diff --git a/pyproject.toml b/pyproject.toml
index 5ca850182..8dba2d35a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -79,7 +79,7 @@ dependencies = [
     # Extension of metrics
     "aenum==3.1.15",
     # Base metrics
-    "nltk==3.9.1",
+    "nltk==3.9.3",
     "scikit-learn",
     "sacrebleu",
     "rouge_score==0.1.2",