diff --git a/conda-envs/environment-test.yml b/conda-envs/environment-test.yml
index 6c57d5aed..326946995 100644
--- a/conda-envs/environment-test.yml
+++ b/conda-envs/environment-test.yml
@@ -1,7 +1,6 @@
 name: pymc-experimental-test
 channels:
 - conda-forge
-- nodefaults
 dependencies:
 - pip
 - pymc>=5.1.2
diff --git a/conda-envs/windows-environment-test.yml b/conda-envs/windows-environment-test.yml
index 0a5d813ac..b478665cd 100644
--- a/conda-envs/windows-environment-test.yml
+++ b/conda-envs/windows-environment-test.yml
@@ -1,7 +1,6 @@
 name: pymc-experimental-test
 channels:
 - conda-forge
-- nodefaults
 dependencies:
 - pip
 - pymc>=5.1.2