diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 8f218cb..ebb97b2 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -18,7 +18,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+        # Exclude Windows for now since it causes MPI issues
+        # os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+        os: ["ubuntu-latest", "macos-latest"]
         python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
@@ -35,7 +37,7 @@ jobs:
         run: pip list
       - name: Run tests with pytest & nox
         run: |
-          nox -s test-${{ matrix.python-version }}
+          nox -s tests-${{ matrix.python-version }}
       # You only need to upload code coverage once to codecov unless you have a
       # more complex build that you need coverage for.
       # - name: Upload coverage to Codecov
diff --git a/noxfile.py b/noxfile.py
index b0dcbfa..7925ec4 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -1,10 +1,10 @@
 import nox
 
-@nox.session(python=["3.10", "3.11", "3.12", "3.13"])
-def test(session):
 
+@nox.session(python=["3.10", "3.11", "3.12", "3.13"])
+def tests(session):
     # install
-    session.install(".[test]")
+    session.install(".[tests]")
 
     # Run tests
     session.run("pytest")
diff --git a/pyproject.toml b/pyproject.toml
index ecff3e1..b566e62 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,6 +42,7 @@ dependencies = [
     "mpi4py",
     "neighpy",
     "numpy",
+    "openmpi",
     "schwimmbad",
     "scipy",
     "scikit-learn",
@@ -50,7 +51,7 @@ dependencies = [
 [project.optional-dependencies]
 lint = ["mypy", "ruff"]
 notebook = ["jupyterlab"]
-test = ["pytest"]
+tests = ["mpi4py", "openmpi", "pytest"]
 
 [project.urls]
 homepage = "https://tc1d.readthedocs.io/"
@@ -124,3 +125,4 @@ jupyterlab = ">=4.4.7,<5"
 ruff = ">=0.12.12,<0.13"
 hatchling = ">=1.27.0,<2"
 mypy = ">=1.17.1,<2"
+pip = ">=25.2,<26"
diff --git a/src/tc1d/__init__.py b/src/tc1d/__init__.py
index 6bd624a..646e7fe 100644
--- a/src/tc1d/__init__.py
+++ b/src/tc1d/__init__.py
@@ -1,6 +1,5 @@
+import importlib.metadata
 from .tc1d import init_params, prep_model
 
 # Versioning
-import importlib.metadata
-
 __version__ = importlib.metadata.version("tc1d")