diff --git a/puppet/kandra/files/statuspage-pusher b/puppet/kandra/files/statuspage-pusher
index e7755b3989..2ef22d421c 100755
--- a/puppet/kandra/files/statuspage-pusher
+++ b/puppet/kandra/files/statuspage-pusher
@@ -22,7 +22,7 @@ def fetch_metric(metric_id: str, query: str) -> float:
     conn.close()
     data = json.loads(raw_bytes)
     if data["status"] != "success":
-        raise Exception("Failed to request {metric_id}: {raw_bytes.decode()}")
+        raise Exception(f"Failed to request {metric_id}: {raw_bytes.decode()}")
     return float(data["data"]["result"][0]["value"][1])
 
 
diff --git a/scripts/setup/compare-settings-to-template b/scripts/setup/compare-settings-to-template
index 92a058dc08..f49e07d6f5 100755
--- a/scripts/setup/compare-settings-to-template
+++ b/scripts/setup/compare-settings-to-template
@@ -65,7 +65,7 @@ print(f"Most likely version: {likely[0]}")
 diff = difflib.unified_diff(
     templ[likely[0]].splitlines(keepends=True),
     current_contents.splitlines(keepends=True),
-    fromfile="zulip-server-{version}/zproject/prod_settings_template.py",
+    fromfile=f"zulip-server-{version}/zproject/prod_settings_template.py",
     tofile=current_path,
 )
 
diff --git a/tools/droplets/create.py b/tools/droplets/create.py
index 1516a61cae..d3ee999956 100644
--- a/tools/droplets/create.py
+++ b/tools/droplets/create.py
@@ -318,7 +318,7 @@ if __name__ == "__main__":
     if args.subdomain:
         subdomain = args.subdomain.lower()
     elif args.production:
-        subdomain = "{username}-prod"
+        subdomain = f"{username}-prod"
     else:
         subdomain = username
 
diff --git a/zerver/tests/test_external.py b/zerver/tests/test_external.py
index 44b150eea7..58fd2427b2 100644
--- a/zerver/tests/test_external.py
+++ b/zerver/tests/test_external.py
@@ -196,7 +196,7 @@ class RateLimitTests(ZulipTestCase):
         user = self.example_user("cordelia")
         RateLimitedUser(user).clear_history()
 
-        emails = ["new-email-{n}@zulip.com" for n in range(1, 8)]
+        emails = [f"new-email-{n}@zulip.com" for n in range(1, 8)]
         self.do_test_hit_ratelimits(
             lambda: self.api_patch(user, "/api/v1/settings", {"email": emails.pop()}),
         )