diff --git a/development/contracts/ForkableBridge.sol b/development/contracts/ForkableBridge.sol
index b9282d6d..69a52ea7 100644
--- a/development/contracts/ForkableBridge.sol
+++ b/development/contracts/ForkableBridge.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {PolygonZkEVMBridge, IBasePolygonZkEVMGlobalExitRoot} from "@RealityETH/zkevm-contracts/contracts/inheritedMainContracts/PolygonZkEVMBridge.sol";
diff --git a/development/contracts/ForkableGlobalExitRoot.sol b/development/contracts/ForkableGlobalExitRoot.sol
index d772a131..bc3f2766 100644
--- a/development/contracts/ForkableGlobalExitRoot.sol
+++ b/development/contracts/ForkableGlobalExitRoot.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {PolygonZkEVMGlobalExitRoot} from "@RealityETH/zkevm-contracts/contracts/inheritedMainContracts/PolygonZkEVMGlobalExitRoot.sol";
diff --git a/development/contracts/ForkableZkEVM.sol b/development/contracts/ForkableZkEVM.sol
index 6dff5fe6..acc17f4e 100644
--- a/development/contracts/ForkableZkEVM.sol
+++ b/development/contracts/ForkableZkEVM.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {PolygonZkEVM} from "@RealityETH/zkevm-contracts/contracts/inheritedMainContracts/PolygonZkEVM.sol";
diff --git a/development/contracts/ForkingManager.sol b/development/contracts/ForkingManager.sol
index f8160dbf..4e265a38 100644
--- a/development/contracts/ForkingManager.sol
+++ b/development/contracts/ForkingManager.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {ERC20PresetMinterPauser} from "@openzeppelin/contracts/token/ERC20/presets/ERC20PresetMinterPauser.sol";
diff --git a/development/contracts/ForkonomicToken.sol b/development/contracts/ForkonomicToken.sol
index a2c48fe1..0cc12f13 100644
--- a/development/contracts/ForkonomicToken.sol
+++ b/development/contracts/ForkonomicToken.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {ERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
diff --git a/development/contracts/interfaces/IForkableBridge.sol b/development/contracts/interfaces/IForkableBridge.sol
index ded2d02d..25c852bb 100644
--- a/development/contracts/interfaces/IForkableBridge.sol
+++ b/development/contracts/interfaces/IForkableBridge.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
diff --git a/development/contracts/interfaces/IForkableGlobalExitRoot.sol b/development/contracts/interfaces/IForkableGlobalExitRoot.sol
index cd469fc4..3ffa254e 100644
--- a/development/contracts/interfaces/IForkableGlobalExitRoot.sol
+++ b/development/contracts/interfaces/IForkableGlobalExitRoot.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {IForkableStructure} from "./IForkableStructure.sol";
diff --git a/development/contracts/interfaces/IForkableStructure.sol b/development/contracts/interfaces/IForkableStructure.sol
index 39a38f3f..19d8c264 100644
--- a/development/contracts/interfaces/IForkableStructure.sol
+++ b/development/contracts/interfaces/IForkableStructure.sol
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 pragma solidity ^0.8.17;
 
 interface IForkableStructure {
diff --git a/development/contracts/interfaces/IForkableZkEVM.sol b/development/contracts/interfaces/IForkableZkEVM.sol
index db357859..e9e16bde 100644
--- a/development/contracts/interfaces/IForkableZkEVM.sol
+++ b/development/contracts/interfaces/IForkableZkEVM.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {IForkableStructure} from "./IForkableStructure.sol";
diff --git a/development/contracts/interfaces/IForkingManager.sol b/development/contracts/interfaces/IForkingManager.sol
index 71e91a07..1d4fcd2b 100644
--- a/development/contracts/interfaces/IForkingManager.sol
+++ b/development/contracts/interfaces/IForkingManager.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {IForkableStructure} from "./IForkableStructure.sol";
diff --git a/development/contracts/interfaces/IForkonomicToken.sol b/development/contracts/interfaces/IForkonomicToken.sol
index cc37a478..ccb0dd85 100644
--- a/development/contracts/interfaces/IForkonomicToken.sol
+++ b/development/contracts/interfaces/IForkonomicToken.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {IForkableStructure} from "./IForkableStructure.sol";
diff --git a/development/contracts/lib/BridgeAssetOperations.sol b/development/contracts/lib/BridgeAssetOperations.sol
index ae258d98..30e46337 100644
--- a/development/contracts/lib/BridgeAssetOperations.sol
+++ b/development/contracts/lib/BridgeAssetOperations.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 import {PolygonZkEVMBridge} from "@RealityETH/zkevm-contracts/contracts/inheritedMainContracts/PolygonZkEVMBridge.sol";
 import {TokenWrapped} from "@RealityETH/zkevm-contracts/contracts/lib/TokenWrapped.sol";
diff --git a/development/contracts/lib/CreateChildren.sol b/development/contracts/lib/CreateChildren.sol
index b39d2280..c791a75c 100644
--- a/development/contracts/lib/CreateChildren.sol
+++ b/development/contracts/lib/CreateChildren.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {StorageSlot} from "@openzeppelin/contracts/utils/StorageSlot.sol";
diff --git a/development/contracts/mixin/ForkableStructure.sol b/development/contracts/mixin/ForkableStructure.sol
index 6bf92f93..9c87c799 100644
--- a/development/contracts/mixin/ForkableStructure.sol
+++ b/development/contracts/mixin/ForkableStructure.sol
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 pragma solidity ^0.8.17;
 
 import {IForkableStructure} from "../interfaces/IForkableStructure.sol";