diff --git a/oneup/cli.py b/oneup/cli.py
index fe8e236..aed7d4e 100644
--- a/oneup/cli.py
+++ b/oneup/cli.py
@@ -125,8 +125,14 @@ def scan_file(requirements_file_path: Path) -> None:
             tool_specs = parsed_toml["tool"]
             if "poetry" in tool_specs:
                 poetry_specs = tool_specs["poetry"]
-                if "dependencies" in poetry_specs:
-                    dependencies = list(poetry_specs["dependencies"].keys())
+                dependencies = []
+
+                for key in ("dependencies", "dev-dependencies"):
+                    if key in poetry_specs:
+                        dependencies.extend(
+                            list(poetry_specs["dependencies"].keys())
+                        )
+
 
         for dependency in dependencies:
             print_project_latest_version(dependency)