diff --git a/repology/parsers/parsers/ros.py b/repology/parsers/parsers/ros.py
index 397f8cb9..2583a8b1 100644
--- a/repology/parsers/parsers/ros.py
+++ b/repology/parsers/parsers/ros.py
@@ -30,54 +30,54 @@
 
 
 def ros_extract_recipe_url(key, /, *, url, tags, version, **kwargs):
-    release = tags["release"].format(
+    release = tags['release'].format(
         package=key,
         version=version,
         upstream_version=version,
     )
 
-    if "github.com" in url:
-        return url.removesuffix(".git") + f"/blob/{release}/package.xml"
-    if "gitlab" in url:
-        return url.removesuffix(".git") + f"/-/blob/{release}/package.xml"
+    if 'github.com' in url:
+        return url.removesuffix('.git') + f'/blob/{release}/package.xml'
+    if 'gitlab' in url:
+        return url.removesuffix('.git') + f'/-/blob/{release}/package.xml'
 
 
 class RosYamlParser(Parser):
     def iter_parse(self, path: str, factory: PackageFactory) -> Iterable[PackageMaker]:
         with open(path) as f:
             data = load(f, Loader=Loader)
-        for key, packagedata in data["repositories"].items():
+        for key, packagedata in data['repositories'].items():
             with factory.begin(key) as pkg:
                 # Some included packages are not yet released,
                 # and only available as source
-                if "release" not in packagedata:
-                    pkg.log(f"dropping {pkg}: no release", severity=Logger.ERROR)
+                if 'release' not in packagedata:
+                    pkg.log(f'dropping {pkg}: no release', severity=Logger.ERROR)
                     continue
 
-                release = packagedata["release"]
+                release = packagedata['release']
 
-                if "version" not in release:
-                    pkg.log(f"dropping {pkg}: has no version.", severity=Logger.ERROR)
+                if 'version' not in release:
+                    pkg.log(f'dropping {pkg}: has no version.', severity=Logger.ERROR)
                     continue
 
-                if "bitbucket" in release["url"]:
-                    pkg.log(f"dropping {pkg}: RIP bitbucket", severity=Logger.ERROR)
+                if 'bitbucket' in release['url']:
+                    pkg.log(f'dropping {pkg}: RIP bitbucket', severity=Logger.ERROR)
                     continue
 
                 pkg.add_name(key, NameType.ROS_NAME)
-                pkg.set_version(release["version"].split("-")[0])
+                pkg.set_version(release['version'].split('-')[0])
 
                 if recipe_url := ros_extract_recipe_url(key, **release):
                     pkg.add_links(LinkType.PACKAGE_RECIPE, recipe_url)
                 else:
-                    pkg.log(f"{pkg} has no known recipe url", severity=Logger.WARNING)
+                    pkg.log(f'{pkg} has no known recipe url', severity=Logger.WARNING)
 
-                if source := packagedata.get("source"):
-                    pkg.add_links(LinkType.UPSTREAM_HOMEPAGE, source["url"])
+                if source := packagedata.get('source'):
+                    pkg.add_links(LinkType.UPSTREAM_HOMEPAGE, source['url'])
                 else:
-                    pkg.log(f"{pkg} has no source", severity=Logger.WARNING)
+                    pkg.log(f'{pkg} has no source', severity=Logger.WARNING)
 
-                if doc := packagedata.get("doc"):
-                    pkg.add_links(LinkType.UPSTREAM_DOCUMENTATION, doc["url"])
+                if doc := packagedata.get('doc'):
+                    pkg.add_links(LinkType.UPSTREAM_DOCUMENTATION, doc['url'])
 
                 yield pkg