diff --git a/.github/workflows/push_tests_mac.yml b/.github/workflows/push_tests_mac.yml
index d27d91b..9504f8c 100644
--- a/.github/workflows/push_tests_mac.yml
+++ b/.github/workflows/push_tests_mac.yml
@@ -13,7 +13,7 @@ jobs:
         shell: bash -el {0}
 
     name: Test CyRK on MacOS
-    runs-on: macos-latest
+    runs-on: macos-12.7.2
     strategy:
       matrix:
         python-version:
diff --git a/Tests/C_Cython_Tests/test_c_cython.py b/Tests/C_Cython_Tests/test_c_cython.py
index 8d48acc..21e12a8 100644
--- a/Tests/C_Cython_Tests/test_c_cython.py
+++ b/Tests/C_Cython_Tests/test_c_cython.py
@@ -550,11 +550,11 @@ def correct_answer(t, c1_, c2_):
     real_answer = correct_answer(CySolverAccuracyTestInst.t, c1, c2)
 
     if rk_method == 0:
-        assert np.allclose(CySolverAccuracyTestInst.y, real_answer, rtol=1.0e-2, atol=1.0e-3)
+        assert np.allclose(CySolverAccuracyTestInst.y, real_answer, rtol=1.0e-3, atol=1.0e-6)
     elif rk_method == 1:
-        assert np.allclose(CySolverAccuracyTestInst.y, real_answer, rtol=1.0e-2, atol=1.0e-3)
+        assert np.allclose(CySolverAccuracyTestInst.y, real_answer, rtol=1.0e-4, atol=1.0e-7)
     else:
-        assert np.allclose(CySolverAccuracyTestInst.y, real_answer, rtol=1.0e-2, atol=1.0e-3)
+        assert np.allclose(CySolverAccuracyTestInst.y, real_answer, rtol=1.0e-5, atol=1.0e-8)
 
     # Check the accuracy of the results
     # import matplotlib.pyplot as plt