diff --git a/.github/workflows/ci_tests.yaml b/.github/workflows/ci_tests.yaml
index b6621fbf7c0..db0409f8c5a 100644
--- a/.github/workflows/ci_tests.yaml
+++ b/.github/workflows/ci_tests.yaml
@@ -76,7 +76,9 @@ jobs:
       # Install GMT and other required dependencies from conda-forge
       - name: Install dependencies
         shell: bash -l {0}
-        run: conda env update --file environment.yml
+        run: |
+          conda install gmt=6.1.1 numpy pandas xarray netCDF4 packaging \
+                        codecov coverage[toml] pylint pytest-cov pytest-mpl pytest>=6.0
 
       # Show installed pkg information for postmortem diagnostic
       - name: List installed packages