diff --git a/contracts/AuraBribesProcessor.sol b/contracts/AuraBribesProcessor.sol
index 77b6fd2..0770fe3 100644
--- a/contracts/AuraBribesProcessor.sol
+++ b/contracts/AuraBribesProcessor.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 pragma solidity 0.8.10;
 
 
diff --git a/contracts/CowSwapSeller.sol b/contracts/CowSwapSeller.sol
index bc62107..c227db8 100644
--- a/contracts/CowSwapSeller.sol
+++ b/contracts/CowSwapSeller.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 pragma solidity 0.8.10;
 
 
diff --git a/contracts/OnChainPricingMainnet.sol b/contracts/OnChainPricingMainnet.sol
index 3ca7a72..bbbbf40 100644
--- a/contracts/OnChainPricingMainnet.sol
+++ b/contracts/OnChainPricingMainnet.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 pragma solidity 0.8.10;
 
 
diff --git a/contracts/OnChainPricingMainnetLenient.sol b/contracts/OnChainPricingMainnetLenient.sol
index 4ac27dd..4a49328 100644
--- a/contracts/OnChainPricingMainnetLenient.sol
+++ b/contracts/OnChainPricingMainnetLenient.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 pragma solidity 0.8.10;
 
 
diff --git a/contracts/OnChainSwapMainnet.sol b/contracts/OnChainSwapMainnet.sol
index 2a25112..91b64b0 100644
--- a/contracts/OnChainSwapMainnet.sol
+++ b/contracts/OnChainSwapMainnet.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 pragma solidity 0.8.10;
 
 import {IERC20} from "@oz/token/ERC20/IERC20.sol";
diff --git a/contracts/VotiumBribesProcessor.sol b/contracts/VotiumBribesProcessor.sol
index d78f78a..2d8b8cb 100644
--- a/contracts/VotiumBribesProcessor.sol
+++ b/contracts/VotiumBribesProcessor.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 pragma solidity 0.8.10;
 
 
diff --git a/contracts/archive/BasicOnChainPricingMainnetLenient.sol b/contracts/archive/BasicOnChainPricingMainnetLenient.sol
index 634ee85..f9f3a4c 100644
--- a/contracts/archive/BasicOnChainPricingMainnetLenient.sol
+++ b/contracts/archive/BasicOnChainPricingMainnetLenient.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 pragma solidity 0.8.10;
 
 
diff --git a/contracts/archive/FullOnChainPricingMainnet.sol b/contracts/archive/FullOnChainPricingMainnet.sol
index f3fa975..a9a8ebe 100644
--- a/contracts/archive/FullOnChainPricingMainnet.sol
+++ b/contracts/archive/FullOnChainPricingMainnet.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 pragma solidity 0.8.10;
 
 
diff --git a/contracts/demo/CowSwapDemoSeller.sol b/contracts/demo/CowSwapDemoSeller.sol
index ae4e596..5920c3c 100644
--- a/contracts/demo/CowSwapDemoSeller.sol
+++ b/contracts/demo/CowSwapDemoSeller.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 pragma solidity 0.8.10;
 
 
diff --git a/contracts/demo/TestProcessor.sol b/contracts/demo/TestProcessor.sol
index fb37564..0f4cfdb 100644
--- a/contracts/demo/TestProcessor.sol
+++ b/contracts/demo/TestProcessor.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 pragma solidity 0.8.10;
 
 
diff --git a/contracts/demo/UselessPricer.sol b/contracts/demo/UselessPricer.sol
index de6a265..dd08c45 100644
--- a/contracts/demo/UselessPricer.sol
+++ b/contracts/demo/UselessPricer.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 pragma solidity 0.8.10;
 
 /// @title OnChainPricing
diff --git a/interfaces/balancer/WeightedPoolUserData.sol b/interfaces/balancer/WeightedPoolUserData.sol
index c0d967c..bcb2b47 100644
--- a/interfaces/balancer/WeightedPoolUserData.sol
+++ b/interfaces/balancer/WeightedPoolUserData.sol
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-2.0
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or