diff --git a/tests/test_surrogate.py b/tests/test_surrogate.py
index c1a5d2d0..da883a48 100644
--- a/tests/test_surrogate.py
+++ b/tests/test_surrogate.py
@@ -342,6 +342,7 @@ def test_mnist_static(mpi_tmp_path):
     )
 
 
+@pytest.mark.mpi(min_size=4)
 def test_mnist_dynamic(mpi_tmp_path):
     """Test static surrogate using a torch convolutional network on the MNIST dataset."""
     num_generations = 3  # Number of generations