diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index 3ac2823..1ad7896 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -28,6 +28,11 @@ jobs:
     strategy:
       matrix:
         include:
+          - compiler: ghc-9.12.0.20241128
+            compilerKind: ghc
+            compilerVersion: 9.12.0.20241128
+            setup-method: ghcup-prerelease
+            allow-failure: false
           - compiler: ghc-9.10.1
             compilerKind: ghc
             compilerVersion: 9.10.1
@@ -117,6 +122,21 @@ jobs:
           HCKIND: ${{ matrix.compilerKind }}
           HCNAME: ${{ matrix.compiler }}
           HCVER: ${{ matrix.compilerVersion }}
+      - name: Install GHC (GHCup prerelease)
+        if: matrix.setup-method == 'ghcup-prerelease'
+        run: |
+          "$HOME/.ghcup/bin/ghcup" config add-release-channel https://raw.githubusercontent.com/haskell/ghcup-metadata/master/ghcup-prereleases-0.0.8.yaml;
+          "$HOME/.ghcup/bin/ghcup" install ghc "$HCVER" || (cat "$HOME"/.ghcup/logs/*.* && false)
+          HC=$("$HOME/.ghcup/bin/ghcup" whereis ghc "$HCVER")
+          HCPKG=$(echo "$HC" | sed 's#ghc$#ghc-pkg#')
+          HADDOCK=$(echo "$HC" | sed 's#ghc$#haddock#')
+          echo "HC=$HC" >> "$GITHUB_ENV"
+          echo "HCPKG=$HCPKG" >> "$GITHUB_ENV"
+          echo "HADDOCK=$HADDOCK" >> "$GITHUB_ENV"
+        env:
+          HCKIND: ${{ matrix.compilerKind }}
+          HCNAME: ${{ matrix.compiler }}
+          HCVER: ${{ matrix.compilerVersion }}
       - name: Set PATH and environment variables
         run: |
           echo "$HOME/.cabal/bin" >> $GITHUB_PATH
@@ -127,7 +147,7 @@ jobs:
           echo "HCNUMVER=$HCNUMVER" >> "$GITHUB_ENV"
           echo "ARG_TESTS=--enable-tests" >> "$GITHUB_ENV"
           echo "ARG_BENCH=--enable-benchmarks" >> "$GITHUB_ENV"
-          echo "HEADHACKAGE=false" >> "$GITHUB_ENV"
+          if [ $((HCNUMVER >= 91200)) -ne 0 ] ; then echo "HEADHACKAGE=true" >> "$GITHUB_ENV" ; else echo "HEADHACKAGE=false" >> "$GITHUB_ENV" ; fi
           echo "ARG_COMPILER=--$HCKIND --with-compiler=$HC" >> "$GITHUB_ENV"
         env:
           HCKIND: ${{ matrix.compilerKind }}
@@ -155,6 +175,18 @@ 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 <<EOF
           program-default-options
             ghc-options: $GHCJOBS +RTS -M3G -RTS
@@ -208,6 +240,9 @@ jobs:
           package th-compat
             ghc-options: -Werror
           EOF
+          if $HEADHACKAGE; then
+          echo "allow-newer: $($HCPKG list --simple-output | sed -E 's/([a-zA-Z-]+)-[0-9.]+/*:\1,/g')" >> cabal.project
+          fi
           $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: any.$_ installed\n" unless /^(th-compat)$/; }' >> cabal.project.local
           cat cabal.project
           cat cabal.project.local
diff --git a/th-compat.cabal b/th-compat.cabal
index 31a42a6..be30b73 100644
--- a/th-compat.cabal
+++ b/th-compat.cabal
@@ -32,6 +32,7 @@ tested-with:         GHC == 8.0.2
                    , GHC == 9.6.6
                    , GHC == 9.8.4
                    , GHC == 9.10.1
+                   , GHC == 9.12.1
 extra-source-files:  CHANGELOG.md, README.md
 
 source-repository head
@@ -41,7 +42,7 @@ source-repository head
 library
   exposed-modules:     Language.Haskell.TH.Syntax.Compat
   build-depends:       base             >= 4.9  && < 5
-                     , template-haskell >= 2.11 && < 2.23
+                     , template-haskell >= 2.11 && < 2.24
   if !impl(ghc >= 9.4)
     build-depends:     filepath         >= 1.2.0.0 && < 1.6
                      , directory        >= 1.1.0.0 && < 1.4
@@ -59,7 +60,7 @@ test-suite spec
   build-depends:       base             >= 4.9 && < 5
                      , hspec            >= 2   && < 3
                      , mtl              >= 2.1 && < 2.4
-                     , template-haskell >= 2.5 && < 2.23
+                     , template-haskell >= 2.5 && < 2.24
                      , th-compat
   build-tool-depends:  hspec-discover:hspec-discover >= 2
   hs-source-dirs:      tests