diff --git a/.drone.yml b/.drone.yml
index 141c0e8..bf19a3f 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -17,7 +17,7 @@ steps:
   - name: install dependencies
     image: node:16-alpine
     commands:
-      - npm install
+      - npm install --save-dev jest ts-jest @types/jest
 
   - name: run tests
     image: node:16-alpine