diff --git a/scripts/node_version.py b/scripts/node_version.py
index edc04c13..2fca0370 100644
--- a/scripts/node_version.py
+++ b/scripts/node_version.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import json
 from pathlib import Path
 
@@ -11,9 +13,6 @@ CI_YML = ROOT / ".github" / "workflows" / "ci.yml"
 
 def main() -> None:
     new_version = get_version_from_dockerfile()
-    if new_version is None:
-        raise RuntimeError(f"No version found in {DOCKERFILE}")
-
     old_version = get_version_from_package_json()
     if old_version != new_version:
         update_package_json_version(old_version, new_version)
@@ -21,7 +20,7 @@ def main() -> None:
         update_production_node_version(old_version, new_version)
 
 
-def get_version_from_dockerfile() -> str | None:
+def get_version_from_dockerfile() -> str:
     # Extract version out of base image name:
     # FROM docker.io/node:22.13-bookworm-slim
     # -> 22.13
@@ -31,6 +30,7 @@ def get_version_from_dockerfile() -> str | None:
                 _, _, docker_tag = line.partition(":")
                 version_str, _, _ = docker_tag.partition("-")
                 return version_str
+    raise RuntimeError("Could not find version in Dockerfile")
 
 
 def get_version_from_package_json() -> str:
diff --git a/scripts/ruff_version.py b/scripts/ruff_version.py
index acc6beb1..4b0ab965 100644
--- a/scripts/ruff_version.py
+++ b/scripts/ruff_version.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import subprocess
 import tomllib
 from pathlib import Path
@@ -9,7 +11,7 @@ PRE_COMMIT_CONFIG = TEMPLATED_ROOT / ".pre-commit-config.yaml"
 PYPROJECT_TOML = ROOT / "pyproject.toml"
 
 
-def main():
+def main() -> None:
     new_version = get_requirements_txt_version()
     old_version = get_pyproject_toml_version()
     if old_version == new_version:
@@ -19,22 +21,23 @@ def main():
     subprocess.run(["uv", "lock", "--no-upgrade"], cwd=ROOT)
 
 
-def get_requirements_txt_version():
+def get_requirements_txt_version() -> str:
     content = REQUIREMENTS_LOCAL_TXT.read_text()
     for line in content.split("\n"):
         if line.startswith("ruff"):
             return line.split(" ")[0].split("==")[1]
-    return None
+    raise RuntimeError("Could not find ruff version in requirements/local.txt")
 
 
-def get_pyproject_toml_version():
+def get_pyproject_toml_version() -> str:
     data = tomllib.loads(PYPROJECT_TOML.read_text())
     for dependency in data["project"]["dependencies"]:
         if dependency.startswith("ruff=="):
             return dependency.split("==")[1]
+    raise RuntimeError("Could not find ruff version in pyproject.toml")
 
 
-def update_ruff_version(old_version, new_version):
+def update_ruff_version(old_version: str, new_version: str) -> None:
     # Update pyproject.toml
     new_content = PYPROJECT_TOML.read_text().replace(
         f"ruff=={old_version}",