diff --git a/requirements.txt b/requirements.txt
index 1aed01d..fbeba22 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ twython==3.4.0
 
 scikit-learn==0.17.1
 
-nltk==3.2.1
+nltk==3.4.5
 
 pandas==0.18.1
 # gensim requires
diff --git a/requirements/old-gensim-requirements.txt b/requirements/old-gensim-requirements.txt
index a5f2aca..107e67f 100644
--- a/requirements/old-gensim-requirements.txt
+++ b/requirements/old-gensim-requirements.txt
@@ -21,7 +21,7 @@ pug-nlp==0.1.0
 # core requirements
 twython==3.4.0
 editdistance==0.3.1
-nltk==3.2.1
+nltk==3.4.5
 pandas==0.18.0
 pandas-profiling==1.0.0a2