diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d4a6439b..8db49ca3 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -8,7 +8,7 @@ Example:
 ```bash
 $ python3 -m venv venv
 $ source venv/bin/activate
-$ pip install -r requirements.txt
+$ pip install -r requirements_dev.txt
 ```
 
 
diff --git a/flux_local/command.py b/flux_local/command.py
index 15652014..7084fbdc 100644
--- a/flux_local/command.py
+++ b/flux_local/command.py
@@ -109,7 +109,9 @@ async def _run_piped_with_sem(cmds: Sequence[Task]) -> str:
         try:
             out = await asyncio.wait_for(cmd.run(stdin), _TIMEOUT)
         except asyncio.exceptions.TimeoutError as err:
-            raise cmd.exc(f"Command '{cmd}' timed out") from err
+            if isinstance(cmd, Command):
+                raise cmd.exc(f"Command '{cmd}' timed out") from err
+            raise err
         stdin = out
     return out.decode("utf-8") if out else ""
 
diff --git a/flux_local/git_repo.py b/flux_local/git_repo.py
index 434fc089..a3a70784 100644
--- a/flux_local/git_repo.py
+++ b/flux_local/git_repo.py
@@ -633,7 +633,9 @@ async def build_kustomization(
         ]
 
 
-def _ready_kustomizations(kustomizations: list[Kustomization], visited: set[str]) -> tuple[Kustomization, Kustomization]:
+def _ready_kustomizations(
+    kustomizations: list[Kustomization], visited: set[str]
+) -> tuple[list[Kustomization], list[Kustomization]]:
     """Split the kustomizations into those that are ready vs pending."""
     ready = []
     pending = []
@@ -690,7 +692,11 @@ async def update_kustomization(cluster: Cluster) -> None:
                 build_tasks = []
                 (ready, pending) = _ready_kustomizations(queue, visited)
                 for kustomization in ready:
-                    _LOGGER.debug("Processing kustomization '%s': %s", kustomization.name, kustomization.path)
+                    _LOGGER.debug(
+                        "Processing kustomization '%s': %s",
+                        kustomization.name,
+                        kustomization.path,
+                    )
 
                     if kustomization.postbuild_substitute_from:
                         values.expand_postbuild_substitute_reference(
@@ -772,7 +778,9 @@ async def update_kustomization(cluster: Cluster) -> None:
 
 
 @contextlib.contextmanager
-def create_worktree(repo: git.repo.Repo, existing_branch: str | None = None) -> Generator[Path, None, None]:
+def create_worktree(
+    repo: git.repo.Repo, existing_branch: str | None = None
+) -> Generator[Path, None, None]:
     """Create a ContextManager for a new git worktree in the current repo.
 
     This is used to get a fork of the current repo without any local changes
diff --git a/flux_local/helm.py b/flux_local/helm.py
index 80b00e06..180d1dca 100644
--- a/flux_local/helm.py
+++ b/flux_local/helm.py
@@ -50,7 +50,7 @@
     SECRET_KIND,
     REPO_TYPE_OCI,
     HELM_REPOSITORY,
-    GIT_REPOSITORY
+    GIT_REPOSITORY,
 )
 from .exceptions import HelmException
 
@@ -68,7 +68,7 @@
 def _chart_name(release: HelmRelease, repo: HelmRepository | None) -> str:
     """Return the helm chart name used for the helm template command."""
     if release.chart.repo_kind == HELM_REPOSITORY:
-        if repo.repo_type == REPO_TYPE_OCI:
+        if repo and repo.repo_type == REPO_TYPE_OCI:
             return f"{repo.url}/{release.chart.name}"
         return release.chart.chart_name
     elif release.chart.repo_kind == GIT_REPOSITORY:
@@ -79,7 +79,6 @@ def _chart_name(release: HelmRelease, repo: HelmRepository | None) -> str:
     )
 
 
-
 class RepositoryConfig:
     """Generates a helm repository configuration from flux HelmRepository objects."""
 
diff --git a/flux_local/kustomize.py b/flux_local/kustomize.py
index eaeb0f9d..f3fba196 100644
--- a/flux_local/kustomize.py
+++ b/flux_local/kustomize.py
@@ -37,6 +37,7 @@
 from aiofiles.ospath import isdir
 import asyncio
 from contextlib import asynccontextmanager
+from collections.abc import AsyncIterator
 import logging
 from pathlib import Path
 import tempfile
@@ -70,6 +71,7 @@
 # Used to limit access to specific resources
 _LOCK_MAP: dict[str, asyncio.Lock] = {}
 
+
 class Kustomize:
     """Library for issuing a kustomize command."""
 
@@ -194,9 +196,9 @@ async def run(self, stdin: bytes | None = None) -> bytes:
 
 
 @asynccontextmanager
-async def _resource_lock(key: str):
+async def _resource_lock(key: str) -> AsyncIterator[None]:
     """Run while holding a lock for the specified resource.
-    
+
     This is not threadsafe and expected to be run in the asyncio loop.
     """
     if not (lock := _LOCK_MAP.get(key)):
diff --git a/flux_local/manifest.py b/flux_local/manifest.py
index cf3efd2c..1bef480c 100644
--- a/flux_local/manifest.py
+++ b/flux_local/manifest.py
@@ -82,7 +82,7 @@ def parse_yaml(cls, content: str) -> "BaseManifest":
 
     def yaml(self, exclude: dict[str, Any] | None = None) -> str:
         """Return a YAML string representation of compact_dict."""
-        return yaml_encode(self, self.__class__)
+        return yaml_encode(self, self.__class__)  # type: ignore[return-value]
 
     class Config(BaseConfig):
         omit_none = True
diff --git a/pyproject.toml b/pyproject.toml
index fdbf6fa1..8d2b4a41 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,14 +14,6 @@ warn_unused_configs = true
 warn_unused_ignores = true
 disable_error_code = [
     "import-untyped",
-    # TODO: Fix these warnings
-    "assignment",
-    "attr-defined",
-    "return-value",
-    "no-untyped-def",
-    "union-attr",
-    "assignment",
-    "arg-type",
 ]
 extra_checks = false
 check_untyped_defs = true
diff --git a/script/run-mypy.sh b/script/run-mypy.sh
index fc3804b4..eede4d73 100755
--- a/script/run-mypy.sh
+++ b/script/run-mypy.sh
@@ -2,9 +2,11 @@
 
 set -o errexit
 
-# Change directory to the project root directory.
-cd "$(dirname "$0")"
+# other common virtualenvs
+my_path=$(git rev-parse --show-toplevel)
 
-pip3 install -r requirements_dev.txt --no-input --quiet
+if [ -f "${my_path}/venv/bin/activate" ]; then
+  . "${my_path}/venv/bin/activate"
+fi
 
-mypy .
+mypy ${my_path}
diff --git a/tests/test_command.py b/tests/test_command.py
index 2ae75afd..64cae890 100644
--- a/tests/test_command.py
+++ b/tests/test_command.py
@@ -2,7 +2,8 @@
 
 import pytest
 
-from flux_local.command import Command, CommandException, run, run_piped
+from flux_local.command import Command, run, run_piped
+from flux_local.exceptions import CommandException
 
 
 async def test_command() -> None:
diff --git a/tests/test_git_repo.py b/tests/test_git_repo.py
index ee0128f1..71135d53 100644
--- a/tests/test_git_repo.py
+++ b/tests/test_git_repo.py
@@ -85,7 +85,7 @@ async def test_kustomization_visitor(snapshot: SnapshotAssertion) -> None:
     query.path.path = TESTDATA
 
     stream = io.StringIO()
-    visits: list[tuple[str, str, str, str]] = []
+    visits: list[tuple[str, str, str]] = []
 
     async def write(x: Path, y: Any, cmd: Kustomize | None) -> None:
         visits.append((str(x), y.namespace, y.name))
@@ -112,7 +112,7 @@ async def test_helm_repo_visitor(snapshot: SnapshotAssertion) -> None:
     query = ResourceSelector()
     query.path.path = TESTDATA
 
-    visits: list[tuple[str, str, str, str]] = []
+    visits: list[tuple[str, str, str]] = []
 
     async def append(x: Path, y: Any, z: Any) -> None:
         visits.append((str(x), y.namespace, y.name))
@@ -132,7 +132,7 @@ async def test_helm_release_visitor(snapshot: SnapshotAssertion) -> None:
     query = ResourceSelector()
     query.path.path = TESTDATA
 
-    visits: list[tuple[str, str, str, str]] = []
+    visits: list[tuple[str, str, str]] = []
 
     async def append(x: Path, y: Any, z: Any) -> None:
         visits.append((str(x), y.namespace, y.name))