diff --git a/.github/workflows/build-book.yaml b/.github/workflows/build-book.yaml
index 216b4df..7a554ee 100644
--- a/.github/workflows/build-book.yaml
+++ b/.github/workflows/build-book.yaml
@@ -179,7 +179,6 @@ jobs:
           && steps.parse_config.outputs.execute_notebooks != 'binder'
         run: |
           mamba env update -n ${{ inputs.environment_name }} -f ${{ inputs.environment_file }}
-          mamba install -c conda-forge sphinxcontrib-applehelp=1.0.4 sphinxcontrib-devhelp=1.0.2 sphinxcontrib-htmlhelp=2.0.1 sphinxcontrib-qthelp=1.0.3 sphinxcontrib-serializinghtml=1.1.5
 
       - name: Get paths to notebook files
         if: |