diff --git a/CHANGELOG.md b/CHANGELOG.md
index 940ca193a7..9bb287caa8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 Changes:
 
+- Align `grandpa_proveFinality` with Substrate
 - Kusama 9160 upgrade block
 
 
diff --git a/packages/types/src/interfaces/grandpa/definitions.ts b/packages/types/src/interfaces/grandpa/definitions.ts
index 970f22a59e..e41d6956ad 100644
--- a/packages/types/src/interfaces/grandpa/definitions.ts
+++ b/packages/types/src/interfaces/grandpa/definitions.ts
@@ -9,20 +9,11 @@ import type { Definitions } from '../../types';
 export default {
   rpc: {
     proveFinality: {
-      description: 'Prove finality for the range (begin; end] hash.',
+      description: 'Prove finality for the given block number, returning the Justification for the last block in the set.',
       params: [
         {
-          name: 'begin',
-          type: 'BlockHash'
-        },
-        {
-          name: 'end',
-          type: 'BlockHash'
-        },
-        {
-          name: 'authoritiesSetId',
-          type: 'u64',
-          isOptional: true
+          name: 'blockNumber',
+          type: 'BlockNumber'
         }
       ],
       type: 'Option<EncodedFinalityProofs>'