diff --git a/.github/workflows/caching.yml b/.github/workflows/caching.yml
index 424c558a22..2ebe808210 100644
--- a/.github/workflows/caching.yml
+++ b/.github/workflows/caching.yml
@@ -67,7 +67,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ["9.0.1", '8.10.7', '8.10.6', "8.8.4", "8.6.5"]
+        ghc: ["9.2.1", "9.0.1", '8.10.7', '8.10.6', "8.8.4", "8.6.5"]
         os: [ubuntu-latest, macOS-latest, windows-latest]
         cabal: ['3.6']
 
@@ -99,6 +99,14 @@ jobs:
           # `&&` insures `rm -f` return is positive.
           # Many platforms also have `alias cp='cp -i'`.
           rm -f -v cabal.project && cp -v cabal-ghc901.project cabal.project
+      - if: matrix.ghc == '9.2.1'
+        name: (GHC 9.2.1) Use modified `cabal.project`
+        run: |
+          # File has some protections preventing regular `rm`.
+          # (most probably sticky bit is set on $HOME)
+          # `&&` insures `rm -f` return is positive.
+          # Many platforms also have `alias cp='cp -i'`.
+          rm -f -v cabal.project && cp -v cabal-ghc921.project cabal.project
       - if: runner.os == 'Windows' && matrix.ghc == '8.8.4'
         name: (Windows,GHC 8.8) Modify `cabal.project` to workaround segfaults
         run: |
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d530dfc3b0..bb80b2444e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -40,7 +40,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        ghc: ["9.0.1", '8.10.7', '8.10.6', "8.8.4", "8.6.5"]
+        ghc: ["9.2.1", "9.0.1", '8.10.7', '8.10.6', "8.8.4", "8.6.5"]
         os: [ubuntu-latest, macOS-latest]
         cabal: ['3.6']
         include:
diff --git a/cabal-ghc921.project b/cabal-ghc921.project
index fa7ced63d0..585fc85930 100644
--- a/cabal-ghc921.project
+++ b/cabal-ghc921.project
@@ -36,7 +36,7 @@ package *
 
 write-ghc-environment-files: never
 
-index-state: 2021-11-29T12:30:10Z
+index-state: 2021-12-18T00:00:07Z
 
 constraints:
   -- These plugins doesn't work on GHC92 yet