diff --git a/.drone.yml b/.drone.yml
index 8d9800e..8d95fd4 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -27,7 +27,7 @@ steps:
     settings:
       archive_format: gzip
       bucket: trainlog-cache
-      cache_key: '{{ .Repo.Name }}-{{ checksum "mix.lock" }}'
+      cache_key: '{{ .Repo.Name }}-{{ checksum ".tool-versions" }}-{{ checksum "mix.lock" }}'
       endpoint: minio:9000
       mount:
         - _build
@@ -67,7 +67,7 @@ steps:
     settings:
       archive_format: gzip
       bucket: trainlog-cache
-      cache_key: '{{ .Repo.Name }}-{{ checksum "mix.lock" }}'
+      cache_key: '{{ .Repo.Name }}-{{ checksum ".tool-versions" }}-{{ checksum "mix.lock" }}'
       endpoint: minio:9000
       exit_code: true
       mount: