diff --git a/contrib/import-checker.py b/contrib/import-checker.py
--- a/contrib/import-checker.py
+++ b/contrib/import-checker.py
@@ -40,8 +40,6 @@
     # third-party imports should be directly imported
     'mercurial.thirdparty',
     'mercurial.thirdparty.attr',
-    'mercurial.thirdparty.cbor',
-    'mercurial.thirdparty.cbor.cbor2',
     'mercurial.thirdparty.zope',
     'mercurial.thirdparty.zope.interface',
 )
diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -846,8 +846,6 @@
             'mercurial.pure',
             'mercurial.thirdparty',
             'mercurial.thirdparty.attr',
-            'mercurial.thirdparty.cbor',
-            'mercurial.thirdparty.cbor.cbor2',
             'mercurial.thirdparty.zope',
             'mercurial.thirdparty.zope.interface',
             'mercurial.utils',