diff --git a/Makefile b/Makefile
index c3b1bc48..7395bc60 100644
--- a/Makefile
+++ b/Makefile
@@ -70,11 +70,11 @@ clean:
 
 .PHONY: isort
 isort:
-	$(py) isort aiogram tests
+	$(py) isort aiogram tests scripts
 
 .PHONY: black
 black:
-	$(py) black aiogram tests
+	$(py) black aiogram tests scripts
 
 .PHONY: flake8
 flake8:
diff --git a/aiogram/__init__.py b/aiogram/__init__.py
index 0d751e51..f83bb4cb 100644
--- a/aiogram/__init__.py
+++ b/aiogram/__init__.py
@@ -27,5 +27,5 @@ __all__ = (
     "handler",
 )
 
-__version__ = "3.0.0a6"
-__api_version__ = "5.0"
+__version__ = "3.0.0-alpha.6"
+__api_version__ = "4.9"
diff --git a/docs/_package_version.md b/docs/_package_version.md
index 78e56ffb..d8cad509 100644
--- a/docs/_package_version.md
+++ b/docs/_package_version.md
@@ -1 +1 @@
-3.0.0a5
+3.0.0a6
diff --git a/poetry.lock b/poetry.lock
index 5f99360c..d91a7a5f 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1322,7 +1322,7 @@ proxy = ["aiohttp-socks"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "04fb2562ab4dccbd2b7125670b37a3124c7eeab55dbec4d1e05a7a8d10f97175"
+content-hash = "ee4cbf4fb0a62ec777bec179dad21e7cea1ced466ab2a5424f54f8764f2955d3"
 
 [metadata.files]
 aiofiles = [
diff --git a/pyproject.toml b/pyproject.toml
index 7dfa0d1b..a27f8059 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -84,6 +84,7 @@ furo = "^2020.11.15-beta.17"
 sphinx-prompt = "^1.3.0"
 Sphinx-Substitution-Extensions = "^2020.9.30"
 black = "^20.8b1"
+toml = "^0.10.2"
 
 [tool.poetry.extras]
 fast = ["uvloop"]
diff --git a/scripts/bump_versions.py b/scripts/bump_versions.py
index 609845a7..9ed20b68 100644
--- a/scripts/bump_versions.py
+++ b/scripts/bump_versions.py
@@ -1,18 +1,33 @@
 import re
 from pathlib import Path
 
-from poetry.factory import Factory
-from poetry.masonry.metadata import Metadata
+import toml
 
 BASE_PATTERN = r'({variable} = ")[a-z0-9.+]+(")'
 PACKAGE_VERSION = re.compile(BASE_PATTERN.format(variable="__version__"))
 API_VERSION = re.compile(BASE_PATTERN.format(variable="__api_version__"))
 
+STAGE_MAPPING = {
+    "alpha": "a",
+    "beta": "b",
+}
+
 
 def get_package_version() -> str:
-    poetry_instance = Factory().create_poetry(Path.cwd())
-    meta: Metadata = Metadata.from_package(poetry_instance.package)
-    return meta.version
+    data = toml.load(Path("pyproject.toml").absolute())
+    raw_version: str = data["tool"]["poetry"]["version"]
+    if "-" not in raw_version:
+        return raw_version
+
+    version, stage_build = raw_version.split("-", maxsplit=1)
+    if stage_build:
+        stage, build = stage_build.split(".")
+        if stage_str := STAGE_MAPPING.get(stage):
+            version += f"{stage_str}{build}"
+        else:
+            return raw_version
+
+    return version
 
 
 def get_telegram_api_version() -> str: