diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab57f9b44f9..c16a9a31f9e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -144,6 +144,7 @@ Released with 1.0.0-beta.37 code base.
 - Add revert reason support to sendSignedTransaction
 - ENS module extended with the possibility to add a custom registry (#3301)
 - Missing ENS Registry methods and Resolver.supportsInterface method added (#3325)
+- Add optional gas type to AbiItem typescript definitions (for ABIs generated by Vyper)
 
 ### Changed
 
diff --git a/packages/web3-utils/types/index.d.ts b/packages/web3-utils/types/index.d.ts
index da2f261daa8..fad6c39db85 100644
--- a/packages/web3-utils/types/index.d.ts
+++ b/packages/web3-utils/types/index.d.ts
@@ -220,6 +220,7 @@ export interface AbiItem {
     payable?: boolean;
     stateMutability?: StateMutabilityType;
     type: AbiType;
+    gas?: number;
 }
 
 export interface AbiInput {
diff --git a/packages/web3-utils/types/tests/json-interface-method-to-string-test.ts b/packages/web3-utils/types/tests/json-interface-method-to-string-test.ts
index 649b6609c6a..7db99e00a1b 100644
--- a/packages/web3-utils/types/tests/json-interface-method-to-string-test.ts
+++ b/packages/web3-utils/types/tests/json-interface-method-to-string-test.ts
@@ -101,7 +101,8 @@ const abiItem: AbiItem = {
     ],
     payable: false,
     stateMutability: "pure",
-    type: "function"
+    type: "function",
+    gas: 175875
 };
 // $ExpectType string
 jsonInterfaceMethodToString(abiItem);
diff --git a/test/contract.encodeABI.js b/test/contract.encodeABI.js
index 5d5172c078d..754483d4d8e 100644
--- a/test/contract.encodeABI.js
+++ b/test/contract.encodeABI.js
@@ -28,7 +28,8 @@ var abi = [
         ],
         payable: false,
         type: "function",
-        stateMutability: "view"
+        stateMutability: "view",
+        gas: 175875
     }
 ];