diff --git a/contracts/utils/FloatMath.sol b/contracts/utils/FloatMath.sol
index 357f461..f88eba0 100644
--- a/contracts/utils/FloatMath.sol
+++ b/contracts/utils/FloatMath.sol
@@ -3,7 +3,7 @@
  * ABDK Math 64.64 Smart Contract Library.  Copyright © 2019 by ABDK Consulting.
  * Author: Mikhail Vladimirov <mikhail.vladimirov@gmail.com>
  */
-pragma solidity ^0.5.0 || ^0.6.0 || ^0.7.0;
+pragma solidity ^0.6.0;
 
 /**
  * Smart contract library of mathematical functions operating with signed