diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dc22ac51ac17efa3458d2bb9ed3dfc897f97f5a1..f39642c5a8857e129e64343d211ec8c2e84e2914 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -83,7 +83,7 @@ Python 3 Conda Apple:
   - export CONDA_ENVIRONMENT=.test-conda-env-py3-macos.yml
   - export PYTEST_ADDOPTS=${PYTEST_ADDOPTS:--k-slowtest}
   - export REQUIREMENTS_TXT=.test-conda-env-py3-requirements.txt
-  - export CC=gcc
+  - export CC=clang
   - set -o xtrace
   - curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/build-and-test-py-project-within-miniconda.sh
   - ". ./build-and-test-py-project-within-miniconda.sh"
diff --git a/.test-conda-env-py3-macos.yml b/.test-conda-env-py3-macos.yml
index 6a41e88bdae78a8656bf4aa87788d01317c72331..eea9ddd7e59168d635c08f4a0f29ed04dc19ede5 100644
--- a/.test-conda-env-py3-macos.yml
+++ b/.test-conda-env-py3-macos.yml
@@ -10,12 +10,13 @@ dependencies:
 - pocl
 - islpy
 - pyopencl
-- python=3.6
+- python>=3.6
 - symengine=0.3.0
 - python-symengine=0.3.0
 - pyfmmlib
 # for OpenMP support in pyfmmlib
 - libgfortran>=3.0.1
-- gcc
+- clangdev
+- openmp
 - cython
 # things not in here: loopy boxtree pymbolic meshmode sumpy
diff --git a/.test-conda-env-py3.yml b/.test-conda-env-py3.yml
index 2ac856756e0df70b068c71d725c8999f0eaf3b03..8023391b5f8598a9c94677f2d5dcefd0c6537f5d 100644
--- a/.test-conda-env-py3.yml
+++ b/.test-conda-env-py3.yml
@@ -10,7 +10,7 @@ dependencies:
 - pocl
 - islpy
 - pyopencl
-- python=3.6
+- python>=3.6
 - symengine=0.3.0
 - python-symengine=0.3.0
 - pyfmmlib