diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index 2c319584..51b85bf2 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -8,14 +8,21 @@
 #
 # For more information, see https://github.com/haskell-CI/haskell-ci
 #
-# version: 0.19.20250506
+# version: 0.19.20260104
 #
-# REGENDATA ("0.19.20250506",["github","cabal.project","--config","cabal.haskell-ci","--project"])
+# REGENDATA ("0.19.20260104",["github","cabal.project","--config","cabal.haskell-ci","--project"])
 #
 name: Haskell-CI
 on:
-  - push
-  - pull_request
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  merge_group:
+    branches:
+      - master
 jobs:
   linux:
     name: Haskell-CI - Linux - ${{ matrix.compiler }}
@@ -28,14 +35,19 @@ jobs:
     strategy:
       matrix:
         include:
+          - compiler: ghc-9.14.1
+            compilerKind: ghc
+            compilerVersion: 9.14.1
+            setup-method: ghcup
+            allow-failure: false
           - compiler: ghc-9.12.2
             compilerKind: ghc
             compilerVersion: 9.12.2
             setup-method: ghcup
             allow-failure: false
-          - compiler: ghc-9.10.2
+          - compiler: ghc-9.10.3
             compilerKind: ghc
-            compilerVersion: 9.10.2
+            compilerVersion: 9.10.3
             setup-method: ghcup
             allow-failure: false
           - compiler: ghc-9.8.4
@@ -106,8 +118,8 @@ jobs:
           chmod a+x "$HOME/.ghcup/bin/ghcup"
       - name: Install cabal-install
         run: |
-          "$HOME/.ghcup/bin/ghcup" install cabal 3.14.2.0 || (cat "$HOME"/.ghcup/logs/*.* && false)
-          echo "CABAL=$HOME/.ghcup/bin/cabal-3.14.2.0 -vnormal+nowrap" >> "$GITHUB_ENV"
+          "$HOME/.ghcup/bin/ghcup" install cabal 3.16.0.0 || (cat "$HOME"/.ghcup/logs/*.* && false)
+          echo "CABAL=$HOME/.ghcup/bin/cabal-3.16.0.0 -vnormal+nowrap" >> "$GITHUB_ENV"
       - name: Install GHC (GHCup)
         if: matrix.setup-method == 'ghcup'
         run: |
@@ -183,7 +195,7 @@ jobs:
           chmod a+x $HOME/.cabal/bin/cabal-plan
           cabal-plan --version
       - name: checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           path: source
       - name: initial cabal.project for sdist
@@ -212,12 +224,12 @@ jobs:
           echo "packages: ${PKGDIR_happy_lib}" >> cabal.project
           echo "packages: ${PKGDIR_happy}" >> cabal.project
           if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "package happy-lib" >> cabal.project ; fi
-          if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods" >> cabal.project ; fi
+          if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods -Werror=missing-fields" >> cabal.project ; fi
           if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "package happy" >> cabal.project ; fi
-          if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods" >> cabal.project ; fi
+          if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods -Werror=missing-fields" >> cabal.project ; fi
           cat >> cabal.project <<EOF
           EOF
-          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: any.$_ installed\n" unless /^(containers|happy|happy-lib|mtl|transformers)$/; }' >> cabal.project.local
+          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: any.$_ installed\n" unless /^(happy|happy-lib|mtl|transformers)$/; }' >> cabal.project.local
           cat cabal.project
           cat cabal.project.local
       - name: dump install plan
diff --git a/cabal.haskell-ci b/cabal.haskell-ci
index 2e908b47..40d844cb 100644
--- a/cabal.haskell-ci
+++ b/cabal.haskell-ci
@@ -1,2 +1,11 @@
+branches: master
+error-incomplete-patterns: False
+error-unused-packages: False
+
 -- Specify 'constraint: ... installed' packages
-installed: +all -containers -mtl -transformers
+installed: +all -transformers -mtl
+-- * mtl is for GHC 8.4:
+-- > rejecting: happy-lib-2.1.7 (conflict: mtl => transformers==0.5.5.0/installed-0.5.5.0, happy-lib => transformers>=0.5.6.2)
+-- * transformers is for GHCs 8.0 and 8.2:
+-- > rejecting: transformers-0.5.2.0/installed-0.5.2.0 (conflict: mtl => transformers>=0.5.6 && <0.7)
+
diff --git a/happy.cabal b/happy.cabal
index fe2a5a84..ae9cef27 100644
--- a/happy.cabal
+++ b/happy.cabal
@@ -19,8 +19,9 @@ Description:
   grammar.  Happy works in a similar way to the @yacc@ tool for C.
 
 tested-with:
+        GHC == 9.14.1
         GHC == 9.12.2
-        GHC == 9.10.2
+        GHC == 9.10.3
         GHC == 9.8.4
         GHC == 9.6.7
         GHC == 9.4.8
diff --git a/lib/happy-lib.cabal b/lib/happy-lib.cabal
index 5bc94da1..42e34f84 100644
--- a/lib/happy-lib.cabal
+++ b/lib/happy-lib.cabal
@@ -34,8 +34,9 @@ Description:
       multiple parse trees (Happy.Backend.GLR.*)
 
 tested-with:
+        GHC == 9.14.1
         GHC == 9.12.2
-        GHC == 9.10.2
+        GHC == 9.10.3
         GHC == 9.8.4
         GHC == 9.6.7
         GHC == 9.4.8