diff --git a/.github/workflows/conda-lock.yml b/.github/workflows/conda-lock.yml
index d9b63e8d9..d8db90363 100644
--- a/.github/workflows/conda-lock.yml
+++ b/.github/workflows/conda-lock.yml
@@ -25,7 +25,7 @@ jobs:
         run: python3 -m pip install conda-lock
 
       - name: Update conda
-        run: conda update -q conda
+        run: conda update --channel conda-forge --quiet conda
 
       - name: Hash existing lock files
         run: |
diff --git a/cset-workflow/requirements/environment.yml b/cset-workflow/requirements/environment.yml
index 7a93dcc9b..a942b7edb 100644
--- a/cset-workflow/requirements/environment.yml
+++ b/cset-workflow/requirements/environment.yml
@@ -1,6 +1,7 @@
 name: cset-workflow
 channels:
   - conda-forge
+  - nodefaults
 dependencies:
   # Runtime dependencies
   - cset
diff --git a/requirements/environment.yml b/requirements/environment.yml
index 070b1f8c5..4e32cdf74 100644
--- a/requirements/environment.yml
+++ b/requirements/environment.yml
@@ -1,6 +1,7 @@
 name: cset-dev
 channels:
   - conda-forge
+  - nodefaults
 dependencies:
   # Runtime dependencies
   - numpy