diff --git a/simple-topo/requirements.txt b/simple-topo/requirements.txt
index 5fe0253..4dc6f4c 100644
--- a/simple-topo/requirements.txt
+++ b/simple-topo/requirements.txt
@@ -9,7 +9,7 @@ ipaddress==1.0.16
 lockfile==0.12.2
 mininet==2.2.1
 ndg-httpsclient==0.4.0
-psutil==5.4.0
+psutil==5.6.6
 pyasn1==0.1.9
 pygobject==3.20.0
 pyOpenSSL==0.15.1