diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index 197012b..80ac33f 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -106,7 +106,7 @@ jobs:
         run: |
           git clone https://github.com/mooreryan/tiny_config.git
           cd tiny_config
-          opam install base otoml
+          opam install base otoml yaml
           opam pin add tiny_config .
           opam pin add tiny_toml .
           opam install tiny_config