diff --git a/requirements.txt b/requirements.txt
index c840b4c1819..9c491b0b6e2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ hydra-core~=1.1.0
 ipython==7.19.0
 torch>=1.4.0
 joblib==0.14.1
-nltk==3.6.4
+nltk==3.6.6
 omegaconf~=2.1.1
 pandas==1.1.1
 pytest_regressions==2.1.1