diff --git a/.drone.yml b/.drone.yml
index cf2c8d8..32ed9bc 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -14,7 +14,7 @@ steps:
   - cargo test --verbose --all
 
 - name: test suite
-  image: rust:1.49.0-slim
+  image: rust:1.49.0-slim-bullseye
   commands:
   - apt-get -qq update && apt-get -yqq install pkg-config libssl-dev build-essential libsqlite3-dev python3.9 python3.9-venv
   - cargo install --path yama