diff --git a/src/problem.rs b/src/problem.rs
index 7e97747..ca2c8d3 100644
--- a/src/problem.rs
+++ b/src/problem.rs
@@ -1,5 +1,5 @@
 use nalgebra::SVector;
-use roots::{find_root_brent, SimpleConvergency};
+use roots::{find_root_brent, DebugConvergency};
 
 use super::callback::Callback;
 use super::controller::{Controller, PIController};
@@ -30,7 +30,7 @@ where
         }
     }
     pub fn solve(&mut self) -> Solution<S, D> {
-        let mut convergency = SimpleConvergency{ eps: 1e-12, max_iter: 10000 };
+        let mut convergency = DebugConvergency::new(1e-12, 10000);
         let mut times: Vec<f64> = vec![self.ode.t];
         let mut states: Vec<SVector<f64, D>> = vec![self.ode.y];
         let mut dense_coefficients: Vec<Vec<SVector<f64, D>>> = Vec::new();