diff --git a/pyproject.toml b/pyproject.toml
index bcebe32..62bfe3b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -61,14 +61,7 @@ Issues = "https://github.com/adcontextprotocol/adcp-client-python/issues"
 where = ["src"]
 
 [tool.setuptools.package-data]
-adcp = ["py.typed"]
-
-# Include ADCP_VERSION file in package
-[tool.setuptools]
-include-package-data = true
-
-[tool.setuptools.data-files]
-"." = ["ADCP_VERSION"]
+adcp = ["py.typed", "ADCP_VERSION"]
 
 [tool.black]
 line-length = 100
diff --git a/ADCP_VERSION b/src/adcp/ADCP_VERSION
similarity index 100%
rename from ADCP_VERSION
rename to src/adcp/ADCP_VERSION
diff --git a/src/adcp/__init__.py b/src/adcp/__init__.py
index d1443ac..2a18289 100644
--- a/src/adcp/__init__.py
+++ b/src/adcp/__init__.py
@@ -191,15 +191,16 @@ def get_adcp_version() -> str:
     of the AdCP specification.
 
     Returns:
-        AdCP specification version (e.g., "v1", "v2")
+        AdCP specification version (e.g., "2.5.0")
+
+    Raises:
+        FileNotFoundError: If ADCP_VERSION file is missing from package
     """
-    from pathlib import Path
+    from importlib.resources import files
 
-    # Read from ADCP_VERSION file at project root
-    version_file = Path(__file__).parent.parent.parent / "ADCP_VERSION"
-    if version_file.exists():
-        return version_file.read_text().strip()
-    return "v1"  # Fallback
+    # Read from ADCP_VERSION file in package
+    version_file = files("adcp") / "ADCP_VERSION"
+    return version_file.read_text().strip()
 
 __all__ = [
     # Version functions