diff --git a/requirements.txt b/requirements.txt
index 0fb73bea40..770917125c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -28,12 +28,12 @@ python-consul==0.4.7
 # utils/service_discovery/config_stores.py
 python-etcd==0.4.5
 # the libyaml bindings are optional
-pyyaml==3.11
+pyyaml==5.4
 # note: requests is also used in many checks
 # upgrade with caution
-requests==2.11.1
+requests==2.20
 # note: simplejson is used in many checks to inteface APIs
 simplejson==3.6.5
 supervisor==3.3.0
-tornado==3.2.2
+tornado==5.1
 uptime==3.0.1