diff --git a/tools/requirements.txt b/tools/requirements.txt
index d6d116394..22effedc5 100644
--- a/tools/requirements.txt
+++ b/tools/requirements.txt
@@ -2,4 +2,4 @@ python-dateutil==2.8.1
 six==1.15.0
 pytest==5.4
 pytest-cov==2.9.0
-nltk==3.4.5
\ No newline at end of file
+nltk==3.9
\ No newline at end of file