diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 40dfd29d2..1001f782b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -206,6 +206,7 @@ source venv/bin/activate
 
 # Install external dependencies
 pip install -r requirements.txt
+pip install -r requirements-dev.txt
 # Install Superset in editable (development) mode
 pip install -e .