diff --git a/infra/gcb/requirements.txt b/infra/gcb/requirements.txt
index a39ee4da0..af53d16ae 100644
--- a/infra/gcb/requirements.txt
+++ b/infra/gcb/requirements.txt
@@ -17,7 +17,7 @@ grpc-google-iam-v1==0.11.4
 grpcio==1.12.0
 httplib2==0.11.3
 idna==2.6
-Jinja2==2.10
+Jinja2==2.10.1
 MarkupSafe==1.0
 multi-key-dict==2.0.3
 oauth2client==4.1.2
@@ -28,9 +28,8 @@ pyasn1-modules==0.2.1
 python-dateutil==2.7.3
 python-jenkins==1.0.0
 pytz==2018.4
-PyYAML==3.12
-requests==2.18.4
+PyYAML==5.1
+requests==2.21.0
 rsa==3.4.2
 six==1.11.0
 uritemplate==3.0.0
-urllib3==1.22