diff --git a/code/requirements.txt b/code/requirements.txt
index e25d6c1..34e15e8 100644
--- a/code/requirements.txt
+++ b/code/requirements.txt
@@ -85,7 +85,7 @@ navigator-updater==0.1.0
 nbconvert==5.3.1
 nbformat==4.4.0
 networkx==1.11
-nltk==3.2.4
+nltk==3.4.5
 nose==1.3.7
 notebook==5.4.1
 numba==0.35.0+10.g143f70e
diff --git a/requirements.txt b/requirements.txt
index f3a5382..0020a25 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -86,7 +86,7 @@ navigator-updater==0.1.0
 nbconvert==5.3.1
 nbformat==4.4.0
 networkx==1.11
-nltk==3.2.4
+nltk==3.4.5
 nose==1.3.7
 notebook==5.4.1
 numba==0.35.0+10.g143f70e
diff --git a/submission/requirements.txt b/submission/requirements.txt
index 1201ad7..9a3d843 100644
--- a/submission/requirements.txt
+++ b/submission/requirements.txt
@@ -86,7 +86,7 @@ navigator-updater==0.1.0
 nbconvert==5.3.1
 nbformat==4.4.0
 networkx==1.11
-nltk==3.2.4
+nltk==3.4.5
 nose==1.3.7
 notebook==5.0.0
 numba==0.35.0+10.g143f70e