diff --git a/pyproject.toml b/pyproject.toml
index 6ec4b6173..828a814a9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -232,6 +232,7 @@ select = [
     "T10",  # flake8-debugger
     "ISC",  # flake8-implicit-str-concat
     "ICN",  # flake8-import-conventions
+    "INP",  # flake8-no-pep420
     "PIE",  # flake8-pie
     "PT",   # flake8-pytest-style
 ]
@@ -239,7 +240,11 @@ src = ["samples", "singer_sdk", "tests"]
 target-version = "py37"
 
 [tool.ruff.per-file-ignores]
-"docs/conf.py" = ["D", "I002"]
+"docs/conf.py" = [
+    "D",      # pydocstyle/flake8-docstrings
+    "I002",   # isort: missing-required-import
+    "INP001", # flake8-no-pep420: implicit-namespace-package
+]
 "noxfile.py" = ["ANN"]
 "tests/*" = ["ANN", "D1", "D2"]
 # Disabled some checks in samples code
diff --git a/samples/aapl/__init__.py b/samples/aapl/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/_singerlib/__init__.py b/tests/_singerlib/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/cookiecutters/__init__.py b/tests/cookiecutters/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/core/configuration/__init__.py b/tests/core/configuration/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/core/rest/__init__.py b/tests/core/rest/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/samples/__init__.py b/tests/samples/__init__.py
new file mode 100644
index 000000000..e69de29bb