diff --git a/foundry.toml b/foundry.toml
index dab6e97..96a61de 100644
--- a/foundry.toml
+++ b/foundry.toml
@@ -5,8 +5,7 @@ libs = ["lib"]
 evm_version = "shanghai"
 optimizer = true
 optimizer-runs = 10_000_000
-solc = "0.8.17"
-
+solc="0.8.17"
 
 [rpc_endpoints]
 sepolia = "${SEPOLIA_RPC_URL}"
diff --git a/src/EmergencyMultisig.sol b/src/EmergencyMultisig.sol
index 9765ef8..3fa966b 100644
--- a/src/EmergencyMultisig.sol
+++ b/src/EmergencyMultisig.sol
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
-pragma solidity 0.8.17;
+pragma solidity ^0.8.17;
 
 import {SafeCastUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/math/SafeCastUpgradeable.sol";
 
diff --git a/src/Multisig.sol b/src/Multisig.sol
index 7cd9ab6..2273f4b 100644
--- a/src/Multisig.sol
+++ b/src/Multisig.sol
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
-pragma solidity 0.8.17;
+pragma solidity ^0.8.17;
 
 import {SafeCastUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/math/SafeCastUpgradeable.sol";
 
diff --git a/src/PublicKeyRegistry.sol b/src/PublicKeyRegistry.sol
index bdf544a..f9df687 100644
--- a/src/PublicKeyRegistry.sol
+++ b/src/PublicKeyRegistry.sol
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
-pragma solidity 0.8.17;
+pragma solidity ^0.8.17;
 
 /// @title PublicKeyRegistry - Release 1, Build 1
 /// @author Aragon Association - 2024
diff --git a/src/interfaces/IEmergencyMultisig.sol b/src/interfaces/IEmergencyMultisig.sol
index c880cc8..90709cf 100644
--- a/src/interfaces/IEmergencyMultisig.sol
+++ b/src/interfaces/IEmergencyMultisig.sol
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
-pragma solidity 0.8.17;
+pragma solidity ^0.8.17;
 
 import {IDAO} from "@aragon/osx/core/dao/IDAO.sol";
 
diff --git a/src/interfaces/IMultisig.sol b/src/interfaces/IMultisig.sol
index 9ca5dcb..ba73eff 100644
--- a/src/interfaces/IMultisig.sol
+++ b/src/interfaces/IMultisig.sol
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
-pragma solidity 0.8.17;
+pragma solidity ^0.8.17;
 
 import {IDAO} from "@aragon/osx/core/dao/IDAO.sol";
 
@@ -28,10 +28,7 @@ interface IMultisig {
     /// @param _account The address of the user to check.
     /// @return Returns true if the account is allowed to vote.
     /// @dev The function assumes the queried proposal exists.
-    function canApprove(
-        uint256 _proposalId,
-        address _account
-    ) external view returns (bool);
+    function canApprove(uint256 _proposalId, address _account) external view returns (bool);
 
     /// @notice Checks if a proposal can be executed.
     /// @param _proposalId The ID of the proposal to be checked.
@@ -42,10 +39,7 @@ interface IMultisig {
     /// @param _proposalId The ID of the proposal.
     /// @param _account The account address to be checked.
     /// @return The vote option cast by a voter for a certain proposal.
-    function hasApproved(
-        uint256 _proposalId,
-        address _account
-    ) external view returns (bool);
+    function hasApproved(uint256 _proposalId, address _account) external view returns (bool);
 
     /// @notice Executes a proposal.
     /// @param _proposalId The ID of the proposal to be executed.
diff --git a/src/interfaces/ITaikoEssentialContract.sol b/src/interfaces/ITaikoEssentialContract.sol
new file mode 100644
index 0000000..3890642
--- /dev/null
+++ b/src/interfaces/ITaikoEssentialContract.sol
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.17;
+
+interface IEssentialContract {
+    /// @notice Pauses the contract.
+    function pause() external;
+
+    /// @notice Unpauses the contract.
+    function unpause() external;
+
+    function impl() external view returns (address);
+
+    /// @notice Returns true if the contract is paused, and false otherwise.
+    /// @return true if paused, false otherwise.
+    function paused() external view returns (bool);
+
+    function inNonReentrant() external view returns (bool);
+}
diff --git a/test/base/AragonTest.sol b/test/base/AragonTest.sol
index 0c86f1b..75e7efb 100644
--- a/test/base/AragonTest.sol
+++ b/test/base/AragonTest.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
-pragma solidity 0.8.17;
+pragma solidity ^0.8.17;
 
 import {IPluginSetup, PluginSetup} from "@aragon/osx/framework/plugin/setup/PluginSetup.sol";
 import {DAO} from "@aragon/osx/core/dao/DAO.sol";