diff --git a/tests/test_coef_pval.py b/tests/test_coef_pval.py
index b07917b6..a15d2658 100644
--- a/tests/test_coef_pval.py
+++ b/tests/test_coef_pval.py
@@ -8,6 +8,8 @@
 
 from ccc.coef import ccc
 
+IN_GITHUB_ACTIONS = os.getenv("GITHUB_ACTIONS") == "true"
+
 
 def test_cm_basic_pvalue_n_permutations_not_given():
     # Prepare
@@ -241,6 +243,7 @@ def test_cm_single_argument_is_matrix():
 
 
 @pytest.mark.skipif(os.cpu_count() < 2, reason="requires at least 2 cores")
+@pytest.mark.skipif(IN_GITHUB_ACTIONS, reason="Test doesn't work in Github Actions.")
 def test_cm_large_n_objects_pvalue_permutations_is_parallelized():
     # Prepare
     rs = np.random.RandomState(0)
@@ -263,6 +266,7 @@ def test_cm_large_n_objects_pvalue_permutations_is_parallelized():
 
 
 @pytest.mark.skipif(os.cpu_count() < 2, reason="requires at least 2 cores")
+@pytest.mark.skipif(IN_GITHUB_ACTIONS, reason="Test doesn't work in Github Actions.")
 def test_cm_medium_n_objects_with_many_pvalue_permutations_is_parallelized():
     # Prepare
     rs = np.random.RandomState(0)