diff --git a/contracts/erc1155/contracts/src/ERC1155.sol b/contracts/erc1155/contracts/src/ERC1155.sol
index db9e2697b3..388634562b 100644
--- a/contracts/erc1155/contracts/src/ERC1155.sol
+++ b/contracts/erc1155/contracts/src/ERC1155.sol
@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 import "@0x/contracts-utils/contracts/src/SafeMath.sol";
 import "@0x/contracts-utils/contracts/src/Address.sol";
diff --git a/contracts/erc1155/contracts/src/ERC1155Mintable.sol b/contracts/erc1155/contracts/src/ERC1155Mintable.sol
index 9269e4b597..021f46095d 100644
--- a/contracts/erc1155/contracts/src/ERC1155Mintable.sol
+++ b/contracts/erc1155/contracts/src/ERC1155Mintable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 import "@0x/contracts-utils/contracts/src/SafeMath.sol";
 import "./ERC1155.sol";
diff --git a/contracts/erc1155/contracts/src/MixinNonFungibleToken.sol b/contracts/erc1155/contracts/src/MixinNonFungibleToken.sol
index 5badef66bf..75e2cfc2c3 100644
--- a/contracts/erc1155/contracts/src/MixinNonFungibleToken.sol
+++ b/contracts/erc1155/contracts/src/MixinNonFungibleToken.sol
@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 import "./mixins/MNonFungibleToken.sol";
 
diff --git a/contracts/erc1155/contracts/src/interfaces/IERC1155.sol b/contracts/erc1155/contracts/src/interfaces/IERC1155.sol
index d0c7a16621..c511cc1ecb 100644
--- a/contracts/erc1155/contracts/src/interfaces/IERC1155.sol
+++ b/contracts/erc1155/contracts/src/interfaces/IERC1155.sol
@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 
 /// @title ERC-1155 Multi Token Standard
diff --git a/contracts/erc1155/contracts/src/interfaces/IERC1155Mintable.sol b/contracts/erc1155/contracts/src/interfaces/IERC1155Mintable.sol
index 0e4c65a682..b8ca0a6626 100644
--- a/contracts/erc1155/contracts/src/interfaces/IERC1155Mintable.sol
+++ b/contracts/erc1155/contracts/src/interfaces/IERC1155Mintable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 import "./IERC1155.sol";
 
diff --git a/contracts/erc1155/contracts/src/interfaces/IERC1155Receiver.sol b/contracts/erc1155/contracts/src/interfaces/IERC1155Receiver.sol
index 2d164afc65..7ab45c2b63 100644
--- a/contracts/erc1155/contracts/src/interfaces/IERC1155Receiver.sol
+++ b/contracts/erc1155/contracts/src/interfaces/IERC1155Receiver.sol
@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 
 interface IERC1155Receiver {
diff --git a/contracts/erc1155/contracts/src/mixins/MNonFungibleToken.sol b/contracts/erc1155/contracts/src/mixins/MNonFungibleToken.sol
index 26f403061d..71a9a3f74d 100644
--- a/contracts/erc1155/contracts/src/mixins/MNonFungibleToken.sol
+++ b/contracts/erc1155/contracts/src/mixins/MNonFungibleToken.sol
@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 
 contract MNonFungibleToken {
diff --git a/contracts/erc1155/contracts/test/DummyERC1155Receiver.sol b/contracts/erc1155/contracts/test/DummyERC1155Receiver.sol
index c27f923f47..28010c6403 100644
--- a/contracts/erc1155/contracts/test/DummyERC1155Receiver.sol
+++ b/contracts/erc1155/contracts/test/DummyERC1155Receiver.sol
@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 import "../src/interfaces/IERC1155Receiver.sol";
 
diff --git a/contracts/utils/contracts/src/Address.sol b/contracts/utils/contracts/src/Address.sol
index 92b5295e64..596026974c 100644
--- a/contracts/utils/contracts/src/Address.sol
+++ b/contracts/utils/contracts/src/Address.sol
@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 
 /**