diff --git a/CHANGES.md b/CHANGES.md
index b54ebc18..483f58f0 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -16,6 +16,8 @@ There are likely to be descriptions etc outside of the list below, but new query
 | [#448](https://github.com/ethereum/beacon-APIs/pull/448) `GET /eth/v2/beacon/pool/attester_slashings` added         |                                                  |                                                  |                                                    |                                                 |                                           |
 | [#448](https://github.com/ethereum/beacon-APIs/pull/448) `POST /eth/v2/beacon/pool/attester_slashings` added        |                                                  |                                                  |                                                    |                                                 |                                           |
 | [#456](https://github.com/ethereum/beacon-APIs/pull/456) `POST /eth/v2/validator/aggregate_and_proofs` added        |                                                  |                                                  |                                                    |                                                 |                                           |
+| [#461](https://github.com/ethereum/beacon-APIs/pull/461) `attestation_versioned EVENT` added        |                                                  |                                                  |                                                    |                                                 |                                           |
+| [#461](https://github.com/ethereum/beacon-APIs/pull/461) `attester_slashing_versioned EVENT` added        |                                                  |                                                  |                                                    |                                                 |                                           |
 
 
 The Following are no longer in the Standard API, removed since the latest version.
diff --git a/apis/eventstream/index.yaml b/apis/eventstream/index.yaml
index 4116ce6f..b3c78bed 100644
--- a/apis/eventstream/index.yaml
+++ b/apis/eventstream/index.yaml
@@ -26,10 +26,12 @@ get:
             - block
             - block_gossip
             - attestation
+            - attestation_versioned
             - voluntary_exit
             - bls_to_execution_change
             - proposer_slashing
             - attester_slashing
+            - attester_slashing_versioned
             - finalized_checkpoint
             - chain_reorg
             - contribution_and_proof
@@ -62,10 +64,18 @@ get:
                 event: block_gossip
                 data: {"slot":"10", "block":"0x9a2fefd2fdb57f74993c7780ea5b9030d2897b615b89f808011ca5aebed54eaf"}
             attestation:
-              description: The node has received an Attestation (from P2P or API) that passes validation rules of the `beacon_attestation_{subnet_id}` topic
+              description: |
+                The node has received an Attestation (from P2P or API) that passes validation rules of the `beacon_attestation_{subnet_id}` topic
+
+                **deprecated:** only supports phase0 Attestation, use `attestation_versioned` event post-electra
               value: |
                 event: attestation
                 data: {"aggregation_bits":"0x01", "signature":"0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505", "data":{"slot":"1", "index":"1", "beacon_block_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2", "source":{"epoch":"1", "root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"}, "target":{"epoch":"1", "root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"}}}
+            attestation_versioned:
+              description: The node has received an Attestation (from P2P or API) that passes validation rules of the `beacon_attestation_{subnet_id}` topic
+              value: |
+                event: attestation_versioned
+                data: {"version": "electra", "data": {"aggregation_bits": "0x01", "data": {"slot": "1", "index": "1", "beacon_block_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2", "source": {"epoch": "1", "root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"}, "target": {"epoch": "1", "root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"}}, "signature": "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505", "committee_bits": "0x0000000000000001"}}
             voluntary_exit:
               description: The node has received a SignedVoluntaryExit (from P2P or API) that passes validation rules of `voluntary_exit` topic
               value: |
@@ -77,10 +87,18 @@ get:
                 event: proposer_slashing
                 data: {"signed_header_1":{"message":{"slot":"0","proposer_index":"0","parent_root":"0x0000000000000000000000000000000000000000000000000000000000000000","state_root":"0x0000000000000000000000000000000000000000000000000000000000000000","body_root":"0x0000000000000000000000000000000000000000000000000000000000000000"},"signature":"0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"},"signed_header_2":{"message":{"slot":"0","proposer_index":"0","parent_root":"0x0000000000000000000000000000000000000000000000000000000000000000","state_root":"0x0000000000000000000000000000000000000000000000000000000000000000","body_root":"0x0000000000000000000000000000000000000000000000000000000000000000"},"signature":"0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"}}
             attester_slashing:
-              description: The node has received an AttesterSlashing (from P2P or API) that passes validation rules of the `attester_slashing` topic
+              description: |
+                The node has received an AttesterSlashing (from P2P or API) that passes validation rules of the `attester_slashing` topic
+
+                **deprecated:** only supports phase0 AttesterSlashing, use `attester_slashing_versioned` event post-electra
               value: |
                 event: attester_slashing
                 data: {"attestation_1":{"attesting_indices":["0", "1"],"data":{"slot":"0","index":"0","beacon_block_root":"0x0000000000000000000000000000000000000000000000000000000000000000","source":{"epoch":"0","root":"0x0000000000000000000000000000000000000000000000000000000000000000"},"target":{"epoch":"0","root":"0x0000000000000000000000000000000000000000000000000000000000000000"}},"signature":"0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"},"attestation_2":{"attesting_indices":["0", "1"],"data":{"slot":"0","index":"0","beacon_block_root":"0x0000000000000000000000000000000000000000000000000000000000000000","source":{"epoch":"0","root":"0x0000000000000000000000000000000000000000000000000000000000000000"},"target":{"epoch":"0","root":"0x0000000000000000000000000000000000000000000000000000000000000000"}},"signature":"0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"}}
+            attester_slashing_versioned:
+              description: The node has received an AttesterSlashing (from P2P or API) that passes validation rules of the `attester_slashing` topic
+              value: |
+                event: attester_slashing_versioned
+                data: {"version": "electra", "data": {"attestation_1": {"attesting_indices": ["1"], "data": {"slot": "1", "index": "1", "beacon_block_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2", "source": {"epoch": "1", "root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"}, "target": {"epoch": "1", "root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"}}, "signature": "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"}, "attestation_2": {"attesting_indices": ["1"], "data": {"slot": "1", "index": "1", "beacon_block_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2", "source": {"epoch": "1", "root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"}, "target": {"epoch": "1", "root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"}}, "signature": "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"}}}
             bls_to_execution_change:
               description: The node has received a SignedBLSToExecutionChange (from P2P or API) that passes validation rules of the `bls_to_execution_change` topic
               value: |
@@ -156,5 +174,4 @@ get:
             code: 400
             message: "Invalid topic: weather_forecast"
     "500":
-      $ref: '../../beacon-node-oapi.yaml#/components/responses/InternalError'
-      
+      $ref: "../../beacon-node-oapi.yaml#/components/responses/InternalError"