diff --git a/.github/workflows/manubot.yaml b/.github/workflows/manubot.yaml
index 196030a8..ec6ba410 100644
--- a/.github/workflows/manubot.yaml
+++ b/.github/workflows/manubot.yaml
@@ -84,9 +84,6 @@ jobs:
           activate-environment: manubot
           environment-file: build/environment.yml
           auto-activate-base: false
-          miniforge-variant: Mambaforge
-          miniforge-version: 'latest'
-          use-mamba: true
       - name: Install Spellcheck
         if: env.SPELLCHECK == 'true'
         run: bash ci/install-spellcheck.sh