diff --git a/assets/testing/duc-files/heads.duc b/assets/testing/duc-files/heads.duc
new file mode 100644
index 0000000..a9fadea
Binary files /dev/null and b/assets/testing/duc-files/heads.duc differ
diff --git a/packages/ducpy/pyproject.toml b/packages/ducpy/pyproject.toml
index 9556dad..304e73b 100644
--- a/packages/ducpy/pyproject.toml
+++ b/packages/ducpy/pyproject.toml
@@ -6,6 +6,7 @@ readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
     "nanoid>=2.0.0",
+    "numpy>=1.20.0",
 ]
 
 license = { text = "MIT" }
@@ -32,6 +33,7 @@ build-backend = "maturin"
 [tool.maturin]
 manifest-path = "crate/Cargo.toml"
 python-source = "src"
+python-packages = ["ducpy", "ducpy_native"]
 module-name = "ducpy_native"
 include = [
     { path = "LICENSE", format = "sdist" },
@@ -49,7 +51,6 @@ dev = [
     "sphinx>=8.1.3",
     "sphinx-autoapi>=3.6.0",
     "pytest>=8.3.5",
-    "numpy>=1.20.0",
     "rich>=13.0.0",
 ]
 
diff --git a/packages/ducpy/uv.lock b/packages/ducpy/uv.lock
index c626705..245134b 100644
--- a/packages/ducpy/uv.lock
+++ b/packages/ducpy/uv.lock
@@ -143,12 +143,12 @@ name = "ducpy"
 source = { editable = "." }
 dependencies = [
     { name = "nanoid" },
+    { name = "numpy" },
 ]
 
 [package.dev-dependencies]
 dev = [
     { name = "furo" },
-    { name = "numpy" },
     { name = "pytest" },
     { name = "rich" },
     { name = "sphinx", version = "8.1.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.11'" },
@@ -157,12 +157,14 @@ dev = [
 ]
 
 [package.metadata]
-requires-dist = [{ name = "nanoid", specifier = ">=2.0.0" }]
+requires-dist = [
+    { name = "nanoid", specifier = ">=2.0.0" },
+    { name = "numpy", specifier = ">=1.20.0" },
+]
 
 [package.metadata.requires-dev]
 dev = [
     { name = "furo", specifier = ">=2024.8.6" },
-    { name = "numpy", specifier = ">=1.20.0" },
     { name = "pytest", specifier = ">=8.3.5" },
     { name = "rich", specifier = ">=13.0.0" },
     { name = "sphinx", specifier = ">=8.1.3" },