--- a/testing/vcttesting/environment.py
+++ b/testing/vcttesting/environment.py
@@ -96,17 +96,17 @@ def install_editable(venv, relpath):
 
 def install_mercurials(venv, hg):
     """Install supported Mercurial versions in a central location."""
     VERSIONS = [
         '3.8.4',
         '3.9.2',
         '4.0.2',
         '4.1.2',
-        '4.2',
+        '4.2.2',
         '@',
     ]
 
     hg_dir = os.path.join(ROOT, 'venv', 'hg')
     mercurials = os.path.join(venv['path'], 'mercurials')
 
     # Setting HGRCPATH to an empty value stops the global and user hgrc from
     # being loaded. These could interfere with behavior we expect from