diff --git a/setup.cfg b/setup.cfg
index d86fe49f6d..f6ca779de2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -20,7 +20,7 @@ classifiers =
     Programming Language :: Python
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Operating System :: POSIX
     Operating System :: MacOS :: MacOS X
     Environment :: Console
@@ -41,11 +41,11 @@ zip_safe = False
 package_dir =
     = src
 packages = find_namespace:
-python_requires = >=3.8
+python_requires = >=3.9
 setup_requires =
-    setuptools>=46.0.0
+    setuptools>=58.0.0
 install_requires =
-    backend.ai-client~=20.9.0
+    backend.ai-client~=21.9.0
 
 [options.packages.find]
 where = src
@@ -53,20 +53,20 @@ include = ai.backend.meta
 
 [options.extras_require]
 manager =
-    backend.ai-manager~=21.9.0.dev0
+    backend.ai-manager~=21.9.0
 agent =
-    backend.ai-agent~=21.9.0.dev0
+    backend.ai-agent~=21.9.0
 build =
-    wheel>=0.34.2
-    twine>=3.2.0
-    setuptools>=49.0.0
+    wheel>=0.37.0
+    twine>=3.5.0
+    setuptools>=58.5.3
 dev =
 test =
-    pytest~=6.1.2
+    pytest>=6.2.5
 lint =
-    flake8>=3.8.4
+    flake8>=4.0.1
 typecheck =
-    mypy>=0.790
+    mypy>=0.910
 docs =
     sphinx~=3.3
     sphinx-rtd-theme>=0.5.0
diff --git a/src/ai/backend/meta/__init__.py b/src/ai/backend/meta/__init__.py
index 6429bda073..7fa94275e2 100644
--- a/src/ai/backend/meta/__init__.py
+++ b/src/ai/backend/meta/__init__.py
@@ -2,4 +2,4 @@
 This is a meta-package which contains nothing yet.
 """
 
-__version__ = '21.09.0.dev0'
+__version__ = '21.09.0'