diff --git a/requirements.txt b/requirements.txt
index ccfae65..1b5e22a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ numpy<2.0
 PYYaml
 Levenshtein
 ruamel.yaml
-nltk==3.7
+nltk==3.9.2
 pynini==2.1.6
 soundfile
 transformers>=4.51.3