diff --git a/CHANGELOG.mdx b/CHANGELOG.mdx
index 83b55dfbb..add7dc1f6 100644
--- a/CHANGELOG.mdx
+++ b/CHANGELOG.mdx
@@ -17,6 +17,16 @@ https://github.com/RasaHQ/rasa/tree/main/changelog/ . -->
 
 <!-- TOWNCRIER -->
 
+## [3.9.1] - 2024-08-15
+                       
+Rasa_Sdk 3.9.1 (2024-08-15)                            
+### Bugfixes
+- [#1129](https://github.com/rasahq/rasa-sdk/issues/1129): Fixed health check for the case when the action service is run in gRPC mode.
+
+### Miscellaneous internal changes
+- [#1123](https://github.com/rasahq/rasa-sdk/issues/1123), [#1130](https://github.com/rasahq/rasa-sdk/issues/1130)
+
+
 ## [3.9.0] - 2024-07-03
                        
 Rasa_Sdk 3.9.0 (2024-07-03)                            
diff --git a/changelog/1123.misc.md b/changelog/1123.misc.md
deleted file mode 100644
index 8ad9b5840..000000000
--- a/changelog/1123.misc.md
+++ /dev/null
@@ -1 +0,0 @@
-Add support for ARM architecture in the `rasa-sdk` Docker image build.
diff --git a/changelog/1129.bugfix.md b/changelog/1129.bugfix.md
deleted file mode 100644
index 5505d32f3..000000000
--- a/changelog/1129.bugfix.md
+++ /dev/null
@@ -1 +0,0 @@
-Fixed health check for the case when the action service is run in gRPC mode.
\ No newline at end of file
diff --git a/changelog/1130.misc.md b/changelog/1130.misc.md
deleted file mode 100644
index c759bc6d2..000000000
--- a/changelog/1130.misc.md
+++ /dev/null
@@ -1,2 +0,0 @@
-Update ruff to 0.3.7.
-Switch to ruff as code formatter.
diff --git a/pyproject.toml b/pyproject.toml
index fa8bf036a..42f646488 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "rasa-sdk"
-version = "3.9.0"
+version = "3.9.1"
 description = "Open source machine learning framework to automate text- and voice-based conversations: NLU, dialogue management, connect to Slack, Facebook, and more - Create chatbots and voice assistants"
 authors = [ "Rasa Technologies GmbH <hi@rasa.com>",]
 maintainers = [ "Tom Bocklisch <tom@rasa.com>",]
@@ -67,11 +67,7 @@ exclude = "rasa_sdk/grpc_py"
 [tool.ruff]
 line-length = 88
 target-version = "py38"
-exclude = [ "rasa_sdk/grpc_py", "eggs", ".git", ".pytest_cache", "build", "dist", ".DS_Store"]
-
-[tool.ruff.lint]
-ignore = [ "D100", "D101", "D102", "D103", "D104", "D105", "RUF005",]
-select = [ "D", "E", "F", "W", "RUF",]
+exclude = [ "rasa_sdk/grpc_py", "eggs", ".git", ".pytest_cache", "build", "dist", ".DS_Store",]
 
 [tool.poetry.dependencies]
 python = ">=3.8,<3.11"
@@ -106,13 +102,17 @@ semantic_version = "^2.8.5"
 mypy = "^1.5"
 sanic-testing = "^22.12"
 
-[tool.ruff.lint.pydocstyle]
-convention = "google"
+[tool.ruff.lint]
+ignore = [ "D100", "D101", "D102", "D103", "D104", "D105", "RUF005",]
+select = [ "D", "E", "F", "W", "RUF",]
 
 [tool.pytest.ini_options]
 python_functions = "test_"
 asyncio_mode = "auto"
 
+[tool.ruff.lint.pydocstyle]
+convention = "google"
+
 [tool.poetry.group.dev.dependencies]
 ruff = ">=0.3.5,<0.4.0"
 pytest-asyncio = "^0.21.0"
diff --git a/rasa_sdk/version.py b/rasa_sdk/version.py
index 4085959ad..cb161a1ac 100644
--- a/rasa_sdk/version.py
+++ b/rasa_sdk/version.py
@@ -1,3 +1,3 @@
 # this file will automatically be changed,
 # do not add anything but the version number here!
-__version__ = "3.9.0"
+__version__ = "3.9.1"