diff --git a/mbed-os/requirements.txt b/mbed-os/requirements.txt
index c5899241..f4f0aa16 100644
--- a/mbed-os/requirements.txt
+++ b/mbed-os/requirements.txt
@@ -2,7 +2,7 @@ colorama==0.3.9
 urllib3[secure]==1.24.2
 prettytable==0.7.2
 junit-xml==1.8
-pyyaml==4.2b1
+pyyaml==5.4
 jsonschema==2.6.0
 future==0.16.0
 six==1.12.0