diff --git a/requirements.txt b/requirements.txt
index 4fab44935f..653340b876 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ pathlib2==2.2.1
 sphinx==1.6.5
 recommonmark
 # nltk can be removed when we replace search with ES
-nltk==3.2.1
+nltk==3.4.5
 
 # QBANK-LITE REQ: https://github.com/CLIxIndia-Dev/qbank-lite/blob/master/requirements.txt
 # also make sure following are updated w.r.t qbank repo