diff --git a/.drone.yml b/.drone.yml
index 512baa5..f7617bc 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -15,7 +15,7 @@ steps:
       - python livres_fr.py
       - python livres_en.py
   - name: pdf
-    image: debian
+    image: debian:10-slim
     commands:
       - apt-get update
       - apt-get install -y --no-install-recommends calibre