diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index 3b80a33f..4fc4ab49 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -6,11 +6,11 @@
 #
 #   haskell-ci regenerate
 #
-# For more information, see https://github.com/haskell-CI/haskell-ci
+# For more information, see https://github.com/andreasabel/haskell-ci
 #
-# version: 0.17.20230817
+# version: 0.17.20230911
 #
-# REGENDATA ("0.17.20230817",["github","cabal.project"])
+# REGENDATA ("0.17.20230911",["github","cabal.project"])
 #
 name: Haskell-CI
 on:
@@ -29,19 +29,24 @@ jobs:
     timeout-minutes:
       60
     container:
-      image: buildpack-deps:bionic
+      image: buildpack-deps:focal
     continue-on-error: ${{ matrix.allow-failure }}
     strategy:
       matrix:
         include:
+          - compiler: ghc-9.8.0.20230822
+            compilerKind: ghc
+            compilerVersion: 9.8.0.20230822
+            setup-method: ghcup
+            allow-failure: true
           - compiler: ghc-9.6.2
             compilerKind: ghc
             compilerVersion: 9.6.2
             setup-method: ghcup
             allow-failure: false
-          - compiler: ghc-9.4.6
+          - compiler: ghc-9.4.7
             compilerKind: ghc
-            compilerVersion: 9.4.6
+            compilerVersion: 9.4.7
             setup-method: ghcup
             allow-failure: false
           - compiler: ghc-9.2.8
@@ -99,6 +104,7 @@ jobs:
             mkdir -p "$HOME/.ghcup/bin"
             curl -sL https://downloads.haskell.org/ghcup/0.1.19.5/x86_64-linux-ghcup-0.1.19.5 > "$HOME/.ghcup/bin/ghcup"
             chmod a+x "$HOME/.ghcup/bin/ghcup"
+            "$HOME/.ghcup/bin/ghcup" config add-release-channel https://raw.githubusercontent.com/haskell/ghcup-metadata/master/ghcup-prereleases-0.0.7.yaml;
             "$HOME/.ghcup/bin/ghcup" install ghc "$HCVER" || (cat "$HOME"/.ghcup/logs/*.* && false)
             "$HOME/.ghcup/bin/ghcup" install cabal 3.10.1.0 || (cat "$HOME"/.ghcup/logs/*.* && false)
           else
@@ -108,6 +114,7 @@ jobs:
             mkdir -p "$HOME/.ghcup/bin"
             curl -sL https://downloads.haskell.org/ghcup/0.1.19.5/x86_64-linux-ghcup-0.1.19.5 > "$HOME/.ghcup/bin/ghcup"
             chmod a+x "$HOME/.ghcup/bin/ghcup"
+            "$HOME/.ghcup/bin/ghcup" config add-release-channel https://raw.githubusercontent.com/haskell/ghcup-metadata/master/ghcup-prereleases-0.0.7.yaml;
             "$HOME/.ghcup/bin/ghcup" install cabal 3.10.1.0 || (cat "$HOME"/.ghcup/logs/*.* && false)
           fi
         env:
@@ -141,7 +148,7 @@ jobs:
           echo "HCNUMVER=$HCNUMVER" >> "$GITHUB_ENV"
           echo "ARG_TESTS=--enable-tests" >> "$GITHUB_ENV"
           echo "ARG_BENCH=--enable-benchmarks" >> "$GITHUB_ENV"
-          echo "HEADHACKAGE=false" >> "$GITHUB_ENV"
+          if [ $((HCNUMVER >= 90800)) -ne 0 ] ; then echo "HEADHACKAGE=true" >> "$GITHUB_ENV" ; else echo "HEADHACKAGE=false" >> "$GITHUB_ENV" ; fi
           echo "ARG_COMPILER=--$HCKIND --with-compiler=$HC" >> "$GITHUB_ENV"
           echo "GHCJSARITH=0" >> "$GITHUB_ENV"
         env:
@@ -170,6 +177,18 @@ jobs:
           repository hackage.haskell.org
             url: http://hackage.haskell.org/
           EOF
+          if $HEADHACKAGE; then
+          cat >> $CABAL_CONFIG <<EOF
+          repository head.hackage.ghc.haskell.org
+             url: https://ghc.gitlab.haskell.org/head.hackage/
+             secure: True
+             root-keys: 7541f32a4ccca4f97aea3b22f5e593ba2c0267546016b992dfadcd2fe944e55d
+                        26021a13b401500c8eb2761ca95c61f2d625bfef951b939a8124ed12ecf07329
+                        f76d08be13e9a61a377a85e2fb63f4c5435d40f8feb3e12eb05905edb8cdea89
+             key-threshold: 3
+          active-repositories: hackage.haskell.org, head.hackage.ghc.haskell.org:override
+          EOF
+          fi
           cat $CABAL_CONFIG
       - name: versions
         run: |
@@ -189,7 +208,7 @@ jobs:
           chmod a+x $HOME/.cabal/bin/cabal-plan
           cabal-plan --version
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: source
       - name: initial cabal.project for sdist
@@ -223,6 +242,9 @@ jobs:
           if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods" >> cabal.project ; fi
           cat >> cabal.project <<EOF
           EOF
+          if $HEADHACKAGE; then
+          echo "allow-newer: $($HCPKG list --simple-output | sed -E 's/([a-zA-Z-]+)-[0-9.]+/*:\1,/g')" >> cabal.project
+          fi
           $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: $_ installed\n" unless /^(BNFC|bnfc-system-tests)$/; }' >> cabal.project.local
           cat cabal.project
           cat cabal.project.local
diff --git a/source/BNFC.cabal b/source/BNFC.cabal
index 4ea83262..582a5dd1 100644
--- a/source/BNFC.cabal
+++ b/source/BNFC.cabal
@@ -32,8 +32,9 @@ Description:
 
 -- Support range when build with cabal
 tested-with:
+  GHC == 9.8.0
   GHC == 9.6.2
-  GHC == 9.4.6
+  GHC == 9.4.7
   GHC == 9.2.8
   GHC == 9.0.2
   GHC == 8.10.7
diff --git a/testing/bnfc-system-tests.cabal b/testing/bnfc-system-tests.cabal
index 08c54768..ee219369 100644
--- a/testing/bnfc-system-tests.cabal
+++ b/testing/bnfc-system-tests.cabal
@@ -50,8 +50,9 @@ build-type:          Simple
 cabal-version:       >=1.10
 
 tested-with:
+    GHC == 9.8.0
     GHC == 9.6.2
-    GHC == 9.4.6
+    GHC == 9.4.7
     GHC == 9.2.8
     GHC == 9.0.2
     GHC == 8.10.7