diff --git a/contracts/LightweightStateV2.sol b/contracts/LightweightStateV2.sol
index cf4fa12..84ed5ea 100644
--- a/contracts/LightweightStateV2.sol
+++ b/contracts/LightweightStateV2.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.16;
 
 import "@rarimo/evm-bridge-contracts/bridge/proxy/UUPSSignableUpgradeable.sol";
diff --git a/contracts/QueryVerifier.sol b/contracts/QueryVerifier.sol
index f47ca31..ab7b20f 100644
--- a/contracts/QueryVerifier.sol
+++ b/contracts/QueryVerifier.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.16;
 
 import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
diff --git a/contracts/interfaces/ILightweightStateV2.sol b/contracts/interfaces/ILightweightStateV2.sol
index 53f4f97..6f838c4 100644
--- a/contracts/interfaces/ILightweightStateV2.sol
+++ b/contracts/interfaces/ILightweightStateV2.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.16;
 
 import "@iden3/contracts/interfaces/IState.sol";
diff --git a/contracts/interfaces/IQueryVerifier.sol b/contracts/interfaces/IQueryVerifier.sol
index a55344d..92df96d 100644
--- a/contracts/interfaces/IQueryVerifier.sol
+++ b/contracts/interfaces/IQueryVerifier.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.16;
 
 import "./IVerifiedSBT.sol";
diff --git a/contracts/interfaces/IVerifiedSBT.sol b/contracts/interfaces/IVerifiedSBT.sol
index a6be3d6..adbc1ca 100644
--- a/contracts/interfaces/IVerifiedSBT.sol
+++ b/contracts/interfaces/IVerifiedSBT.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.16;
 
 import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
diff --git a/contracts/interfaces/validators/IOffChainCircuitValidator.sol b/contracts/interfaces/validators/IOffChainCircuitValidator.sol
index a3c482b..97ccf56 100644
--- a/contracts/interfaces/validators/IOffChainCircuitValidator.sol
+++ b/contracts/interfaces/validators/IOffChainCircuitValidator.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.16;
 
 uint256 constant VALUES_ARR_SIZE = 64;
diff --git a/contracts/mock/LightweightStateV2Mock.sol b/contracts/mock/LightweightStateV2Mock.sol
index 8d6ca93..5292c3d 100644
--- a/contracts/mock/LightweightStateV2Mock.sol
+++ b/contracts/mock/LightweightStateV2Mock.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.16;
 
 import "../LightweightStateV2.sol";
diff --git a/contracts/validators/QueryMTPValidatorOffChain.sol b/contracts/validators/QueryMTPValidatorOffChain.sol
index a275ccc..9722a98 100644
--- a/contracts/validators/QueryMTPValidatorOffChain.sol
+++ b/contracts/validators/QueryMTPValidatorOffChain.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.16;
 
 import "./QueryValidatorOffChain.sol";
diff --git a/contracts/validators/QuerySigValidatorOffChain.sol b/contracts/validators/QuerySigValidatorOffChain.sol
index 869669b..4837af2 100644
--- a/contracts/validators/QuerySigValidatorOffChain.sol
+++ b/contracts/validators/QuerySigValidatorOffChain.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.16;
 
 import "./QueryValidatorOffChain.sol";
diff --git a/contracts/validators/QueryValidatorOffChain.sol b/contracts/validators/QueryValidatorOffChain.sol
index 07e47b1..1988799 100644
--- a/contracts/validators/QueryValidatorOffChain.sol
+++ b/contracts/validators/QueryValidatorOffChain.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.16;
 
 import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";