diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bf02150..bb70d30 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ on:
 jobs:
   test-earliest:
     name: Run test suite on the earliest supported Python version
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - uses: actions/checkout@v4
diff --git a/hg-fast-export.py b/hg-fast-export.py
index b67110b..f00943c 100755
--- a/hg-fast-export.py
+++ b/hg-fast-export.py
@@ -539,7 +539,7 @@ def hg2git(repourl,m,marksfile,mappingfile,headsfile,tipfile,
   if len(state_cache) != 0:
     for (name, data) in [(marksfile, old_marks),
                          (mappingfile, mapping_cache),
-                         (headsfile, state_cache)]:
+                         (headsfile, heads_cache)]:
       check_cache(name, data)
 
   ui,repo=setup_repo(repourl)