diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 43030b93..68bbb03a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -7,8 +7,8 @@ on:
     - master
   workflow_dispatch:
 
-# As of 7 August 2023, ubuntu-latest, windows-latest and macos-latest come
-# with Stack 2.11.1.
+# As of 27 August 2023, ubuntu-latest and windows-latest come with Stack 2.11.1
+# and macos-latest comes with Stack 2.9.3.
 
 jobs:
   build:
@@ -21,7 +21,7 @@ jobs:
         - ubuntu-latest
         resolver:
         - stack-ghc-9.2.8.yaml
-        - stack-ghc-9.4.6.yaml
+        - stack-ghc-9.4.7.yaml
         - stack-ghc-9.6.2.yaml
         include:
         - os: macos-latest
@@ -60,7 +60,7 @@ jobs:
         - ubuntu-latest
         - windows-latest
         resolver:
-        - stack-ghc-9.4.6.yaml
+        - stack-ghc-9.4.7.yaml
     steps:
     - name: Clone project
       uses: actions/checkout@v3
diff --git a/stack-ghc-9.4.6.yaml b/stack-ghc-9.4.7.yaml
similarity index 94%
rename from stack-ghc-9.4.6.yaml
rename to stack-ghc-9.4.7.yaml
index aaa9f2b2..92e39669 100644
--- a/stack-ghc-9.4.6.yaml
+++ b/stack-ghc-9.4.7.yaml
@@ -1,5 +1,6 @@
-# Snapshot specification for GHC 9.4.6.
-resolver: lts-21.8 # GHC 9.4.6
+# Snapshot specification for GHC 9.4.7.
+resolver: lts-21.9 # GHC 9.4.6
+compiler: ghc-9.4.7
 
 packages:
 - aeson-warning-parser-0.1.0@sha256:f2c1c42b73aa35d352060abcbb867c410cbbf57d0cb0fed607bcd1e2a74954ad,1308