diff --git a/requirements.txt b/requirements.txt
index fd7b0e56..7dc80b4c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ deltas >= 0.7.0, < 0.7.999
 docopt >= 0.6.2, < 0.6.999
 gensim >= 3.8.1
 hanziconv >= 0.3.2, < 0.3.999
-mmh3 >= 2.5.1, < 2.5.999
+mmh3 >= 2.5.1, < 3.1.1
 more-itertools >= 7.2.0, < 7.2.999
 mwapi >= 0.5.0, < 0.6.999
 mwbase >= 0.1.4, < 0.1.999