diff --git a/contracts/StatefulSponge.sol b/contracts/StatefulSponge.sol
index 1ef1046..fe44509 100644
--- a/contracts/StatefulSponge.sol
+++ b/contracts/StatefulSponge.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.15;
+pragma solidity ^0.8.0;
 
 import { LibKeccak } from "contracts/lib/LibKeccak.sol";
 
diff --git a/contracts/lib/LibKeccak.sol b/contracts/lib/LibKeccak.sol
index 1fdd0d9..86130d7 100644
--- a/contracts/lib/LibKeccak.sol
+++ b/contracts/lib/LibKeccak.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.15;
+pragma solidity ^0.8.0;
 
 /// @title LibKeccak
 /// @notice An EVM implementation of the Keccak-f[1600] permutation.