diff --git a/.gitea/workflows/cmake_build.yml b/.gitea/workflows/cmake_build.yml
index e944062..f107a84 100644
--- a/.gitea/workflows/cmake_build.yml
+++ b/.gitea/workflows/cmake_build.yml
@@ -40,6 +40,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
           miniforge-version: latest
           channels: conda-forge
+          conda-remove-defaults: "true"
 
       - name: Prepare
         run: conda install doxygen sphinx=7.1.2 breathe pybind11 sphinx_rtd_theme furo nlohmann_json zeromq fmt numpy