diff --git a/HEU_MET_FAST_003/HEU_MET_FAST_003.py b/HEU_MET_FAST_003/HEU_MET_FAST_003.py
index 9fc7eed..5397db1 100644
--- a/HEU_MET_FAST_003/HEU_MET_FAST_003.py
+++ b/HEU_MET_FAST_003/HEU_MET_FAST_003.py
@@ -119,7 +119,7 @@
     k_solver = NonLinearKEigenSolver(
         lbs_problem=phys,
         nl_max_its=500,
-        nl_abs_tol=1.0e-9,
+        nl_abs_tol=1.0e-10,
     )
     k_solver.Initialize()
     k_solver.Execute()