diff --git a/aarch64-linux-deb9/Dockerfile b/aarch64-linux-deb9/Dockerfile
index 2ae608105190bc3ae66b001547bad1e0d2ff56db..e481de5ee532302acee133283be2eb20ef4a3b0d 100644
--- a/aarch64-linux-deb9/Dockerfile
+++ b/aarch64-linux-deb9/Dockerfile
@@ -19,16 +19,15 @@ RUN apt-get update \
 ENV BOOT_LLVM_DIR /opt/llvm-bootstrap
 ENV BOOT_LLVM_VERSION 7.0.0
 ENV PATH /usr/local/bin:$PATH
-RUN curl http://releases.llvm.org/$BOOT_LLVM_VERSION/clang+llvm-$BOOT_LLVM_VERSION-aarch64-linux-gnu.tar.xz | tar -xJC . && \
+RUN curl -L http://releases.llvm.org/$BOOT_LLVM_VERSION/clang+llvm-$BOOT_LLVM_VERSION-aarch64-linux-gnu.tar.xz | tar -xJC . && \
     mkdir $BOOT_LLVM_DIR && \
     cp -R clang+llvm*/* $BOOT_LLVM_DIR && \
     rm -R clang+llvm* && \
     $BOOT_LLVM_DIR/bin/llc --version
 
 # GHC
-# Use 8.8.1 to bootstrap, since earlier releases are especially buggy on AArch64
-ENV GHC_VERSION 8.8.1
-RUN curl http://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-aarch64-deb9-linux.tar.xz | tar -xJ
+ENV GHC_VERSION 8.8.3
+RUN curl -L http://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-aarch64-deb9-linux.tar.xz | tar -xJ
 WORKDIR /ghc-$GHC_VERSION
 RUN ./configure --prefix=/usr/local LLC=$BOOT_LLVM_DIR/bin/llc OPT=$BOOT_LLVM_DIR/bin/opt && \
     make install
@@ -40,7 +39,7 @@ RUN ghc --version
 ENV LLVM_DIR /opt/llvm
 ENV LLVM_VERSION 9.0.0
 ENV PATH $LLVM_DIR/bin:$PATH
-RUN curl http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-aarch64-linux-gnu.tar.xz | tar -xJC . && \
+RUN curl -L http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-aarch64-linux-gnu.tar.xz | tar -xJC . && \
     mkdir $LLVM_DIR && \
     cp -R clang+llvm*/* $LLVM_DIR && \
     rm -R clang+llvm* && \
@@ -48,13 +47,7 @@ RUN curl http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-aarch64
 
 # Cabal
 ENV CABAL_VERSION 3.0.0.0
-#RUN git clone https://github.com/haskell/Cabal
-#WORKDIR /Cabal
-#RUN git checkout cabal-install-v$CABAL_VERSION
-#WORKDIR /Cabal/cabal-install
-#RUN EXTRA_CONFIGURE_OPTS=--disable-optimization ./bootstrap.sh --global --no-doc
-#RUN ls /Cabal/cabal-install/dist/build
-RUN curl http://home.smart-cactus.org/~ben/ghc/cabal-install-$CABAL_VERSION-aarch64-debian9-linux.tar.xz | tar -Jx && \
+RUN curl -L http://home.smart-cactus.org/~ben/ghc/cabal-install-$CABAL_VERSION-aarch64-debian9-linux.tar.xz | tar -Jx && \
     mv cabal /usr/local/bin/cabal
 
 ENV PATH /home/ghc/.local/bin:/opt/ghc/$GHC_VERSION/bin:$PATH
diff --git a/armv7-linux-deb9/Dockerfile b/armv7-linux-deb9/Dockerfile
index fb3627d093565e382986bf17a430304fa70ed9c8..122ade6aae4728a3a6ee832a1d54fbae171b8c85 100644
--- a/armv7-linux-deb9/Dockerfile
+++ b/armv7-linux-deb9/Dockerfile
@@ -20,16 +20,15 @@ RUN apt-get update \
 ENV BOOT_LLVM_DIR /opt/llvm-bootstrap
 ENV BOOT_LLVM_VERSION 7.0.0
 ENV PATH /usr/local/bin:$PATH
-RUN curl http://releases.llvm.org/$BOOT_LLVM_VERSION/clang+llvm-$BOOT_LLVM_VERSION-armv7a-linux-gnueabihf.tar.xz | tar -xJC . && \
+RUN curl -L http://releases.llvm.org/$BOOT_LLVM_VERSION/clang+llvm-$BOOT_LLVM_VERSION-armv7a-linux-gnueabihf.tar.xz | tar -xJC . && \
     mkdir $BOOT_LLVM_DIR && \
     cp -R clang+llvm*/* $BOOT_LLVM_DIR && \
     rm -R clang+llvm* && \
     $BOOT_LLVM_DIR/bin/llc --version
 
 # GHC
-# Use 8.8.1 to bootstrap, since earlier releases are especially buggy on AArch64
-ENV GHC_VERSION 8.8.1
-RUN curl https://downloads.haskell.org/ghc/$GHC_VERSION/ghc-$GHC_VERSION-armv7l-deb9-linux.tar.xz | tar -xJ
+ENV GHC_VERSION 8.8.3
+RUN curl -L https://downloads.haskell.org/ghc/$GHC_VERSION/ghc-$GHC_VERSION-armv7l-deb9-linux.tar.xz | tar -xJ
 WORKDIR /ghc-$GHC_VERSION
 RUN ./configure --prefix=/usr/local LLC=$BOOT_LLVM_DIR/bin/llc OPT=$BOOT_LLVM_DIR/bin/opt && \
     make install
@@ -41,7 +40,7 @@ RUN ghc --version
 ENV LLVM_DIR /opt/llvm
 ENV LLVM_VERSION 9.0.0
 ENV PATH $LLVM_DIR/bin:$PATH
-RUN curl http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-armv7a-linux-gnueabihf.tar.xz | tar -xJC . && \
+RUN curl -L http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-armv7a-linux-gnueabihf.tar.xz | tar -xJC . && \
     mkdir $LLVM_DIR && \
     cp -R clang+llvm*/* $LLVM_DIR && \
     rm -R clang+llvm* && \
@@ -49,13 +48,7 @@ RUN curl http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-armv7a-
 
 # Cabal
 ENV CABAL_VERSION 3.0.0.0
-#RUN git clone https://github.com/haskell/Cabal
-#WORKDIR /Cabal
-#RUN git checkout cabal-install-v$CABAL_VERSION
-#WORKDIR /Cabal/cabal-install
-#RUN EXTRA_CONFIGURE_OPTS=--disable-optimization ./bootstrap.sh --global --no-doc
-#RUN ls /Cabal/cabal-install/dist/build
-RUN curl http://home.smart-cactus.org/~ben/ghc/cabal-install-$CABAL_VERSION-armv7l-debian9-linux.tar.xz | tar -Jx && \
+RUN curl -L http://home.smart-cactus.org/~ben/ghc/cabal-install-$CABAL_VERSION-armv7l-debian9-linux.tar.xz | tar -Jx && \
     mv cabal /usr/local/bin/cabal
 
 ENV PATH /home/ghc/.local/bin:/opt/ghc/$GHC_VERSION/bin:$PATH
diff --git a/i386-linux-deb9/Dockerfile b/i386-linux-deb9/Dockerfile
index 312b5b27b3ef868111bc9d6499f2cdb010d13e31..97c6037fe3e9ad59d628054996b2a06a3a912d0b 100644
--- a/i386-linux-deb9/Dockerfile
+++ b/i386-linux-deb9/Dockerfile
@@ -20,8 +20,8 @@ RUN apt-get update -qq \
 
 WORKDIR /tmp
 # Get i386 GHC bindist for 32 bit CI builds.
-ENV GHC_VERSION 8.6.5
-RUN curl https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-i386-deb9-linux.tar.xz | tar -Jx;
+ENV GHC_VERSION 8.8.3
+RUN curl -L https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-i386-deb9-linux.tar.xz | tar -Jx;
 WORKDIR /tmp/ghc-$GHC_VERSION
 RUN setarch i386 ./configure --prefix=/opt/ghc-i386/$GHC_VERSION CFLAGS=-m32 --target=i386-unknown-linux --build=i386-unknown-linux --host=i386-unknown-linux; \
     make install; \
@@ -30,8 +30,8 @@ ENV PATH /opt/ghc-i386/$GHC_VERSION/bin:$PATH
 
 WORKDIR /tmp
 # Get Cabal
-ENV CABAL_VERSION 2.4.1.0
-RUN curl https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-i386-unknown-linux.tar.xz | tar -Jx && \
+ENV CABAL_VERSION 3.0.0.0
+RUN curl -L https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-i386-unknown-linux.tar.xz | tar -Jx && \
     mv cabal /usr/local/bin/cabal
 
 # Create a normal user.
diff --git a/linters/Dockerfile b/linters/Dockerfile
index 279b75c66fc4a12011f52d9916527c06a4a9a7eb..e866b29090c56e409959e3d3ba0241f24e230bd0 100644
--- a/linters/Dockerfile
+++ b/linters/Dockerfile
@@ -32,8 +32,8 @@ RUN apt-get update -qq && apt-get install --no-install-recommends -qy \
 
 WORKDIR /tmp
 # Install GHC and cabal
-ENV GHC_VERSION 8.6.5
-RUN curl https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-deb9-linux.tar.xz | tar -Jx;
+ENV GHC_VERSION 8.8.3
+RUN curl -L https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-deb9-linux.tar.xz | tar -Jx;
 WORKDIR /tmp/ghc-$GHC_VERSION
 RUN ./configure --prefix=/opt/ghc/$GHC_VERSION; \
     make install;
@@ -43,15 +43,15 @@ RUN rm -rf /tmp/ghc-$GHC_VERSION
 ENV PATH /opt/ghc/$GHC_VERSION/bin:$PATH
 
 # Get Cabal
-ENV CABAL_VERSION 2.4.1.0
-RUN curl https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
+ENV CABAL_VERSION 3.0.0.0
+RUN curl -L https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
     mv cabal /usr/local/bin/cabal
 
 # LLVM
 ENV LLVM_DIR /opt/llvm
 ENV LLVM_VERSION 9.0.0
 ENV PATH $LLVM_DIR/bin:$PATH
-RUN curl http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-x86_64-linux-gnu-ubuntu-16.04.tar.xz | tar -xJC .; \
+RUN curl -L http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-x86_64-linux-gnu-ubuntu-16.04.tar.xz | tar -xJC .; \
     mkdir $LLVM_DIR && \
     cp -R clang+llvm*/* $LLVM_DIR && \
     rm -R clang+llvm* && \
@@ -77,7 +77,7 @@ RUN pip3 install mypy==0.701
 USER ghc
 
 RUN cabal update
-ENV LINTER_COMMIT 265c74fb4f5a341e23dbe2d89a87a5a2516bf3e8
+ENV LINTER_COMMIT b5650c094c98daec9416ceac92ca2cf3c099640f
 RUN git clone https://gitlab.haskell.org/ghc/git-haskell-org-hooks && \
     git -C git-haskell-org-hooks checkout $LINTER_COMMIT
 WORKDIR /home/ghc/git-haskell-org-hooks
diff --git a/x86_64-freebsd/build-toolchain.sh b/x86_64-freebsd/build-toolchain.sh
index e7744d03285a76af17779bafb5e603963597686b..778c76b08911b6269cc3c0ddd2f45b57f1826e29 100755
--- a/x86_64-freebsd/build-toolchain.sh
+++ b/x86_64-freebsd/build-toolchain.sh
@@ -11,7 +11,7 @@ mkdir binutils
 cd binutils
 
 # Build binutils for target platform.
-curl https://ftp.gnu.org/gnu/binutils/binutils-$BINUTILS.tar.bz2 | tar xjf -
+curl -L https://ftp.gnu.org/gnu/binutils/binutils-$BINUTILS.tar.bz2 | tar xjf -
 
 mkdir binutils-build
 cd binutils-build
@@ -32,9 +32,9 @@ case "$ARCH" in
 	FREEBSD_ARCH=i386
     ;;
 esac
-    
+
 URL=https://download.freebsd.org/ftp/releases/$FREEBSD_ARCH/$FREEBSD/base.txz
-curl $URL | tar xJf - -C freebsd ./usr/include ./usr/lib ./lib
+curl -L $URL | tar xJf - -C freebsd ./usr/include ./usr/lib ./lib
 
 dst=/usr/local/$ARCH-unknown-freebsd10
 
@@ -58,7 +58,7 @@ cp freebsd/lib/libncursesw.so.8 $dst/lib
 
 # Install iconv port in target env.
 URL_ICONV=http://pkg.freebsd.org/FreeBSD:11:$FREEBSD_ARCH/latest/All/libiconv-1.14_11.txz
-curl $URL_ICONV | tar xJf - -C freebsd
+curl -L $URL_ICONV | tar xJf - -C freebsd
 cp -r freebsd/usr/local/include $dst/
 cp -d freebsd/usr/local/lib/* $dst/lib
 
@@ -75,7 +75,7 @@ rm -rf freebsd
 # Build gcc for target platform.
 mkdir gcc
 cd gcc
-curl https://ftp.gnu.org/gnu/gcc/gcc-$GCC/gcc-$GCC.tar.gz | tar xzf -
+curl -L https://ftp.gnu.org/gnu/gcc/gcc-$GCC/gcc-$GCC.tar.gz | tar xzf -
 cd gcc-$GCC
 ./contrib/download_prerequisites
 
diff --git a/x86_64-linux-alpine/Dockerfile b/x86_64-linux-alpine/Dockerfile
index 12abb8d4e47efef2370d479799446fb47095a885..a135960340da2083e85dbf219d5588c3d11575ac 100644
--- a/x86_64-linux-alpine/Dockerfile
+++ b/x86_64-linux-alpine/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.10.2
+FROM alpine:3.11.5
 
 SHELL ["/bin/ash", "-eo", "pipefail", "-c"]
 
@@ -6,33 +6,38 @@ RUN echo "Installing GHC build dependencies..." && \
     apk add --no-cache \
         autoconf=~2.69 \
         automake=~1.16 \
-        binutils-gold=~2.32 \
+        binutils-gold=~2.33 \
         build-base=~0.5 \
         coreutils=~8.31 \
-        cpio=~2.12 \
+        cpio=~2.13 \
         linux-headers=~4.19 \
         libffi-dev=~3.2 \
         musl-dev=~1 \
         ncurses-dev=~6.1 \
-        python3=~3.7 \
-        py3-sphinx=~1.8 \
+        python3=~3.8 \
+        py3-sphinx=~2.2 \
         zlib-dev=~1.2 \
         xz=~5.2 \
         bash=~5.0 \
-        git=~2.22 \
+        git=~2.24 \
         wget=~1.20 \
         sudo=~1.8 \
         grep=~3 \
-        curl=~7.66 \
+        curl=~7.67 \
         gmp-dev=~6.1 \
-        cabal=~2.4
+        cabal=~2.4 \
+        ghc=~8.6
 
 WORKDIR /tmp
 # Install GHC
-ENV GHC_VERSION 8.6.5
+ENV GHC_VERSION 8.8.3
 # NB: This is not an official bindist, but rather an alternative bindist taken
 #     from https://github.com/redneb/ghc-alt-libc.
 RUN curl -L https://github.com/redneb/ghc-alt-libc/releases/download/ghc-$GHC_VERSION-musl/ghc-$GHC_VERSION-x86_64-unknown-linux-musl.tar.xz | tar -Jx;
+# The ghc-alt-libc bindist requires libtinfow.so.6, so symlink what Alpine
+# provides. This hack can likely be removed when we start using GHC's native
+# Alpine bindists in the future.
+RUN ln -s /usr/lib/libncursesw.so.6 /usr/lib/libtinfow.so.6
 WORKDIR /tmp/ghc-$GHC_VERSION
 RUN ./configure --disable-ld-override --prefix=/opt/ghc/$GHC_VERSION; \
     make install;
@@ -47,10 +52,15 @@ RUN echo "ghc ALL = NOPASSWD : ALL" > /etc/sudoers.d/ghc
 USER ghc
 WORKDIR /home/ghc/
 
-# Build Haskell tools
+# Install cabal
+ENV BOOT_GHC /usr/bin/ghc
 RUN cabal v2-update && \
-    cabal v2-install hscolour happy alex --constraint 'happy ^>= 1.19.10'
+    cabal v2-install cabal-install --constraint 'cabal-install ^>= 3.0' -w $BOOT_GHC
 ENV PATH /home/ghc/.cabal/bin:$PATH
+
+# Build Haskell tools
+RUN cabal user-config update && \
+    cabal v2-install hscolour happy alex --constraint 'happy ^>= 1.19.10'
 ENV SPHINXBUILD /usr/bin/sphinx-build-3
 
 CMD ["bash"]
diff --git a/x86_64-linux-centos7/Dockerfile b/x86_64-linux-centos7/Dockerfile
index 800b2a9ce6d39b9862442f5060a4a3c0c457aecc..d9acfb17273e9b46e4e5e877895db35eba744bbb 100644
--- a/x86_64-linux-centos7/Dockerfile
+++ b/x86_64-linux-centos7/Dockerfile
@@ -32,8 +32,8 @@ RUN sed -i -e 's/systemd//g' /etc/nsswitch.conf
 
 WORKDIR /tmp
 # Install GHC and cabal
-ENV GHC_VERSION 8.6.5
-RUN curl https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-centos7-linux.tar.xz | tar -Jx
+ENV GHC_VERSION 8.8.3
+RUN curl -L https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-centos7-linux.tar.xz | tar -Jx
 WORKDIR /tmp/ghc-$GHC_VERSION
 RUN ./configure --prefix=/opt/ghc/$GHC_VERSION && make install
 
@@ -43,8 +43,8 @@ ENV PATH /opt/ghc/$GHC_VERSION/bin:$PATH
 
 WORKDIR /tmp
 # Get Cabal
-ENV CABAL_VERSION 2.4.1.0
-RUN curl https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
+ENV CABAL_VERSION 3.0.0.0
+RUN curl -L https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
     mv cabal /usr/local/bin/cabal
 
 # Create a normal user.
diff --git a/x86_64-linux-deb10/Dockerfile b/x86_64-linux-deb10/Dockerfile
index 3ec05790517cbf7f95e0402628df65ca00791877..8304f26a0591d4508dd808cb4bc300c996103c25 100644
--- a/x86_64-linux-deb10/Dockerfile
+++ b/x86_64-linux-deb10/Dockerfile
@@ -33,8 +33,8 @@ RUN apt-get update -qq && apt-get install --no-install-recommends -qy \
 WORKDIR /tmp
 # Install GHC and cabal
 ENV GHC_VERSION 8.8.1
-#RUN curl https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-fedora27-linux.tar.xz | tar -Jx;
-RUN curl http://home.smart-cactus.org/~ben/ghc/release-prep/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-deb10-linux.tar.xz | tar -Jx;
+#RUN curl -L https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-deb10-linux.tar.xz | tar -Jx;
+RUN curl -L http://home.smart-cactus.org/~ben/ghc/release-prep/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-deb10-linux.tar.xz | tar -Jx;
 WORKDIR /tmp/ghc-$GHC_VERSION
 RUN ./configure --prefix=/opt/ghc/$GHC_VERSION; \
     make install;
@@ -44,15 +44,15 @@ RUN rm -rf /tmp/ghc-$GHC_VERSION
 ENV PATH /opt/ghc/$GHC_VERSION/bin:$PATH
 
 # Get Cabal
-ENV CABAL_VERSION 2.4.1.0
-RUN curl https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
+ENV CABAL_VERSION 3.0.0.0
+RUN curl -L https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
     mv cabal /usr/local/bin/cabal
 
 # LLVM
 ENV LLVM_DIR /opt/llvm
 ENV LLVM_VERSION 7.0.0
 ENV PATH $LLVM_DIR/bin:$PATH
-RUN curl http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-x86_64-linux-gnu-ubuntu-16.04.tar.xz | tar -xJC .; \
+RUN curl -L http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-x86_64-linux-gnu-ubuntu-16.04.tar.xz | tar -xJC .; \
     mkdir $LLVM_DIR && \
     cp -R clang+llvm*/* $LLVM_DIR && \
     rm -R clang+llvm* && \
diff --git a/x86_64-linux-deb8/Dockerfile b/x86_64-linux-deb8/Dockerfile
index a3c17266d17befcdf083cfc19165d99862f75a06..c26b3aea018bc831c2a8930b0638ab3bf405896e 100644
--- a/x86_64-linux-deb8/Dockerfile
+++ b/x86_64-linux-deb8/Dockerfile
@@ -18,8 +18,8 @@ RUN apt-get update -qq && apt-get install --no-install-recommends -qy zlib1g-dev
 
 WORKDIR /tmp
 # Install GHC and cabal
-ENV GHC_VERSION 8.6.5
-RUN curl https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-deb8-linux.tar.xz | tar -Jx;
+ENV GHC_VERSION 8.8.3
+RUN curl -L https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-deb8-linux.tar.xz | tar -Jx;
 WORKDIR /tmp/ghc-$GHC_VERSION
 RUN ./configure --prefix=/opt/ghc/$GHC_VERSION; \
     make install;
@@ -29,8 +29,8 @@ RUN rm -rf /tmp/ghc-$GHC_VERSION
 ENV PATH /opt/ghc/$GHC_VERSION/bin:$PATH
 
 # Get Cabal
-ENV CABAL_VERSION 2.4.1.0
-RUN curl https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
+ENV CABAL_VERSION 3.0.0.0
+RUN curl -L https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
     mv cabal /usr/local/bin/cabal
 
 # Create a normal user.
diff --git a/x86_64-linux-deb9/Dockerfile b/x86_64-linux-deb9/Dockerfile
index d54236deb4ec2db0f0aa2a9a83c4c4ddcfd831b6..611c838689c8a2d15e578a1fa24a382dc65ce542 100644
--- a/x86_64-linux-deb9/Dockerfile
+++ b/x86_64-linux-deb9/Dockerfile
@@ -32,8 +32,8 @@ RUN apt-get update -qq && apt-get install --no-install-recommends -qy \
 
 WORKDIR /tmp
 # Install GHC and cabal
-ENV GHC_VERSION 8.6.5
-RUN curl https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-deb9-linux.tar.xz | tar -Jx;
+ENV GHC_VERSION 8.8.3
+RUN curl -L https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-deb9-linux.tar.xz | tar -Jx;
 WORKDIR /tmp/ghc-$GHC_VERSION
 RUN ./configure --prefix=/opt/ghc/$GHC_VERSION; \
     make install;
@@ -43,15 +43,15 @@ RUN rm -rf /tmp/ghc-$GHC_VERSION
 ENV PATH /opt/ghc/$GHC_VERSION/bin:$PATH
 
 # Get Cabal
-ENV CABAL_VERSION 2.4.1.0
-RUN curl https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
+ENV CABAL_VERSION 3.0.0.0
+RUN curl -L https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
     mv cabal /usr/local/bin/cabal
 
 # LLVM
 ENV LLVM_DIR /opt/llvm
 ENV LLVM_VERSION 9.0.0
 ENV PATH $LLVM_DIR/bin:$PATH
-RUN curl http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-x86_64-linux-gnu-ubuntu-16.04.tar.xz | tar -xJC .; \
+RUN curl -L http://releases.llvm.org/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-x86_64-linux-gnu-ubuntu-16.04.tar.xz | tar -xJC .; \
     mkdir $LLVM_DIR && \
     cp -R clang+llvm*/* $LLVM_DIR && \
     rm -R clang+llvm* && \
diff --git a/x86_64-linux-fedora27/Dockerfile b/x86_64-linux-fedora27/Dockerfile
index 185b6e9edf7199813206969b8f4ff688eea7c7cb..e08be395f5577c189689f1fd653a880ad7fa44b8 100644
--- a/x86_64-linux-fedora27/Dockerfile
+++ b/x86_64-linux-fedora27/Dockerfile
@@ -32,8 +32,8 @@ RUN sed -i -e 's/systemd//g' /etc/nsswitch.conf
 
 WORKDIR /tmp
 # Install GHC and cabal
-ENV GHC_VERSION 8.6.5
-RUN curl https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-fedora27-linux.tar.xz | tar -Jx;
+ENV GHC_VERSION 8.8.3
+RUN curl -L https://downloads.haskell.org/~ghc/$GHC_VERSION/ghc-$GHC_VERSION-x86_64-fedora27-linux.tar.xz | tar -Jx;
 WORKDIR /tmp/ghc-$GHC_VERSION
 RUN ./configure --prefix=/opt/ghc/$GHC_VERSION; \
     make install; \
@@ -42,8 +42,8 @@ ENV PATH /opt/ghc/$GHC_VERSION/bin:$PATH
 
 WORKDIR /tmp
 # Get Cabal
-ENV CABAL_VERSION 2.4.1.0
-RUN curl https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
+ENV CABAL_VERSION 3.0.0.0
+RUN curl -L https://downloads.haskell.org/cabal/cabal-install-$CABAL_VERSION/cabal-install-$CABAL_VERSION-x86_64-unknown-linux.tar.xz | tar -Jx && \
     mv cabal /usr/local/bin/cabal
 
 # Create a normal user.