diff --git a/pip-sample/requirements.txt b/pip-sample/requirements.txt
index 680d08166..2685e3b7b 100644
--- a/pip-sample/requirements.txt
+++ b/pip-sample/requirements.txt
@@ -28,7 +28,7 @@ matplotlib==2.2.2
 mistune==0.8.3
 nbconvert==5.4.0
 nbformat==4.4.0
-nltk==3.3
+nltk==3.9.4
 notebook==5.7.0
 numpy==1.15.3
 oauthlib==2.1.0
@@ -48,7 +48,7 @@ python-dateutil==2.7.3
 pytz==2018.5
 pyzmq==17.1.2
 qtconsole==4.4.1
-requests==2.19.1
+requests==2.33.0
 requests-oauthlib==1.0.0
 Send2Trash==1.5.0
 simplegeneric==0.8.1