diff --git a/requirements.txt b/requirements.txt
index 1ec17a7..54b915f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ Pygments==2.2.0
 pytz==2017.3
 requests==2.18.4
 six==1.11.0
-snowballstemmer==1.2.1
+snowballstemmer==2.1.0
 Sphinx==1.6.6
 sphinx-rtd-theme==0.2.4
 sphinxcontrib-websupport==1.0.1