diff --git a/.github/workflows/run_all_tests.yml b/.github/workflows/run_all_tests.yml
index 8df190d55..b713f4763 100644
--- a/.github/workflows/run_all_tests.yml
+++ b/.github/workflows/run_all_tests.yml
@@ -165,13 +165,12 @@ jobs:
           auto-update-conda: true
           python-version: ${{ matrix.python-ver }}
           channels: conda-forge
-          mamba-version: "*"
 
       - name: Install build dependencies
         run: |
           conda config --set always_yes yes --set changeps1 no
           conda info
-          mamba install -c conda-forge "tox>=4"
+          conda install -c conda-forge "tox>=4"
 
       - name: Conda reporting
         run: |
@@ -229,7 +228,6 @@ jobs:
           python-version: ${{ matrix.python-ver }}
           channels: conda-forge
           auto-activate-base: false
-          mamba-version: "*"
 
       - name: Install run dependencies
         run: |
diff --git a/.github/workflows/run_coverage.yml b/.github/workflows/run_coverage.yml
index bd2eeb921..08b6c59ea 100644
--- a/.github/workflows/run_coverage.yml
+++ b/.github/workflows/run_coverage.yml
@@ -101,7 +101,6 @@ jobs:
           python-version: ${{ matrix.python-ver }}
           channels: conda-forge
           auto-activate-base: false
-          mamba-version: "*"
 
       - name: Install run dependencies
         run: |
diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
index 5e0b3bff2..2e94bcb62 100644
--- a/.github/workflows/run_tests.yml
+++ b/.github/workflows/run_tests.yml
@@ -139,13 +139,12 @@ jobs:
           auto-update-conda: true
           python-version: ${{ matrix.python-ver }}
           channels: conda-forge
-          mamba-version: "*"
 
       - name: Install build dependencies
         run: |
           conda config --set always_yes yes --set changeps1 no
           conda info
-          mamba install -c conda-forge "tox>=4"
+          conda install -c conda-forge "tox>=4"
 
       - name: Conda reporting
         run: |
@@ -239,7 +238,6 @@ jobs:
           python-version: ${{ matrix.python-ver }}
           channels: conda-forge
           auto-activate-base: false
-          mamba-version: "*"
 
       - name: Install run dependencies
         run: |