diff --git a/backend/requirements.txt b/backend/requirements.txt
index 650cdb3..7c048a2 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -52,4 +52,4 @@ langdetect==1.0.9
 # --- OPZIONALI (NLP avanzato) ---
 # Decommentare se serve il classificatore bayesiano:
 scikit-learn>=1.9.0
-nltk>=3.9.4
+nltk>=3.10.0
diff --git a/backend/requirements_optional.txt b/backend/requirements_optional.txt
index be9c1dc..639a63d 100644
--- a/backend/requirements_optional.txt
+++ b/backend/requirements_optional.txt
@@ -10,4 +10,4 @@
 # (funzionalita' prevista nella roadmap, non ancora attiva nel core).
 
 scikit-learn>=1.9.0
-nltk>=3.9.4
+nltk>=3.10.0