diff --git a/requirements.txt b/requirements.txt
index e2d1e1f..338b71c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ Flask==1.1.2
 selenium==3.141.0
 PyYAML~=6.0
 pony==0.7.16
+snowballstemmer==2.2.0