diff --git a/src/BlockBuilderPolicy.sol b/src/BlockBuilderPolicy.sol
index d8c5226..a82022f 100644
--- a/src/BlockBuilderPolicy.sol
+++ b/src/BlockBuilderPolicy.sol
@@ -89,6 +89,7 @@ contract BlockBuilderPolicy is
     /// @inheritdoc IBlockBuilderPolicy
     function initialize(address _initialOwner, address _registry) external override initializer {
         __Ownable_init(_initialOwner);
+        __UUPSUpgradeable_init();
         __EIP712_init("BlockBuilderPolicy", "1");
         require(_registry != address(0), InvalidRegistry());
 
diff --git a/src/FlashtestationRegistry.sol b/src/FlashtestationRegistry.sol
index 647a832..36d3635 100644
--- a/src/FlashtestationRegistry.sol
+++ b/src/FlashtestationRegistry.sol
@@ -66,6 +66,7 @@ contract FlashtestationRegistry is
         __Ownable_init(owner);
         __EIP712_init("FlashtestationRegistry", "1");
         __ReentrancyGuardTransient_init();
+        __UUPSUpgradeable_init();
         require(_attestationContract != address(0), InvalidAttestationContract());
         attestationContract = IAttestation(_attestationContract);
     }