diff --git a/gradunwarp/core/tests/data/siemens_B_output.npz b/gradunwarp/core/tests/data/siemens_B_output.npz
index 7cf6b96..558bde7 100644
Binary files a/gradunwarp/core/tests/data/siemens_B_output.npz and b/gradunwarp/core/tests/data/siemens_B_output.npz differ
diff --git a/gradunwarp/core/tests/test_regression.py b/gradunwarp/core/tests/test_regression.py
index 5901fa7..d51f6e4 100644
--- a/gradunwarp/core/tests/test_regression.py
+++ b/gradunwarp/core/tests/test_regression.py
@@ -24,5 +24,5 @@ def test_siemens_B():
         beta_d = getattr(siemens_coeffs, f"beta_{d}")
         bd = siemens_B(alpha_d, beta_d, r, cos_theta, theta, phi, R0)
 
-        # changes in legendre function is causing differences at 6th decimal
-        assert_array_almost_equal(ref_b[f"b{d}"], bd, decimal=4)
+        # changes in legendre function is causing differences at 5th decimal
+        assert_array_almost_equal(ref_b[f"b{d}"], bd, decimal=5)