diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8f802201..4cc9bf16 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -55,6 +55,7 @@ jobs:
               conda config --set always_yes yes --set auto_update_conda false --set channel_priority disabled
               conda update conda
               conda install mamba -n base -c conda-forge
+              conda install -n base conda-libmamba-solver
               mamba install python=3.10 "conda-build=3.21.9" colorama pip ruamel ruamel.yaml rich mamba jsonschema -c conda-forge
               pip install -e .
 
@@ -66,7 +67,7 @@ jobs:
             id: mambabuild
             run: |
               mamba install anaconda-client
-              conda config --set anaconda_upload no --set channel_priority disabled
+              conda config --set anaconda_upload no --set channel_priority disabled --set solver libmamba
               echo yes | anaconda login --username ${{ secrets.ANACONDA_CLOUD_USERNAME }} --password ${{ secrets.ANACONDA_CLOUD_PASSWORD }}
               git fetch --prune --unshallow --tags
               VERSION_FROM_GIT_TAG=$(git tag --list "v*[0-9]" --sort=version:refname | tail -1 | cut -c 2-) conda build . -c mosek -c anaconda -c pvlib -c slacgismo -c conda-forge --numpy 1.22.0
diff --git a/.github/workflows/test-build.yml b/.github/workflows/test-build.yml
index 497540b6..d3f1d97a 100644
--- a/.github/workflows/test-build.yml
+++ b/.github/workflows/test-build.yml
@@ -52,6 +52,7 @@ jobs:
               conda config --set always_yes yes --set auto_update_conda false --set channel_priority disabled
               conda update conda
               conda install mamba -n base -c conda-forge
+              conda install -n base conda-libmamba-solver
               mamba install python=3.10 "conda-build=3.21.9" colorama pip ruamel ruamel.yaml rich mamba jsonschema -c conda-forge
               pip install -e .
 
@@ -63,7 +64,7 @@ jobs:
             id: mambabuild
             run: |
               mamba install anaconda-client
-              conda config --set anaconda_upload no --set channel_priority disabled
+              conda config --set anaconda_upload no --set channel_priority disabled --set solver libmamba
               git fetch --prune --unshallow --tags
               VERSION_FROM_GIT_TAG=$(git tag --list "v*[0-9]" --sort=version:refname | tail -1 | cut -c 2-)test conda build . -c mosek -c anaconda -c pvlib -c slacgismo -c conda-forge --numpy 1.22.0
               echo '::set-output name=gitversion::$(git tag --list "v*[0-9]" --sort=version:refname | tail -1 | cut -c 2-)'