tar.xz" -A 5 | grep SHA256 | awk '{print $2}')"
 
 	sedStr="
 		s!%%VERSION%%!$version!g;