diff --git a/MANIFEST.in b/MANIFEST.in
index 111896b..87e9710 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,2 +1,3 @@
 recursive-include cpp_source *.hpp
-recursive-include irspack *.pyi
+recursive-include src/irspack *.pyi
+include src/irspack/py.typed
diff --git a/pyproject.toml b/pyproject.toml
index 73cb4f6..9f18b3f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,11 +7,22 @@ readme = "Readme.md"
 authors = [
     { name = "Tomoki Ohtsuki", email = "tomoki.ohtsuki.19937@outlook.jp" },
 ]
+requires-python = ">=3.9"
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Developers",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Topic :: Scientific/Engineering",
+]
 dependencies = [
   "httpx",
   "gidgethub[httpx]>4.0.0",
   "numpy >= 2.0",
-  "fastprogress >= 0.2",
+  "fastprogress>=0.2,<=1.0.5",
   "optuna>=2.5.0",
   "pandas>=2.2.0",
   "scikit-learn>=0.21.0",
@@ -31,7 +42,7 @@ build-dir = "build/{wheel_tag}"
 # Build stable ABI wheels for CPython 3.12+
 wheel.py-api = "cp312"
 metadata.version.provider = "scikit_build_core.metadata.setuptools_scm"
-sdist.include = ["src/irspack/_version.py"]
+sdist.include = ["src/irspack/_version.py", "src/irspack/**/*.pyi", "src/irspack/py.typed"]
 
 
 [build-system]
diff --git a/py.typed b/src/irspack/py.typed
similarity index 100%
rename from py.typed
rename to src/irspack/py.typed