diff --git a/contracts/deploy/upgrade-all.ts b/contracts/deploy/upgrade-all.ts
index 74433c413..dfd0d882c 100644
--- a/contracts/deploy/upgrade-all.ts
+++ b/contracts/deploy/upgrade-all.ts
@@ -98,11 +98,11 @@ const deployUpgradeAll: DeployFunction = async (hre: HardhatRuntimeEnvironment)
   await upgrade(disputeKitShutter, "reinitialize", [wETH.address]);
   await upgrade(disputeKitGated, "reinitialize", [wETH.address]);
   await upgrade(disputeKitGatedShutter, "reinitialize", [wETH.address]);
-  await upgrade(disputeTemplateRegistry, "initialize2", []);
-  await upgrade(evidence, "initialize2", []);
+  await upgrade(disputeTemplateRegistry, "reinitialize", []);
+  await upgrade(evidence, "reinitialize", []);
   await upgrade(core, "reinitialize", [wETH.address]);
-  await upgrade(policyRegistry, "initialize2", []);
-  await upgrade(sortition, "initialize4", []);
+  await upgrade(policyRegistry, "reinitialize", []);
+  await upgrade(sortition, "reinitialize", []);
 };
 
 deployUpgradeAll.tags = ["UpgradeAll"];
diff --git a/contracts/src/arbitration/DisputeTemplateRegistry.sol b/contracts/src/arbitration/DisputeTemplateRegistry.sol
index b9354aa0a..8d3d68d58 100644
--- a/contracts/src/arbitration/DisputeTemplateRegistry.sol
+++ b/contracts/src/arbitration/DisputeTemplateRegistry.sol
@@ -8,7 +8,7 @@ import "./interfaces/IDisputeTemplateRegistry.sol";
 /// @title Dispute Template Registry
 /// @dev A contract to maintain a registry of dispute templates.
 contract DisputeTemplateRegistry is IDisputeTemplateRegistry, UUPSProxiable, Initializable {
-    string public constant override version = "0.8.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *             Storage               * //
@@ -40,14 +40,10 @@ contract DisputeTemplateRegistry is IDisputeTemplateRegistry, UUPSProxiable, Ini
 
     /// @dev Initializer
     /// @param _owner Owner of the contract.
-    function initialize(address _owner) external reinitializer(1) {
+    function initialize(address _owner) external initializer {
         owner = _owner;
     }
 
-    function initialize2() external reinitializer(2) {
-        // NOP
-    }
-
     // ************************ //
     // *      Governance      * //
     // ************************ //
diff --git a/contracts/src/arbitration/KlerosCore.sol b/contracts/src/arbitration/KlerosCore.sol
index 912a57269..4dd30f61b 100644
--- a/contracts/src/arbitration/KlerosCore.sol
+++ b/contracts/src/arbitration/KlerosCore.sol
@@ -8,7 +8,7 @@ import {KlerosCoreBase, IDisputeKit, ISortitionModule, IERC20} from "./KlerosCor
 /// Core arbitrator contract for Kleros v2.
 /// Note that this contract trusts the PNK token, the dispute kit and the sortition module contracts.
 contract KlerosCore is KlerosCoreBase {
-    string public constant override version = "0.10.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *            Constructor            * //
@@ -43,7 +43,7 @@ contract KlerosCore is KlerosCoreBase {
         bytes memory _sortitionExtraData,
         ISortitionModule _sortitionModuleAddress,
         address _wNative
-    ) external reinitializer(1) {
+    ) external initializer {
         __KlerosCoreBase_initialize(
             _owner,
             _guardian,
@@ -59,10 +59,6 @@ contract KlerosCore is KlerosCoreBase {
         );
     }
 
-    function reinitialize(address _wNative) external reinitializer(6) {
-        wNative = _wNative;
-    }
-
     // ************************************* //
     // *             Governance            * //
     // ************************************* //
diff --git a/contracts/src/arbitration/KlerosCoreNeo.sol b/contracts/src/arbitration/KlerosCoreNeo.sol
index ebfd1bb72..8f0a413b3 100644
--- a/contracts/src/arbitration/KlerosCoreNeo.sol
+++ b/contracts/src/arbitration/KlerosCoreNeo.sol
@@ -9,7 +9,7 @@ import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
 /// Core arbitrator contract for Kleros v2.
 /// Note that this contract trusts the PNK token, the dispute kit and the sortition module contracts.
 contract KlerosCoreNeo is KlerosCoreBase {
-    string public constant override version = "0.10.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *             Storage               * //
@@ -70,10 +70,6 @@ contract KlerosCoreNeo is KlerosCoreBase {
         jurorNft = _jurorNft;
     }
 
-    function reinitialize(address _wNative) external reinitializer(6) {
-        wNative = _wNative;
-    }
-
     // ************************************* //
     // *             Governance            * //
     // ************************************* //
diff --git a/contracts/src/arbitration/PolicyRegistry.sol b/contracts/src/arbitration/PolicyRegistry.sol
index acea8d01b..9c8d09f3e 100644
--- a/contracts/src/arbitration/PolicyRegistry.sol
+++ b/contracts/src/arbitration/PolicyRegistry.sol
@@ -7,7 +7,7 @@ import "../proxy/Initializable.sol";
 /// @title PolicyRegistry
 /// @dev A contract to maintain a policy for each court.
 contract PolicyRegistry is UUPSProxiable, Initializable {
-    string public constant override version = "0.8.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *              Events               * //
@@ -47,14 +47,10 @@ contract PolicyRegistry is UUPSProxiable, Initializable {
 
     /// @dev Constructs the `PolicyRegistry` contract.
     /// @param _owner The owner's address.
-    function initialize(address _owner) external reinitializer(1) {
+    function initialize(address _owner) external initializer {
         owner = _owner;
     }
 
-    function initialize2() external reinitializer(2) {
-        // NOP
-    }
-
     // ************************************* //
     // *            Governance             * //
     // ************************************* //
diff --git a/contracts/src/arbitration/SortitionModule.sol b/contracts/src/arbitration/SortitionModule.sol
index ae89335b0..bd0f6e007 100644
--- a/contracts/src/arbitration/SortitionModule.sol
+++ b/contracts/src/arbitration/SortitionModule.sol
@@ -7,7 +7,7 @@ import {SortitionModuleBase, KlerosCore, IRNG} from "./SortitionModuleBase.sol";
 /// @title SortitionModule
 /// @dev A factory of trees that keeps track of staked values for sortition.
 contract SortitionModule is SortitionModuleBase {
-    string public constant override version = "0.9.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *            Constructor            * //
@@ -30,14 +30,10 @@ contract SortitionModule is SortitionModuleBase {
         uint256 _minStakingTime,
         uint256 _maxDrawingTime,
         IRNG _rng
-    ) external reinitializer(1) {
+    ) external initializer {
         __SortitionModuleBase_initialize(_owner, _core, _minStakingTime, _maxDrawingTime, _rng);
     }
 
-    function initialize4() external reinitializer(4) {
-        // NOP
-    }
-
     // ************************************* //
     // *             Governance            * //
     // ************************************* //
diff --git a/contracts/src/arbitration/SortitionModuleNeo.sol b/contracts/src/arbitration/SortitionModuleNeo.sol
index 4d28f97b5..66dbba7e5 100644
--- a/contracts/src/arbitration/SortitionModuleNeo.sol
+++ b/contracts/src/arbitration/SortitionModuleNeo.sol
@@ -7,7 +7,7 @@ import {SortitionModuleBase, KlerosCore, IRNG, StakingResult} from "./SortitionM
 /// @title SortitionModuleNeo
 /// @dev A factory of trees that keeps track of staked values for sortition.
 contract SortitionModuleNeo is SortitionModuleBase {
-    string public constant override version = "0.9.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *             Storage               * //
@@ -48,10 +48,6 @@ contract SortitionModuleNeo is SortitionModuleBase {
         maxTotalStaked = _maxTotalStaked;
     }
 
-    function initialize4() external reinitializer(4) {
-        // NOP
-    }
-
     // ************************************* //
     // *             Governance            * //
     // ************************************* //
diff --git a/contracts/src/arbitration/devtools/KlerosCoreRuler.sol b/contracts/src/arbitration/devtools/KlerosCoreRuler.sol
index 9350ebd57..42a428299 100644
--- a/contracts/src/arbitration/devtools/KlerosCoreRuler.sol
+++ b/contracts/src/arbitration/devtools/KlerosCoreRuler.sol
@@ -13,7 +13,7 @@ import "../../libraries/Constants.sol";
 contract KlerosCoreRuler is IArbitratorV2, UUPSProxiable, Initializable {
     using SafeERC20 for IERC20;
 
-    string public constant override version = "0.8.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *         Enums / Structs           * //
@@ -175,11 +175,7 @@ contract KlerosCoreRuler is IArbitratorV2, UUPSProxiable, Initializable {
     /// @param _owner The owner's address.
     /// @param _pinakion The address of the token contract.
     /// @param _courtParameters Numeric parameters of General court (minStake, alpha, feeForJuror and jurorsForCourtJump respectively).
-    function initialize(
-        address _owner,
-        IERC20 _pinakion,
-        uint256[4] memory _courtParameters
-    ) external reinitializer(1) {
+    function initialize(address _owner, IERC20 _pinakion, uint256[4] memory _courtParameters) external initializer {
         owner = _owner;
         pinakion = _pinakion;
 
@@ -210,10 +206,6 @@ contract KlerosCoreRuler is IArbitratorV2, UUPSProxiable, Initializable {
         );
     }
 
-    function initialize2() external reinitializer(2) {
-        // NOP
-    }
-
     // ************************************* //
     // *             Governance            * //
     // ************************************* //
diff --git a/contracts/src/arbitration/dispute-kits/DisputeKitClassic.sol b/contracts/src/arbitration/dispute-kits/DisputeKitClassic.sol
index af89d2816..dd2edbab8 100644
--- a/contracts/src/arbitration/dispute-kits/DisputeKitClassic.sol
+++ b/contracts/src/arbitration/dispute-kits/DisputeKitClassic.sol
@@ -11,7 +11,7 @@ import {DisputeKitClassicBase, KlerosCore} from "./DisputeKitClassicBase.sol";
 /// - an incentive system: equal split between coherent votes,
 /// - an appeal system: fund 2 choices only, vote on any choice.
 contract DisputeKitClassic is DisputeKitClassicBase {
-    string public constant override version = "0.13.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *            Constructor            * //
@@ -32,14 +32,10 @@ contract DisputeKitClassic is DisputeKitClassicBase {
         KlerosCore _core,
         address _wNative,
         uint256 _jumpDisputeKitID
-    ) external reinitializer(1) {
+    ) external initializer {
         __DisputeKitClassicBase_initialize(_owner, _core, _wNative, _jumpDisputeKitID);
     }
 
-    function reinitialize(uint256 _jumpDisputeKitID) external reinitializer(10) {
-        jumpDisputeKitID = _jumpDisputeKitID;
-    }
-
     // ************************ //
     // *      Governance      * //
     // ************************ //
diff --git a/contracts/src/arbitration/dispute-kits/DisputeKitGated.sol b/contracts/src/arbitration/dispute-kits/DisputeKitGated.sol
index 9097a8fd3..8abfdecac 100644
--- a/contracts/src/arbitration/dispute-kits/DisputeKitGated.sol
+++ b/contracts/src/arbitration/dispute-kits/DisputeKitGated.sol
@@ -27,7 +27,7 @@ interface IBalanceHolderERC1155 {
 /// - an incentive system: equal split between coherent votes,
 /// - an appeal system: fund 2 choices only, vote on any choice.
 contract DisputeKitGated is DisputeKitClassicBase {
-    string public constant override version = "0.13.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *            Constructor            * //
@@ -48,14 +48,10 @@ contract DisputeKitGated is DisputeKitClassicBase {
         KlerosCore _core,
         address _wNative,
         uint256 _jumpDisputeKitID
-    ) external reinitializer(1) {
+    ) external initializer {
         __DisputeKitClassicBase_initialize(_owner, _core, _wNative, _jumpDisputeKitID);
     }
 
-    function reinitialize(uint256 _jumpDisputeKitID) external reinitializer(10) {
-        jumpDisputeKitID = _jumpDisputeKitID;
-    }
-
     // ************************ //
     // *      Governance      * //
     // ************************ //
diff --git a/contracts/src/arbitration/dispute-kits/DisputeKitGatedShutter.sol b/contracts/src/arbitration/dispute-kits/DisputeKitGatedShutter.sol
index 67d9ddbea..573f81f11 100644
--- a/contracts/src/arbitration/dispute-kits/DisputeKitGatedShutter.sol
+++ b/contracts/src/arbitration/dispute-kits/DisputeKitGatedShutter.sol
@@ -28,7 +28,7 @@ interface IBalanceHolderERC1155 {
 /// - an incentive system: equal split between coherent votes,
 /// - an appeal system: fund 2 choices only, vote on any choice.
 contract DisputeKitGatedShutter is DisputeKitClassicBase {
-    string public constant override version = "0.13.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *             Storage               * //
@@ -82,14 +82,10 @@ contract DisputeKitGatedShutter is DisputeKitClassicBase {
         KlerosCore _core,
         address _wNative,
         uint256 _jumpDisputeKitID
-    ) external reinitializer(1) {
+    ) external initializer {
         __DisputeKitClassicBase_initialize(_owner, _core, _wNative, _jumpDisputeKitID);
     }
 
-    function reinitialize(uint256 _jumpDisputeKitID) external reinitializer(10) {
-        jumpDisputeKitID = _jumpDisputeKitID;
-    }
-
     // ************************ //
     // *      Governance      * //
     // ************************ //
diff --git a/contracts/src/arbitration/dispute-kits/DisputeKitShutter.sol b/contracts/src/arbitration/dispute-kits/DisputeKitShutter.sol
index b8bef461f..bbcb28b24 100644
--- a/contracts/src/arbitration/dispute-kits/DisputeKitShutter.sol
+++ b/contracts/src/arbitration/dispute-kits/DisputeKitShutter.sol
@@ -12,7 +12,7 @@ import {DisputeKitClassicBase, KlerosCore} from "./DisputeKitClassicBase.sol";
 /// - an incentive system: equal split between coherent votes,
 /// - an appeal system: fund 2 choices only, vote on any choice.
 contract DisputeKitShutter is DisputeKitClassicBase {
-    string public constant override version = "0.13.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *             Storage               * //
@@ -66,14 +66,10 @@ contract DisputeKitShutter is DisputeKitClassicBase {
         KlerosCore _core,
         address _wNative,
         uint256 _jumpDisputeKitID
-    ) external reinitializer(1) {
+    ) external initializer {
         __DisputeKitClassicBase_initialize(_owner, _core, _wNative, _jumpDisputeKitID);
     }
 
-    function reinitialize(uint256 _jumpDisputeKitID) external reinitializer(10) {
-        jumpDisputeKitID = _jumpDisputeKitID;
-    }
-
     // ************************ //
     // *      Governance      * //
     // ************************ //
diff --git a/contracts/src/arbitration/dispute-kits/DisputeKitSybilResistant.sol b/contracts/src/arbitration/dispute-kits/DisputeKitSybilResistant.sol
index 66553f02a..10cc67c5c 100644
--- a/contracts/src/arbitration/dispute-kits/DisputeKitSybilResistant.sol
+++ b/contracts/src/arbitration/dispute-kits/DisputeKitSybilResistant.sol
@@ -18,7 +18,7 @@ interface IProofOfHumanity {
 /// - an incentive system: equal split between coherent votes,
 /// - an appeal system: fund 2 choices only, vote on any choice.
 contract DisputeKitSybilResistant is DisputeKitClassicBase {
-    string public constant override version = "0.13.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *             Storage               * //
@@ -47,7 +47,7 @@ contract DisputeKitSybilResistant is DisputeKitClassicBase {
         IProofOfHumanity _poh,
         address _wNative,
         uint256 _jumpDisputeKitID
-    ) external reinitializer(1) {
+    ) external initializer {
         __DisputeKitClassicBase_initialize(_owner, _core, _wNative, _jumpDisputeKitID);
         poh = _poh;
         singleDrawPerJuror = true;
diff --git a/contracts/src/arbitration/evidence/EvidenceModule.sol b/contracts/src/arbitration/evidence/EvidenceModule.sol
index d1eb5f99c..8321e55ba 100644
--- a/contracts/src/arbitration/evidence/EvidenceModule.sol
+++ b/contracts/src/arbitration/evidence/EvidenceModule.sol
@@ -9,7 +9,7 @@ import "../../proxy/Initializable.sol";
 
 /// @title Evidence Module
 contract EvidenceModule is IEvidence, Initializable, UUPSProxiable {
-    string public constant override version = "0.8.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *             Storage               * //
@@ -37,14 +37,10 @@ contract EvidenceModule is IEvidence, Initializable, UUPSProxiable {
 
     /// @dev Initializer.
     /// @param _owner The owner's address.
-    function initialize(address _owner) external reinitializer(1) {
+    function initialize(address _owner) external initializer {
         owner = _owner;
     }
 
-    function initialize2() external reinitializer(2) {
-        // NOP
-    }
-
     // ************************ //
     // *      Governance      * //
     // ************************ //
diff --git a/contracts/src/arbitration/university/KlerosCoreUniversity.sol b/contracts/src/arbitration/university/KlerosCoreUniversity.sol
index b2519fdd7..afe7fc4d4 100644
--- a/contracts/src/arbitration/university/KlerosCoreUniversity.sol
+++ b/contracts/src/arbitration/university/KlerosCoreUniversity.sol
@@ -15,7 +15,7 @@ import "../../libraries/Constants.sol";
 contract KlerosCoreUniversity is IArbitratorV2, UUPSProxiable, Initializable {
     using SafeERC20 for IERC20;
 
-    string public constant override version = "0.8.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *         Enums / Structs           * //
@@ -207,7 +207,7 @@ contract KlerosCoreUniversity is IArbitratorV2, UUPSProxiable, Initializable {
         uint256[4] memory _courtParameters,
         uint256[4] memory _timesPerPeriod,
         ISortitionModuleUniversity _sortitionModuleAddress
-    ) external reinitializer(1) {
+    ) external initializer {
         owner = _owner;
         instructor = _instructor;
         pinakion = _pinakion;
diff --git a/contracts/src/arbitration/university/SortitionModuleUniversity.sol b/contracts/src/arbitration/university/SortitionModuleUniversity.sol
index 63720eb18..66e815e4a 100644
--- a/contracts/src/arbitration/university/SortitionModuleUniversity.sol
+++ b/contracts/src/arbitration/university/SortitionModuleUniversity.sol
@@ -12,7 +12,7 @@ import "../../libraries/Constants.sol";
 /// @title SortitionModuleUniversity
 /// @dev An adapted version of the SortitionModule contract for educational purposes.
 contract SortitionModuleUniversity is ISortitionModuleUniversity, UUPSProxiable, Initializable {
-    string public constant override version = "0.8.0";
+    string public constant override version = "2.0.0";
 
     // ************************************* //
     // *         Enums / Structs           * //
@@ -87,7 +87,7 @@ contract SortitionModuleUniversity is ISortitionModuleUniversity, UUPSProxiable,
 
     /// @dev Initializer (constructor equivalent for upgradable contracts).
     /// @param _core The KlerosCore.
-    function initialize(address _owner, KlerosCoreUniversity _core) external reinitializer(1) {
+    function initialize(address _owner, KlerosCoreUniversity _core) external initializer {
         owner = _owner;
         core = _core;
     }
diff --git a/contracts/src/gateway/ForeignGateway.sol b/contracts/src/gateway/ForeignGateway.sol
index 712790d0d..366f3e6f0 100644
--- a/contracts/src/gateway/ForeignGateway.sol
+++ b/contracts/src/gateway/ForeignGateway.sol
@@ -81,7 +81,7 @@ contract ForeignGateway is IForeignGateway, UUPSProxiable, Initializable {
         address _veaOutbox,
         uint256 _homeChainID,
         address _homeGateway
-    ) external reinitializer(1) {
+    ) external initializer {
         owner = _owner;
         veaOutbox = _veaOutbox;
         homeChainID = _homeChainID;
diff --git a/contracts/src/gateway/HomeGateway.sol b/contracts/src/gateway/HomeGateway.sol
index d0062dc52..2a23913ef 100644
--- a/contracts/src/gateway/HomeGateway.sol
+++ b/contracts/src/gateway/HomeGateway.sol
@@ -72,7 +72,7 @@ contract HomeGateway is IHomeGateway, UUPSProxiable, Initializable {
         uint256 _foreignChainID,
         address _foreignGateway,
         IERC20 _feeToken
-    ) external reinitializer(1) {
+    ) external initializer {
         owner = _owner;
         arbitrator = _arbitrator;
         veaInbox = _veaInbox;
diff --git a/contracts/src/proxy/Initializable.sol b/contracts/src/proxy/Initializable.sol
index 47769a9f2..7bdf08eb4 100644
--- a/contracts/src/proxy/Initializable.sol
+++ b/contracts/src/proxy/Initializable.sol
@@ -93,7 +93,7 @@ abstract contract Initializable {
      * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
      * `onlyInitializing` functions can be used to initialize parent contracts.
      *
-     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
+     * Similar to `initializer()`, except that functions marked with `initializer` can be nested in the context of a
      * constructor.
      *
      * Emits an {Initialized} event.
diff --git a/contracts/src/proxy/mock/by-inheritance/UpgradedByInheritance.sol b/contracts/src/proxy/mock/by-inheritance/UpgradedByInheritance.sol
index c5f796995..b443051a8 100644
--- a/contracts/src/proxy/mock/by-inheritance/UpgradedByInheritance.sol
+++ b/contracts/src/proxy/mock/by-inheritance/UpgradedByInheritance.sol
@@ -20,7 +20,7 @@ contract UpgradedByInheritanceV1 is UUPSProxiable, Initializable {
         _disableInitializers();
     }
 
-    function initialize(address _owner) external virtual reinitializer(1) {
+    function initialize(address _owner) external virtual initializer {
         owner = _owner;
         counter = 1;
     }
@@ -61,7 +61,7 @@ contract UpgradedByInheritanceV3Bad is UpgradedByInheritanceV2 {
         _disableInitializers();
     }
 
-    function initializeV3() external reinitializer(1) {
+    function initializeV3() external initializer {
         // Wrong reinitializer version.
     }
 }
diff --git a/contracts/src/proxy/mock/by-rewrite/UpgradedByRewrite.sol b/contracts/src/proxy/mock/by-rewrite/UpgradedByRewrite.sol
index f5e5eae77..d8930796d 100644
--- a/contracts/src/proxy/mock/by-rewrite/UpgradedByRewrite.sol
+++ b/contracts/src/proxy/mock/by-rewrite/UpgradedByRewrite.sol
@@ -23,7 +23,7 @@ contract UpgradedByRewrite is UUPSProxiable, Initializable {
         _disableInitializers();
     }
 
-    function initialize(address _owner) external virtual reinitializer(1) {
+    function initialize(address _owner) external virtual initializer {
         owner = _owner;
         counter = 1;
     }