diff --git a/hgsubversion/__init__.py b/hgsubversion/__init__.py
--- a/hgsubversion/__init__.py
+++ b/hgsubversion/__init__.py
@@ -15,7 +15,7 @@
 For more information and instructions, see :hg:`help subversion`.
 '''
 
-testedwith = '3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6'
+testedwith = '3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7'
 
 import os
 
diff --git a/tox.ini b/tox.ini
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = hg37,hg38,hg39,hg40,hg41,hg42,hg43,hg44,hg45,hg46
+envlist = hg37,hg38,hg39,hg40,hg41,hg42,hg43,hg44,hg45,hg46,hg47
 
 [testenv]
 deps=
@@ -14,5 +14,6 @@
     hg44: Mercurial==4.4.2
     hg45: Mercurial==4.5.2
     hg46: Mercurial==4.6
+    hg47: Mercurial==4.7
     subvertpy
 commands=nosetests {posargs}