diff --git a/requirements.txt b/requirements.txt
index ceb2027..b4e22a6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,6 +23,7 @@ lazy-object-proxy==1.4.3
 mccabe==0.6.1
 meson==0.53.2
 msgpack==0.6.2
+numpy==1.18.5
 oauthlib==3.1.0
 ordered-set==3.1.1
 packaging==20.1
@@ -59,3 +60,4 @@ webencodings==0.5.1
 Werkzeug==1.0.1
 wpgtk==6.1.3
 wrapt==1.12.1
+yapf==0.30.0