diff --git a/.github/workflows/workflow.yaml b/.github/workflows/workflow.yaml
index 9e2fdc0..a00607d 100644
--- a/.github/workflows/workflow.yaml
+++ b/.github/workflows/workflow.yaml
@@ -3,14 +3,15 @@ on: push
 jobs:
   image:
     strategy:
+      fail-fast: false
       matrix:
-        arch:
-          - amd64
-          - arm64
-        ghc:
-          - 9.0.2
-          - 9.2.4
-          - 9.4.2
+        include:
+          - { arch: amd64, ghc: 9.0.2, hls: 1.8.0.0 }
+          - { arch: arm64, ghc: 9.0.2, hls: 1.8.0.0 }
+          - { arch: amd64, ghc: 9.2.5, hls: 85f788135175a007d3db4ac911c4115b30ab9d87 }
+          - { arch: arm64, ghc: 9.2.5, hls: 85f788135175a007d3db4ac911c4115b30ab9d87 }
+          - { arch: amd64, ghc: 9.4.3, hls: 85f788135175a007d3db4ac911c4115b30ab9d87 }
+          - { arch: arm64, ghc: 9.4.3, hls: 85f788135175a007d3db4ac911c4115b30ab9d87 }
     runs-on: ubuntu-latest
     steps:
 
@@ -24,9 +25,10 @@ jobs:
         with:
           project-name: docker-haskell-${{ matrix.arch }}
           buildspec-override: aws/image.yaml
-          env-vars-for-codebuild: GHC_VERSION
+          env-vars-for-codebuild: GHC_VERSION,HLS_VERSION
         env:
           GHC_VERSION: ${{ matrix.ghc }}
+          HLS_VERSION: ${{ matrix.hls }}
 
   manifest:
     needs: image
@@ -34,8 +36,8 @@ jobs:
       matrix:
         ghc:
           - 9.0.2
-          - 9.2.4
-          - 9.4.2
+          - 9.2.5
+          - 9.4.3
     runs-on: ubuntu-latest
     steps:
 
diff --git a/Dockerfile b/Dockerfile
index 7c75dd0..d203919 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -47,20 +47,20 @@ ARG GHCUP_VERSION=0.1.18.0
 RUN \
   set -o errexit -o xtrace; \
   if test -n "$GHCUP_VERSION"; then \
-  curl --output ~/.ghcup/bin/ghcup "https://downloads.haskell.org/ghcup/$GHCUP_VERSION/$( uname --machine )-linux-ghcup-$GHCUP_VERSION"; \
-  chmod --verbose +x ~/.ghcup/bin/ghcup; \
-  ghcup --version; \
+    curl --output ~/.ghcup/bin/ghcup "https://downloads.haskell.org/ghcup/$GHCUP_VERSION/$( uname --machine )-linux-ghcup-$GHCUP_VERSION"; \
+    chmod --verbose +x ~/.ghcup/bin/ghcup; \
+    ghcup --version; \
   fi
 
 # Install GHC.
 
-ARG GHC_VERSION=9.4.2
+ARG GHC_VERSION=9.0.2
 RUN \
   set -o errexit -o xtrace; \
   if test -n "$GHC_VERSION"; then \
-  ghcup install ghc "$GHC_VERSION" --set; \
-  ghcup gc --profiling-libs --share-dir; \
-  ghc --version; \
+    ghcup install ghc "$GHC_VERSION" --set; \
+    ghcup gc --profiling-libs --share-dir; \
+    ghc --version; \
   fi
 
 # Install Cabal.
@@ -69,56 +69,61 @@ ARG CABAL_VERSION=3.8.1.0
 RUN \
   set -o errexit -o xtrace; \
   if test -n "$CABAL_VERSION"; then \
-  ghcup install cabal "$CABAL_VERSION" --set; \
-  cabal --version; \
+    ghcup install cabal "$CABAL_VERSION" --set; \
+    cabal --version; \
   fi
 
-# Install Stack.
+# Configure Cabal.
 
-ARG STACK_VERSION=2.9.1
+ARG CABAL_STORE=/cabal-store
 RUN \
   set -o errexit -o xtrace; \
-  if test -n "$STACK_VERSION"; then \
-  ghcup install stack "$STACK_VERSION" --set; \
-  stack --version; \
+  if command -v cabal; then \
+    sudo mkdir --mode 0775 --parents --verbose "$CABAL_STORE"; \
+    sudo chown --verbose "$USER_NAME" "$CABAL_STORE"; \
+    sudo chgrp --verbose sudo "$CABAL_STORE"; \
+    cabal user-config init --augment "store-dir: $CABAL_STORE"; \
   fi
 
-# Install HLS.
+# Install Stack.
 
-ARG HLS_VERSION=1.8.0.0
+ARG STACK_VERSION=2.9.1
 RUN \
   set -o errexit -o xtrace; \
-  if test -n "$HLS_VERSION"; then \
-  ghcup install hls "$HLS_VERSION" --set; \
-  ghcup gc --hls-no-ghc; \
-  haskell-language-server-wrapper --version; \
+  if test -n "$STACK_VERSION"; then \
+    ghcup install stack "$STACK_VERSION" --set; \
+    stack --version; \
   fi
 
-# Configure Cabal.
+# Configure Stack.
 
-ARG CABAL_STORE=/cabal-store
+ARG STACK_ROOT=/stack-root
 RUN \
   set -o errexit -o xtrace; \
-  if command -v cabal; then \
-  sudo mkdir --mode 0775 --parents --verbose "$CABAL_STORE"; \
-  sudo chown --verbose "$USER_NAME" "$CABAL_STORE"; \
-  sudo chgrp --verbose sudo "$CABAL_STORE"; \
-  cabal user-config init --augment "store-dir: $CABAL_STORE"; \
+  if command -v stack; then \
+    sudo mkdir --mode 0775 --parents --verbose "$STACK_ROOT"; \
+    sudo chown --verbose "$USER_NAME" "$STACK_ROOT"; \
+    sudo chgrp --verbose sudo "$STACK_ROOT"; \
+    stack config set install-ghc --global false; \
+    stack config set system-ghc --global true; \
   fi
+ENV STACK_ROOT="$STACK_ROOT"
 
-# Configure Stack.
+# Install HLS.
 
-ARG STACK_ROOT=/stack-root
+ARG HLS_VERSION=1.8.0.0
 RUN \
   set -o errexit -o xtrace; \
-  if command -v stack; then \
-  sudo mkdir --mode 0775 --parents --verbose "$STACK_ROOT"; \
-  sudo chown --verbose "$USER_NAME" "$STACK_ROOT"; \
-  sudo chgrp --verbose sudo "$STACK_ROOT"; \
-  stack config set install-ghc --global false; \
-  stack config set system-ghc --global true; \
+  if test -n "$HLS_VERSION"; then \
+    if echo "$HLS_VERSION" | grep --extended-regexp --quiet '^[0-9a-f]{40}$'; then \
+      ghcup --verbose compile hls --cabal-update --ghc "$GHC_VERSION" --git-describe-version --git-ref "$HLS_VERSION" -- --flags=-dynamic --ghc-options='+RTS -M2G -RTS' --index-state='2022-11-11T21:44:45Z'; \
+    else \
+      ghcup install hls "$HLS_VERSION" --set; \
+    fi; \
+    ghcup gc --cache --hls-no-ghc --tmpdirs; \
+    rm --force --recursive --verbose /cabal-store/* ~/.cabal/{logs,packages,store}; \
+    haskell-language-server-wrapper --version; \
   fi
-ENV STACK_ROOT="$STACK_ROOT"
 
 # Configure volumes.
 
diff --git a/aws/image.yaml b/aws/image.yaml
index eaf21e2..44a135f 100644
--- a/aws/image.yaml
+++ b/aws/image.yaml
@@ -5,7 +5,10 @@ env:
     DOCKER_USERNAME: docker-hub-read-only:DOCKER_USERNAME
   variables:
     AWS_REGION: us-east-1
-    GHC_VERSION: 9.2.4
+    # These values are simply the defaults. They are typically overriden by
+    # the workflow in `.github/workflows/workflow.yaml`.
+    GHC_VERSION: 9.0.2
+    HLS_VERSION: 1.8.0.0
 phases:
   build:
     commands:
@@ -24,6 +27,6 @@ phases:
 
       - echo "$tag"
 
-      - docker build --build-arg GHC_VERSION="$GHC_VERSION" --tag "$tag" .
+      - docker build --build-arg GHC_VERSION="$GHC_VERSION" --build-arg HLS_VERSION="$HLS_VERSION" --tag "$tag" .
 
       - docker push "$tag"
diff --git a/aws/manifest.yaml b/aws/manifest.yaml
index 979d287..360a8d2 100644
--- a/aws/manifest.yaml
+++ b/aws/manifest.yaml
@@ -2,7 +2,9 @@ version: 0.2
 env:
   variables:
     AWS_REGION: us-east-1
-    GHC_VERSION: 9.2.4
+    # This value is simply the default. It is typically overriden by the
+    # workflow in `.github/workflows/workflow.yaml`.
+    GHC_VERSION: 9.0.2
 phases:
   build:
     commands: