diff --git a/.test-conda-env-py3.yml b/.test-conda-env-py3.yml
index df48ceb05de6ec1208c578c35c07a82068f590ed..093af16377bae0f95bf2acd4f796f6bd35773e3e 100644
--- a/.test-conda-env-py3.yml
+++ b/.test-conda-env-py3.yml
@@ -12,7 +12,7 @@ dependencies:
   - scipy
   - numpy
   - sympy
-  - matplotlib
+  - matplotlib-base
   - cgen
   - cython
   - toml