diff --git a/.circleci/config.yml b/.circleci/config.yml
index 4b8dd3bd..62dcfadb 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -38,6 +38,7 @@ commands:
             cd spec/dummy/
             xargs -a Aptfile sudo apt-get install
             sudo apt-get install libvips
+            sudo apt-get install file
       - run:
           name: Install bundle dependencies
           command: |