diff --git a/tests/test_ch13_stroop.py b/tests/test_ch13_stroop.py
index 5d25f84..4c51da2 100644
--- a/tests/test_ch13_stroop.py
+++ b/tests/test_ch13_stroop.py
@@ -33,4 +33,4 @@ def test_stroop_effect_and_mixed_model():
     coef = res.params.get("C(condition)[T.incongruent]")
     pval = res.pvalues.get("C(condition)[T.incongruent]")
     assert 0.12 < coef < 0.23
-    assert pval < 1e-6
\ No newline at end of file
+    assert pval < 1e-4
\ No newline at end of file