diff --git a/requirements.txt b/requirements.txt
index 82eac64..f29afd9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 # Core AMR processing
 amrlib==0.8.0
 penman==1.3.1
-nltk==3.9.1
+nltk==3.9.4
 spacy==3.8.2
 unidecode==1.3.8
 word2number==1.1