diff --git a/.github/workflows/ab_tests.yml b/.github/workflows/ab_tests.yml
index 51e3f6a0db..d1d190dd50 100644
--- a/.github/workflows/ab_tests.yml
+++ b/.github/workflows/ab_tests.yml
@@ -77,6 +77,7 @@ jobs:
           use-mamba: true
           condarc-file: ci/condarc
           environment-file: AB_environments/${{ matrix.runtime-version }}.conda.yaml
+          conda-remove-defaults: "true"
 
       - name: Add test dependencies
         run: mamba env update --file ci/environment-test.yml
@@ -180,6 +181,7 @@ jobs:
           miniforge-version: latest
           use-mamba: true
           environment-file: ci/environment-dashboard.yml
+          conda-remove-defaults: "true"
 
       - name: Generate dashboards
         run: python dashboard.py -d benchmark.db -o static -b all
diff --git a/.github/workflows/geospatial.yml b/.github/workflows/geospatial.yml
index 73c35734b2..b5fe1a9568 100644
--- a/.github/workflows/geospatial.yml
+++ b/.github/workflows/geospatial.yml
@@ -34,6 +34,7 @@ jobs:
         condarc-file: ci/condarc
         python-version: "3.10"
         environment-file: ci/environment.yml
+        conda-remove-defaults: "true"
 
     - name: Add geospatial dependencies
       run: mamba env update --file ci/environment-geospatial.yml
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index b908e91eab..70c9206ca5 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -71,6 +71,7 @@ jobs:
           condarc-file: ci/condarc
           python-version: ${{ matrix.python_version }}
           environment-file: ci/environment.yml
+          conda-remove-defaults: "true"
 
       - name: Add extra packages to environment
         if: ${{ matrix.extra-env != '' }}
@@ -225,6 +226,7 @@ jobs:
           miniforge-version: latest
           use-mamba: true
           environment-file: ci/environment-dashboard.yml
+          conda-remove-defaults: "true"
 
       - name: Run detect regressions
         run: |
@@ -291,6 +293,7 @@ jobs:
           miniforge-version: latest
           use-mamba: true
           environment-file: ci/environment-dashboard.yml
+          conda-remove-defaults: "true"
 
       - name: Generate dashboards
         run: python dashboard.py -d benchmark.db -o static
diff --git a/.github/workflows/tpch.yml b/.github/workflows/tpch.yml
index 9aee411a85..25db2ffc66 100644
--- a/.github/workflows/tpch.yml
+++ b/.github/workflows/tpch.yml
@@ -56,6 +56,7 @@ jobs:
         condarc-file: ci/condarc
         python-version: "3.10"
         environment-file: ci/environment.yml
+        conda-remove-defaults: "true"
 
     - name: Add TPC-H non-dask dependencies
       run: mamba env update --file ci/environment-tpch-nondask.yml