diff --git a/requirements.txt b/requirements.txt
index e160475..a1e35a4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,8 +16,8 @@ numpy==1.13.3
 protobuf==3.5.1
 python-dateutil==2.6.0
 pytz==2017.2
-PyYAML==3.12
-requests==2.18.4
+PyYAML==4.2b1
+requests==2.21.0
 scikit-learn==0.19.1
 scipy==1.0.0
 seqeval==0.0.3
@@ -26,6 +26,6 @@ smart-open==1.5.3
 tensorboard==1.8.0
 tensorflow==1.8.0
 Theano==0.9.0
-urllib3==1.22
+urllib3==1.24.1
 Werkzeug==0.12.2
 allennlp==0.7.1