diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index ddeacbab..0f509b9d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -45,6 +45,6 @@ jobs:
       - run: opam exec -- dune build @src/runtest @examples/runtest @tests/runtest -p tiny_httpd_camlzip
         if: ${{ matrix.os == 'ubuntu-latest' }}
 
-      - run: opam install logs -y
+      - run: opam install logs magic-mime -y
 
       - run: opam exec -- dune build @install -p tiny_httpd,tiny_httpd_camlzip