diff --git a/EvoCalculator.Core.Constants/Calculation.cs b/EvoCalculator.Core.Constants/Calculation.cs
index 62b3951..4db0556 100644
--- a/EvoCalculator.Core.Constants/Calculation.cs
+++ b/EvoCalculator.Core.Constants/Calculation.cs
@@ -13,5 +13,5 @@ public class Calculation
     public double VatValue = 0.2;
     public decimal MinBonus = 100;
     public double DeltaIRR = 0.02;
-    public double ESN = 1.271;
+    public double ESN = 1.3;
 }
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