diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5cef2da4..c62a8e35 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -103,6 +103,8 @@ jobs:
            auto-update-conda: true
            channels: conda-forge
            channel-priority: strict
+           miniforge-variant: Mambaforge
+           use-mamba: true
       - name: Print Conda info
         shell: bash -l {0}
         run: |
diff --git a/.github/workflows/test.sh b/.github/workflows/test.sh
index 05a59ffe..6dbd1c0e 100755
--- a/.github/workflows/test.sh
+++ b/.github/workflows/test.sh
@@ -2,7 +2,7 @@
 
 eval "$(conda shell.bash hook)"
 
-# Create and activate conda environment for this test
+# Create and activate mamba environment for this test
 BINDING=$(echo "$1" | tr '[:lower:]' '[:upper:]')
 QT_VERSION_VAR=${BINDING}_QT_VERSION
 
@@ -12,17 +12,17 @@ if [ "${!QT_VERSION_VAR:0:3}" = "5.9" ]; then
     PYTEST_VERSION=">=6,!=7.0.0,!=7.0.1,<7.2.0"
 fi
 
-conda create -q -n test-env-${BINDING} python=${PYTHON_VERSION} pytest${PYTEST_VERSION:-">=6,!=7.0.0,!=7.0.1"} "pytest-cov>=3.0.0" pytest-qt${PYTESTQT_VERSION:-}
+mamba create -q -n test-env-${BINDING} python=${PYTHON_VERSION} pytest${PYTEST_VERSION:-">=6,!=7.0.0,!=7.0.1"} "pytest-cov>=3.0.0" pytest-qt${PYTESTQT_VERSION:-}
 conda activate test-env-${BINDING}
 
 if [ "$USE_CONDA" = "Yes" ]; then
 
     if [ "${1}" = "pyqt5" ]; then
-        conda install -q qt=${PYQT5_QT_VERSION} pyqt=${PYQT5_VERSION}
+        mamba install -q qt=${PYQT5_QT_VERSION} pyqt=${PYQT5_VERSION}
     elif [ "${1}" = "pyside2" ]; then
-        conda install -q qt=${PYSIDE2_QT_VERSION} pyside2=${PYSIDE2_VERSION}
+        mamba install -q qt=${PYSIDE2_QT_VERSION} pyside2=${PYSIDE2_VERSION}
     elif [ "${1}" = "pyside6" ]; then
-        conda install -q qt6-main=${PYSIDE6_QT_VERSION} pyside6=${PYSIDE6_VERSION}
+        mamba install -q qt6-main=${PYSIDE6_QT_VERSION} pyside6=${PYSIDE6_VERSION}
     else
         exit 1
     fi
@@ -56,7 +56,7 @@ python -bb -X dev -W error -m build
 echo dist/*.whl | xargs -I % python -bb -X dev -W error -W "ignore::DeprecationWarning:pip._internal.locations._distutils" -W "ignore::DeprecationWarning:distutils.command.install" -m pip install --upgrade %
 
 # Print environment information
-conda list
+mamba list
 
 # Run tests
 mkdir -p temp_test_dir