[fix] update --outdated raises NonExistentKey with dev package

closes pypa#5540

pipenv update --outdated fail with NonExistentKey error when there are
outdated packages in dev-packages category.

news/5540.bugfix.rst

@@ -0,0 +1 @@
+Fix: `update --outdated` raises NonExistentKey with outdated dev packages

pipenv/core.py

@@ -2081,7 +2081,7 @@ def do_outdated(project, pypi_mirror=None, pre=False, clear=False):
             )
             if name_in_pipfile:
                 required = ""
-                version = get_version(project.packages[name_in_pipfile])
+                version = get_version(project.get_pipfile_section(category)[name_in_pipfile])
                 rdeps = reverse_deps.get(canonicalize_name(package))
                 if isinstance(rdeps, Mapping) and "required" in rdeps:
                     required = " {} required".format(rdeps["required"])

pyproject.toml

@@ -78,6 +78,7 @@ filterwarnings = [
 # `pipenv run pytest --markers` will list all markers inlcuding these
 markers = [
     "install: tests having to do with `pipenv install`",
+    "update: tests having to do with `pipenv update`",
     "needs_internet: integration tests that require internet to pass",
     "basic: basic pipenv tests grouping",
     "dev: tests having to do with dev and dev packages",

tests/integration/test_update.py

@@ -0,0 +1,21 @@
+import pytest
+
+@pytest.mark.basic
+@pytest.mark.update
+def test_update_outdated(pipenv_instance_private_pypi):
+    with pipenv_instance_private_pypi() as p:
+        package_name = "six"
+        p.pipenv("install {}~=1.15".format(package_name))
+        c = p.pipenv("update --outdated")
+        assert c.stdout_bytes.decode("utf-8").startswith("Package {} out-of-date:".format(package_name))
+        assert c.returncode == 0
+
+@pytest.mark.basic
+@pytest.mark.update
+def test_update_outdated_with_outdated_dev_package(pipenv_instance_private_pypi):
+    with pipenv_instance_private_pypi() as p:
+        package_name = "six"
+        p.pipenv("install -d {}~=1.15".format(package_name))
+        c = p.pipenv("update --outdated")
+        assert c.stdout_bytes.decode("utf-8").startswith("Package {} out-of-date:".format(package_name))
+        assert c.returncode == 0