diff --git a/.test-conda-env-py3.yml b/.test-conda-env-py3.yml
index 675a8dffad07ec92a1ea14d99bdb34445741a7a2..c95608f48d118948bd788cd5a0e57bcad439a02e 100644
--- a/.test-conda-env-py3.yml
+++ b/.test-conda-env-py3.yml
@@ -1,10 +1,10 @@
 name: test-conda-env-py3
 channels:
 - conda-forge
-- defaults
+- nodefaults
 dependencies:
 - git
-- conda-forge::numpy
+- numpy
 
 # to avoid conflict with system openmpi's libhwloc
 - libhwloc=1