diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index c98e091d..78542fcd 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -1,6 +1,6 @@
 # This GitHub workflow config has been generated by a script via
 #
-#   haskell-ci '--apt' 'libx11-dev' '--apt' 'libxss-dev' '--apt' 'libxext-dev' '--apt' 'libxrandr-dev' 'github' 'xmonad-contrib.cabal'
+#   haskell-ci 'github' 'cabal.project'
 #
 # To regenerate the script (for example after adjusting tested-with) run
 #
@@ -8,9 +8,9 @@
 #
 # For more information, see https://github.com/haskell-CI/haskell-ci
 #
-# version: 0.11.20210111
+# version: 0.12
 #
-# REGENDATA ("0.11.20210111",["--apt","libx11-dev","--apt","libxss-dev","--apt","libxext-dev","--apt","libxrandr-dev","github","xmonad-contrib.cabal"])
+# REGENDATA ("0.12",["github","cabal.project"])
 #
 name: Haskell-CI
 on:
@@ -18,7 +18,7 @@ on:
   - pull_request
 jobs:
   linux:
-    name: Haskell-CI Linux - GHC ${{ matrix.ghc }}
+    name: Haskell-CI - Linux - ${{ matrix.compiler }}
     runs-on: ubuntu-18.04
     container:
       image: buildpack-deps:bionic
@@ -26,13 +26,13 @@ jobs:
     strategy:
       matrix:
         include:
-          - ghc: 8.10.3
+          - compiler: ghc-8.10.3
             allow-failure: false
-          - ghc: 8.8.4
+          - compiler: ghc-8.8.4
             allow-failure: false
-          - ghc: 8.6.5
+          - compiler: ghc-8.6.5
             allow-failure: false
-          - ghc: 8.4.4
+          - compiler: ghc-8.4.4
             allow-failure: false
       fail-fast: false
     steps:
@@ -42,28 +42,31 @@ jobs:
           apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr curl git software-properties-common
           apt-add-repository -y 'ppa:hvr/ghc'
           apt-get update
-          apt-get install -y ghc-$GHC_VERSION cabal-install-3.2 libx11-dev libxext-dev libxrandr-dev libxss-dev
+          apt-get install -y $CC cabal-install-3.4 libx11-dev libxext-dev libxft-dev libxinerama-dev libxrandr-dev libxss-dev
         env:
-          GHC_VERSION: ${{ matrix.ghc }}
+          CC: ${{ matrix.compiler }}
       - name: Set PATH and environment variables
         run: |
           echo "$HOME/.cabal/bin" >> $GITHUB_PATH
           echo "LANG=C.UTF-8" >> $GITHUB_ENV
           echo "CABAL_DIR=$HOME/.cabal" >> $GITHUB_ENV
           echo "CABAL_CONFIG=$HOME/.cabal/config" >> $GITHUB_ENV
-          HC=/opt/ghc/$GHC_VERSION/bin/ghc
+          HCDIR=$(echo "/opt/$CC" | sed 's/-/\//')
+          HCNAME=ghc
+          HC=$HCDIR/bin/$HCNAME
           echo "HC=$HC" >> $GITHUB_ENV
-          echo "HCPKG=/opt/ghc/$GHC_VERSION/bin/ghc-pkg" >> $GITHUB_ENV
-          echo "HADDOCK=/opt/ghc/$GHC_VERSION/bin/haddock" >> $GITHUB_ENV
-          echo "CABAL=/opt/cabal/3.2/bin/cabal -vnormal+nowrap" >> $GITHUB_ENV
+          echo "HCPKG=$HCDIR/bin/$HCNAME-pkg" >> $GITHUB_ENV
+          echo "HADDOCK=$HCDIR/bin/haddock" >> $GITHUB_ENV
+          echo "CABAL=/opt/cabal/3.4/bin/cabal -vnormal+nowrap" >> $GITHUB_ENV
           HCNUMVER=$(${HC} --numeric-version|perl -ne '/^(\d+)\.(\d+)\.(\d+)(\.(\d+))?$/; print(10000 * $1 + 100 * $2 + ($3 == 0 ? $5 != 1 : $3))')
           echo "HCNUMVER=$HCNUMVER" >> $GITHUB_ENV
           echo "ARG_TESTS=--enable-tests" >> $GITHUB_ENV
           echo "ARG_BENCH=--enable-benchmarks" >> $GITHUB_ENV
-          echo "ARG_COMPILER=--ghc --with-compiler=/opt/ghc/$GHC_VERSION/bin/ghc" >> $GITHUB_ENV
+          echo "HEADHACKAGE=false" >> $GITHUB_ENV
+          echo "ARG_COMPILER=--$HCNAME --with-compiler=$HC" >> $GITHUB_ENV
           echo "GHCJSARITH=0" >> $GITHUB_ENV
         env:
-          GHC_VERSION: ${{ matrix.ghc }}
+          CC: ${{ matrix.compiler }}
       - name: env
         run: |
           env
@@ -108,10 +111,14 @@ jobs:
         uses: actions/checkout@v2
         with:
           path: source
+      - name: initial cabal.project for sdist
+        run: |
+          touch cabal.project
+          echo "packages: $GITHUB_WORKSPACE/source/." >> cabal.project
+          cat cabal.project
       - name: sdist
         run: |
           mkdir -p sdist
-          cd source || false
           $CABAL sdist all --output-dir $GITHUB_WORKSPACE/sdist
       - name: unpack
         run: |
@@ -138,9 +145,9 @@ jobs:
       - name: cache
         uses: actions/cache@v2
         with:
-          key: ${{ runner.os }}-${{ matrix.ghc }}-${{ github.sha }}
+          key: ${{ runner.os }}-${{ matrix.compiler }}-${{ github.sha }}
           path: ~/.cabal/store
-          restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-
+          restore-keys: ${{ runner.os }}-${{ matrix.compiler }}-
       - name: install dependencies
         run: |
           $CABAL v2-build $ARG_COMPILER --disable-tests --disable-benchmarks --dependencies-only -j2 all
diff --git a/cabal.haskell-ci b/cabal.haskell-ci
new file mode 100644
index 00000000..e3cb39fc
--- /dev/null
+++ b/cabal.haskell-ci
@@ -0,0 +1,7 @@
+apt:
+  libx11-dev
+  libxext-dev
+  libxft-dev
+  libxinerama-dev
+  libxrandr-dev
+  libxss-dev