diff --git a/.drone.yml b/.drone.yml
index a8377da..81744a5 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -77,7 +77,7 @@ steps:
     environment:
       PYTHONPATH: .
     commands:
-      - pip install python-dateutil
+      - pip install python-dateutil flask
       - python setup.py test
 
 ---
@@ -91,7 +91,7 @@ steps:
     environment:
       PYTHONPATH: .
     commands:
-      - pip install python-dateutil
+      - pip install python-dateutil flask
       - python setup.py test
 
 ---