diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 6917d11..ed2c92b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -33,7 +33,7 @@ repos:
         # Checks that all your JSON files are pretty.
   - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-    rev: v0.8.6
+    rev: v0.9.1
     hooks:
       # Run the linter.
       - id: ruff
diff --git a/gcn_email/core.py b/gcn_email/core.py
index 2d6aa25..5d3d03b 100644
--- a/gcn_email/core.py
+++ b/gcn_email/core.py
@@ -20,7 +20,7 @@
 from .helpers import periodic_task
 
 SESV2 = boto3.client("sesv2")
-SENDER = f'GCN Notices <{os.environ["EMAIL_SENDER"]}>'
+SENDER = f"GCN Notices <{os.environ['EMAIL_SENDER']}>"
 
 # Maximum send rate
 MAX_SENDS = boto3.client("ses").get_send_quota()["MaxSendRate"]