diff --git a/src/elo.rs b/src/elo.rs
index f380eed..a704c55 100644
--- a/src/elo.rs
+++ b/src/elo.rs
@@ -271,7 +271,7 @@ impl PlayerArena {
             &self.players[player1].2,
             &self.players[player2].2,
             outcome,
-            &EloConfig::new(),
+            &EloConfig { k: 10.0 },
         );
         self.players[player1].2 = np1;
         self.players[player2].2 = np2;