diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index e8270da..fdd4efb 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -8,9 +8,9 @@
 #
 # For more information, see https://github.com/haskell-CI/haskell-ci
 #
-# version: 0.19.20240608
+# version: 0.19.20241109
 #
-# REGENDATA ("0.19.20240608",["github","cabal.project"])
+# REGENDATA ("0.19.20241109",["github","cabal.project"])
 #
 name: Haskell-CI
 on:
@@ -32,6 +32,11 @@ jobs:
     strategy:
       matrix:
         include:
+          - compiler: ghc-9.12.0.20241031
+            compilerKind: ghc
+            compilerVersion: 9.12.0.20241031
+            setup-method: ghcup
+            allow-failure: false
           - compiler: ghc-9.10.1
             compilerKind: ghc
             compilerVersion: 9.10.1
@@ -54,10 +59,11 @@ jobs:
           apt-get update
           apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr curl git software-properties-common libtinfo5
           mkdir -p "$HOME/.ghcup/bin"
-          curl -sL https://downloads.haskell.org/ghcup/0.1.20.0/x86_64-linux-ghcup-0.1.20.0 > "$HOME/.ghcup/bin/ghcup"
+          curl -sL https://downloads.haskell.org/ghcup/0.1.30.0/x86_64-linux-ghcup-0.1.30.0 > "$HOME/.ghcup/bin/ghcup"
           chmod a+x "$HOME/.ghcup/bin/ghcup"
+          "$HOME/.ghcup/bin/ghcup" config add-release-channel https://raw.githubusercontent.com/haskell/ghcup-metadata/master/ghcup-prereleases-0.0.8.yaml;
           "$HOME/.ghcup/bin/ghcup" install ghc "$HCVER" || (cat "$HOME"/.ghcup/logs/*.* && false)
-          "$HOME/.ghcup/bin/ghcup" install cabal 3.10.2.0 || (cat "$HOME"/.ghcup/logs/*.* && false)
+          "$HOME/.ghcup/bin/ghcup" install cabal 3.12.1.0 || (cat "$HOME"/.ghcup/logs/*.* && false)
         env:
           HCKIND: ${{ matrix.compilerKind }}
           HCNAME: ${{ matrix.compiler }}
@@ -75,7 +81,7 @@ jobs:
           echo "HC=$HC" >> "$GITHUB_ENV"
           echo "HCPKG=$HCPKG" >> "$GITHUB_ENV"
           echo "HADDOCK=$HADDOCK" >> "$GITHUB_ENV"
-          echo "CABAL=$HOME/.ghcup/bin/cabal-3.10.2.0 -vnormal+nowrap" >> "$GITHUB_ENV"
+          echo "CABAL=$HOME/.ghcup/bin/cabal-3.12.1.0 -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"
@@ -159,6 +165,7 @@ jobs:
           echo "package hashable" >> cabal.project
           echo "    ghc-options: -Werror=missing-methods" >> cabal.project
           cat >> cabal.project <<EOF
+          allow-newer: splitmix:base
           EOF
           $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: any.$_ installed\n" unless /^(hashable)$/; }' >> cabal.project.local
           cat cabal.project
diff --git a/cabal.project b/cabal.project
index 7cbdb4e..5b5d749 100644
--- a/cabal.project
+++ b/cabal.project
@@ -1,6 +1,7 @@
 packages: .
 tests: True
 
+allow-newer: splitmix:base
 --
 -- allow-newer: base
 -- allow-newer: bytestring
diff --git a/hashable.cabal b/hashable.cabal
index 79901f9..d95f3d2 100644
--- a/hashable.cabal
+++ b/hashable.cabal
@@ -31,7 +31,7 @@ bug-reports:
 stability:          Provisional
 category:           Data
 build-type:         Simple
-tested-with:        GHC ==9.6.5 || ==9.8.2 || ==9.10.1
+tested-with:        GHC ==9.6.5 || ==9.8.2 || ==9.10.1 || ==9.12.1
 extra-source-files:
   CHANGES.md
   include/HsHashable.h
@@ -81,7 +81,7 @@ library
 
   hs-source-dirs:   src
   build-depends:
-    , base        >=4.18.0.0 && <4.21
+    , base        >=4.18.0.0 && <4.22
     , bytestring  >=0.11.5.3 && <0.13
     , containers  >=0.6.7    && <0.8
     , deepseq     >=1.4.8.1  && <1.6
@@ -182,7 +182,7 @@ test-suite xxhash-tests
 
   default-language: Haskell2010
   build-depends:
-    , base
+    , base              <5
     , bytestring
     , primitive         ^>=0.9.0.0
     , tasty             ^>=1.5