diff --git a/.github/workflows/main.yml b/.github/workflows/ci.yml
similarity index 96%
rename from .github/workflows/main.yml
rename to .github/workflows/ci.yml
index 819e0d4..027b999 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/ci.yml
@@ -1,3 +1,5 @@
+name: CI
+
 on:
   push:
 
@@ -6,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        hg: [ '5.5', '5.6', '5.7', '5.8', '5.9', '6.0', '6.1', '6.2', '6.3' ]
+        hg: [ '5.5', '5.6', '5.7', '5.8', '5.9', '6.0', '6.1', '6.2', '6.3', '6.4' ]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
diff --git a/tools/versions.txt b/tools/versions.txt
index 3981c12..b36231e 100644
--- a/tools/versions.txt
+++ b/tools/versions.txt
@@ -38,3 +38,4 @@
 6.1
 6.2
 6.3
+6.4