diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index adb1a716..8f3eaca7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,6 +32,7 @@ jobs:
           activate-environment: firecrown_developer
           python-version: ${{ matrix.python-version }}
           show-channel-urls: true
+          conda-remove-defaults: true
       - name: Cache date
         id: get-date
         run: echo "today=$(/bin/date -u '+%Y%m%d')" >> $GITHUB_OUTPUT