diff --git a/README.md b/README.md
index c62fe83..8c6761c 100644
--- a/README.md
+++ b/README.md
@@ -875,6 +875,7 @@ git clone https://github.com/fabiocaccamo/python-benedict.git src && cd src
 # install requirements
 pip install --upgrade pip
 pip install -r requirements.txt
+pip install -r requirements-test.txt
 
 # run tests using tox
 tox