diff --git a/requirements.txt b/requirements.txt
index 39dd1fc8e4..e7f6071e59 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,4 +19,5 @@ future==0.16.0
 six==1.11.0
 git+https://github.com/armmbed/manifest-tool.git@v1.4.6
 mbed-cloud-sdk==2.0.1
+pyocd>=0.14,<0.15
 icetea>=1.0.2,<1.1