diff --git a/scripts/update_core_lowerbound.py b/scripts/update_core_lowerbound.py
index 17ed63bc..c02aeb27 100755
--- a/scripts/update_core_lowerbound.py
+++ b/scripts/update_core_lowerbound.py
@@ -4,14 +4,13 @@
 import tomlkit
 import yaml
 from packaging.requirements import Requirement
-from packaging.version import parse
+from packaging.version import Version
 
 
-core_template_url = "https://raw.githubusercontent.com/pulp/pulpcore/main/template_config.yml"
+CORE_TEMPLATE_URL = "https://raw.githubusercontent.com/pulp/pulpcore/main/template_config.yml"
 
 
-def scan_requirement(line, supported_versions):
-    updated = False
+def scan_requirement(line: str, supported_versions: set[Version]) -> str | None:
     new_requirement = None
     try:
         requirement = Requirement(line)
@@ -21,8 +20,11 @@ def scan_requirement(line, supported_versions):
         if requirement.name == "pulpcore":
             for spec in requirement.specifier:
                 if spec.operator == ">=":
-                    min_version = parse(spec.version)
-                    if parse(f"{min_version.major}.{min_version.minor}") not in supported_versions:
+                    min_version = Version(spec.version)
+                    if (
+                        Version(f"{min_version.major}.{min_version.minor}")
+                        not in supported_versions
+                    ):
                         # Lowerbound is not a supported branch, modify to next lowest
                         valid_lowerbounds = list(requirement.specifier.filter(supported_versions))
                         if valid_lowerbounds:
@@ -30,26 +32,27 @@ def scan_requirement(line, supported_versions):
                             new_min_version = f"{new_min_branch.major}.{new_min_branch.minor}.0"
                             print(f"Lower bounds updated to >={new_min_version}")
                             new_requirement = line.replace(spec.version, new_min_version)
-                            updated = True
+                        elif min_version > max(supported_versions):
+                            print("This requirement is newer than any (yet) supported branches.")
                         else:
-                            print(supported_versions)
                             print(
-                                "No supported lower bounds can satisfy requirement"
-                                " range, this branch can no longer be supported."
+                                f"No supported lower bounds {supported_versions} can satisfy"
+                                " requirement range {requirement.specifier}, this branch can no"
+                                " longer be supported."
                             )
                             exit(1)
                     break
-    return updated, new_requirement
+    return new_requirement
 
 
-def scan_pyproject_toml(supported_versions):
+def scan_pyproject_toml(supported_versions: set[Version]) -> None:
     changed = False
     with open("pyproject.toml") as fp:
         pyproject = tomlkit.load(fp)
-        requirements = pyproject["project"]["dependencies"]
+        requirements: list[str] = pyproject["project"]["dependencies"]
         for i, line in enumerate(requirements):
-            updated, new_requirement = scan_requirement(line, supported_versions)
-            if updated:
+            new_requirement = scan_requirement(line, supported_versions)
+            if new_requirement is not None:
                 requirements[i] = new_requirement
                 changed = True
     if changed:
@@ -57,14 +60,14 @@ def scan_pyproject_toml(supported_versions):
             tomlkit.dump(pyproject, fp)
 
 
-def scan_requirements_txt(supported_versions):
+def scan_requirements_txt(supported_versions: set[Version]) -> None:
     changed = False
     with open("requirements.txt") as fp:
         lines = fp.readlines()
         for i, line in enumerate(lines):
             requirement, sep, comment = line.partition(" #")
-            updated, new_requirement = scan_requirement(requirement, supported_versions)
-            if updated:
+            new_requirement = scan_requirement(requirement, supported_versions)
+            if new_requirement is not None:
                 lines[i] = new_requirement + sep + comment
                 changed = True
     if changed:
@@ -72,16 +75,14 @@ def scan_requirements_txt(supported_versions):
             fp.writelines(lines)
 
 
-def main():
-    request = requests.get(core_template_url)
+def main() -> None:
+    request = requests.get(CORE_TEMPLATE_URL)
     if request.status_code != 200:
         print("Failed to find supported branches, not checking lower bounds")
         exit(0)
 
     core_template = yaml.safe_load(request.content)
-    supported_versions = {parse(v) for v in core_template["supported_release_branches"]}
-    latest = core_template["latest_release_branch"]
-    supported_versions.add(parse(latest))
+    supported_versions = {Version(v) for v in core_template["supported_release_branches"]}
     try:
         scan_pyproject_toml(supported_versions)
     except Exception: