diff --git a/langs/unison.yaml b/langs/unison.yaml
index bc0f008..342ded6 100644
--- a/langs/unison.yaml
+++ b/langs/unison.yaml
@@ -21,6 +21,10 @@ install:
     "${pkg}/usr/local/bin/unison" -codebase . init
     LESS="+q" "${pkg}/usr/local/bin/unison" -codebase . <<< 'pull https://github.com/unisonweb/base:.trunk .base'
     popd
+  # Doing the pull operation seems to hang forever in CI, and then
+  # eventually the job gets killed. I think it might be using too much
+  # memory.
+  disallowCI: true
 
 setup: |
   shopt -s dotglob