diff --git a/requirements.txt b/requirements.txt
index 5d3c493..b3dfa3d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 GDAL==1.11.0
-mercurial==3.1.1
+mercurial==4.1.3
 pygame==1.9.2a0
 wsgiref==0.1.2