diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4797dc4..4901703 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changelog
 
+## 1.0.0rc12 /2025-02-07
+* python 3.9 support by @roman-opentensor in https://github.com/opentensor/async-substrate-interface/pull/33
+
 ## 1.0.0rc11 /2025-02-06
 * Reuses the websocket for sync Substrate by @thewhaleking in https://github.com/opentensor/async-substrate-interface/pull/29
 * Feat/metadata v15 cache by @camfairchild in https://github.com/opentensor/async-substrate-interface/pull/30
diff --git a/async_substrate_interface/utils/decoding.py b/async_substrate_interface/utils/decoding.py
index 3162fe4..f0ce439 100644
--- a/async_substrate_interface/utils/decoding.py
+++ b/async_substrate_interface/utils/decoding.py
@@ -1,3 +1,5 @@
+from typing import Union
+
 from bt_decode import AxonInfo, PrometheusInfo
 
 
@@ -29,7 +31,7 @@ def _determine_if_old_runtime_call(runtime_call_def, metadata_v15_value) -> bool
     return False
 
 
-def _bt_decode_to_dict_or_list(obj) -> dict | list[dict]:
+def _bt_decode_to_dict_or_list(obj) -> Union[dict, list[dict]]:
     if isinstance(obj, list):
         return [_bt_decode_to_dict_or_list(item) for item in obj]
 
diff --git a/pyproject.toml b/pyproject.toml
index c6281f3..3cb5275 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "async-substrate-interface"
-version = "1.0.0rc11"
+version = "1.0.0rc12"
 description = "Asyncio library for interacting with substrate. Mostly API-compatible with py-substrate-interface"
 readme = "README.md"
 license = { file = "LICENSE" }