diff --git a/src/eea.corpus/requirements.txt b/src/eea.corpus/requirements.txt
index 16425f8..12decd6 100644
--- a/src/eea.corpus/requirements.txt
+++ b/src/eea.corpus/requirements.txt
@@ -41,7 +41,7 @@ msgpack-numpy==0.4.1
 msgpack-python==0.5.4
 murmurhash==0.28.0
 networkx==2.1
-nltk==3.2.4
+nltk==3.4.5
 numexpr==2.6.2
 numpy==1.14.1
 olefile==0.44