diff --git a/CHANGELOG.md b/CHANGELOG.md
index 95999a9..ca307c7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 1.0.0rc6 /2025-01-28
+
+## What's Changed
+* Minor bug fix
+
 ## 1.0.0rc5 /2025-01-28
 
 ## What's Changed
diff --git a/async_substrate_interface/async_substrate.py b/async_substrate_interface/async_substrate.py
index 9c46a37..d442b98 100644
--- a/async_substrate_interface/async_substrate.py
+++ b/async_substrate_interface/async_substrate.py
@@ -699,7 +699,7 @@ def __init__(
         self.runtime_config = RuntimeConfigurationObject(
             ss58_format=self.ss58_format, implements_scale_info=True
         )
-        self.__metadata_cache = {}
+        self._metadata_cache = {}
         self._nonces = {}
         self.metadata_version_hex = "0x0f000000"  # v15
         self.reload_type_registry()
diff --git a/pyproject.toml b/pyproject.toml
index 3426976..3ccc4ef 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "async-substrate-interface"
-version = "1.0.0rc5"
+version = "1.0.0rc6"
 description = "Asyncio library for interacting with substrate. Mostly API-compatible with py-substrate-interface"
 readme = "README.md"
 license = { file = "LICENSE" }