diff --git a/flepimop2-op_system/pyproject.toml b/flepimop2-op_system/pyproject.toml
index a2073ee..5cf86f9 100644
--- a/flepimop2-op_system/pyproject.toml
+++ b/flepimop2-op_system/pyproject.toml
@@ -78,13 +78,6 @@ ignore = [
 [tool.ruff.lint.pydocstyle]
 convention = "google"
 
-[tool.mypy]
-strict = true
-files = "."
-namespace_packages = true
-explicit_package_bases = true
-mypy_path = "$MYPY_CONFIG_FILE_DIR/src"
-
 [dependency-groups]
 dev = [
   "pytest>=8.4.2",
diff --git a/justfile b/justfile
index 280155e..221f37b 100644
--- a/justfile
+++ b/justfile
@@ -73,8 +73,15 @@ test-root:
 # Run the provider package test suite
 [group('dev')]
 [group('ci')]
-test-provider:
-	{{provider_run}} pytest
+test-provider: provider-sync
+	cd {{provider_dir}} && .venv/bin/python -m pytest
+
+# Create/refresh the provider venv and install all deps (including dev group).
+# Run this once before running provider pytest/mypy if you aren't using `ci`.
+[group('dev')]
+provider-sync:
+	cd {{provider_dir}} && uv venv --clear
+	cd {{provider_dir}} && uv sync --dev
 
 # Run type checks in both packages
 [group('dev')]
@@ -90,8 +97,8 @@ mypy-root:
 # Run mypy for the provider package
 [group('dev')]
 [group('ci')]
-mypy-provider:
-	{{provider_run}} mypy
+mypy-provider: provider-sync
+	cd {{provider_dir}} && .venv/bin/python -m mypy --strict --namespace-packages --explicit-package-bases src/flepimop2
 
 # Run all CI quality checks
 [group('ci')]