diff --git a/.woodpecker/build-amd64.yml b/.woodpecker/build-amd64.yml
index b3ce7c8..816daa1 100644
--- a/.woodpecker/build-amd64.yml
+++ b/.woodpecker/build-amd64.yml
@@ -7,7 +7,9 @@ steps:
     image: bash
     commands:
       - attic login lounge-rocks https://cache.lounge.rocks $ATTIC_KEY --set-default
-    secrets: [attic_key]
+    environment:
+      ATTIC_KEY:
+        from_secret: attic_key
 
   - name: build whisper_api
     image: bash
diff --git a/Dockerfile b/Dockerfile
index fa301e5..65a520d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,8 @@
 # newest version:
 # https://hub.docker.com/r/nvidia/cuda/tags?page=1&name=-base-ubuntu22.04&ordering=name
 
-ARG CUDA_VERSION=12.4.1
-FROM nvidia/cuda:${CUDA_VERSION}-base-ubuntu22.04
-
-ARG PYTHON_VERSION=3.10
+ARG CUDA_VERSION=12.6.2
+FROM nvidia/cuda:${CUDA_VERSION}-base-ubuntu24.04
 
 WORKDIR /workspace
 
@@ -12,14 +10,13 @@ RUN export DEBIAN_FRONTEND=noninteractive && \
     apt-get -qq update && \
     apt-get -qq install --no-install-recommends \
         ffmpeg \
-        python${PYTHON_VERSION} \
-        python${PYTHON_VERSION}-venv \
+        python3 \
+        python3-venv \
         python3-pip && \
-    rm -rf /var/lib/apt/lists/* && \
-    pip3 install --upgrade pip
+    rm -rf /var/lib/apt/lists/*
 
 COPY requirements.txt requirements.txt
-RUN pip3 install -r requirements.txt
+RUN pip3 install -r requirements.txt --break-system-packages
 
 # disabled by default since GitHub Actions do not have enough space
 ARG PREFETCH_MODEL=0
@@ -32,7 +29,7 @@ RUN if [ "$PREFETCH_MODEL" != 0 ]; then \
 COPY . /workspace/code
 
 RUN cd /workspace/code && \
-    pip3 install .
+    pip3 install . --break-system-packages
 
 ENV PORT=3001 \
     LISTEN=0.0.0.0 \
diff --git a/flake.lock b/flake.lock
index 873d3e5..59b740a 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1730200266,
-        "narHash": "sha256-l253w0XMT8nWHGXuXqyiIC/bMvh1VRszGXgdpQlfhvU=",
+        "lastModified": 1767892417,
+        "narHash": "sha256-dhhvQY67aboBk8b0/u0XB6vwHdgbROZT3fJAjyNh5Ww=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "807e9154dcb16384b1b765ebe9cd2bba2ac287fd",
+        "rev": "3497aa5c9457a9d88d71fa93a4a8368816fbeeba",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 072e060..ae371b1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,8 +33,8 @@
         (system: nixpkgsFor.${system}.nixpkgs-fmt);
 
       overlays.default = final: prev: {
-        devShell = final.callPackage nixos/devShell { inherit self; };
-        whisper_api = final.callPackage nixos/pkgs/whisper_api { inherit self; };
+        devShell = final.python3Packages.callPackage nixos/devShell { inherit self; };
+        whisper_api = final.python3Packages.callPackage nixos/pkgs/whisper_api { inherit self; };
         # Our code is not compatible with pydantic version 2 yet.
         python3 = prev.python3.override {
           packageOverrides = python-self: python-super: {
diff --git a/nixos/pkgs/whisper_api/default.nix b/nixos/pkgs/whisper_api/default.nix
index de2e887..ef1db10 100644
--- a/nixos/pkgs/whisper_api/default.nix
+++ b/nixos/pkgs/whisper_api/default.nix
@@ -1,9 +1,24 @@
-{ self
-, lib
-, python3
-,
+{
+  self,
+  lib,
+  buildPythonApplication,
+
+  # build-system
+  setuptools,
+  pythonRelaxDepsHook,
+
+  # dependencies
+  fastapi,
+  ffmpeg-python,
+  openai-whisper,
+  python-multipart,
+  uvicorn,
+
+  # tests
+  unittestCheckHook,
+  httpx,
 }:
-python3.pkgs.buildPythonApplication {
+buildPythonApplication {
 
   pname = "whisper_api";
 
@@ -18,12 +33,12 @@ python3.pkgs.buildPythonApplication {
 
   pythonRelaxDeps = [ ];
 
-  nativeBuildInputs = with python3.pkgs; [
+  nativeBuildInputs = [
     setuptools
     pythonRelaxDepsHook
   ];
 
-  propagatedBuildInputs = with python3.pkgs; [
+  propagatedBuildInputs = [
     fastapi
     ffmpeg-python
     openai-whisper
@@ -31,7 +46,7 @@ python3.pkgs.buildPythonApplication {
     uvicorn
   ];
 
-  nativeCheckInputs = with python3.pkgs; [
+  nativeCheckInputs = [
     unittestCheckHook
     httpx
   ];
diff --git a/pyproject.toml b/pyproject.toml
index 2717a79..7f6abd2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ name = "whisper_api"
 dynamic = ["dependencies", "version"]
 description = "A simple API for whisper"
 readme = "README.md"
-requires-python = ">=3.10"
+requires-python = "~=3.12"
 license = { text = "" }
 authors = [
     { name = "MayNiklas", email = "info@niklas-steffen.de" },
diff --git a/requirements.txt b/requirements.txt
index 139d147..822f1e5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
-fastapi==0.112.0
+fastapi==0.121.1
 ffmpeg-python==0.2.0
-openai-whisper==20240930
-pydantic==2.8.2
-python-multipart==0.0.9
-uvicorn==0.29.0
+openai-whisper==20250625
+pydantic==2.12.4
+python-multipart==0.0.20
+uvicorn==0.38.0
diff --git a/src/whisper_api/__init__.py b/src/whisper_api/__init__.py
index ee2b9cd..a3ff0f1 100644
--- a/src/whisper_api/__init__.py
+++ b/src/whisper_api/__init__.py
@@ -1,3 +1,4 @@
+import multiprocessing
 import os
 import sys
 
@@ -6,10 +7,19 @@
     path = os.path.realpath(os.path.abspath(__file__))
     sys.path.insert(0, os.path.dirname(os.path.dirname(path)))
 
-__version__ = "20241105"
+__version__ = "20251214"
 
-from whisper_api.main import app  # isort: skip
-from whisper_api.main import start
+
+from whisper_api.main import am_i_main_process
+def start():
+    """Mock Version of start() that is overwritten in the main process by the import below."""
+    name = multiprocessing.current_process().name
+    raise ImportError(f"You're trying to run start() from another process than Main "
+                      f"(you are: '{name}'). This is currently not supported.")
+
+if am_i_main_process():
+    from whisper_api.main import app  # isort: skip
+    from whisper_api.main import start
 
 if __name__ == "__main__":
     start()
diff --git a/src/whisper_api/main.py b/src/whisper_api/main.py
index a44a72b..2df6bf6 100644
--- a/src/whisper_api/main.py
+++ b/src/whisper_api/main.py
@@ -47,20 +47,25 @@
 from whisper_api.log_setup import logger
 from whisper_api.log_setup import uuid_log_format
 
-IS_MAIN_PROCESS = multiprocessing.current_process().name == "MainProcess"
+
+def am_i_process(name: str) -> bool:
+    return multiprocessing.current_process().name == name
+
+def am_i_main_process() -> bool:
+    return am_i_process("MainProcess")
 
 description = """
 Whisper API transcribes audio files.
 """
 
-if IS_MAIN_PROCESS:
+if am_i_main_process():
     print(description)
 
 
 """
 init global variables
 """
-if IS_MAIN_PROCESS:
+if am_i_main_process():
     # TODO: can tasks get GCed before they finish if queue is too long?
     task_dict: TempDict[uuid_hex_t, Task] = TempDict(
         expiration_time_m=DELETE_RESULTS_AFTER_M,
@@ -284,7 +289,7 @@ async def lifespan(_app: FastAPI):
 """
 Init API
 """
-if IS_MAIN_PROCESS:
+if am_i_main_process():
     app = FastAPI(
         title="Whisper API",
         description=description,
@@ -346,18 +351,19 @@ async def log_requests(req: Request, call_next):
         return resp
 
 
-"""
-Hook for uvicorn
-"""
+    """
+    Hook for uvicorn
+    """
 
 
-def start():
-    import uvicorn
+    def start():
+        """Entrypoint to start the API (note: this version is only imported on the MainProcess (see __init.py__)"""
+        import uvicorn
 
-    # TODO:
-    # forwarded_allow_ips= should be set via env var
-    # proxy_headers=True only when needed
-    uvicorn.run(app, host=API_LISTEN, port=API_PORT, proxy_headers=True, forwarded_allow_ips="*", log_level="warning")
+        # TODO:
+        # forwarded_allow_ips= should be set via env var
+        # proxy_headers=True only when needed
+        uvicorn.run(app, host=API_LISTEN, port=API_PORT, proxy_headers=True, forwarded_allow_ips="*", log_level="warning")
 
 
 if __name__ == "__main__":
diff --git a/test/test_import.py b/test/test_import.py
index 036e367..2bad8cb 100644
--- a/test/test_import.py
+++ b/test/test_import.py
@@ -9,4 +9,29 @@ def test_import_whisper_api(self):
 
             assert whisper_api
         except ImportError:
-            unittest.fail("Failed to import whisper_api")
+            unittest.fail("Failed to 'import whisper_api'")
+
+    def test_from_import_app(self):
+        try:
+            from whisper_api import app
+
+            assert app
+
+        except ImportError:
+            unittest.fail("Failed to 'from whisper_api import app'")
+
+
+    def test_from_import_start(self):
+        try:
+            from whisper_api import start
+
+            assert start
+
+            assert "Mock Version" not in start.__doc__
+
+        except ImportError:
+            unittest.fail("Failed to 'from whisper_api import real implementation of start()' on main process")
+
+
+
+    # TODO: write a test that attempt to import from a a mp.Process and assert that app does not exist
\ No newline at end of file