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--- a/ForgeHg/setup.py
+++ b/ForgeHg/setup.py
@@ -20,7 +20,7 @@
       install_requires=[
           # -*- Extra requirements: -*-
           'pyforge',
-          'mercurial==1.4.1',
+          'mercurial >= 1.4.1, <= 1.4.3',
       ],
       entry_points="""
       # -*- Entry points: -*-