diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 32c915cc7..62294a283 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -22,7 +22,7 @@ repos:
     - types-requests
     args: ["."]
 - repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: v0.6.9
+  rev: v0.8.4
   hooks:
   - id: ruff
   - id: ruff-format
diff --git a/message_ix/tests/test_report.py b/message_ix/tests/test_report.py
index 25e721be2..53f8f7d94 100644
--- a/message_ix/tests/test_report.py
+++ b/message_ix/tests/test_report.py
@@ -204,30 +204,34 @@ def add_tm(df, name="Activity"):
     assert not any(c in df2.columns for c in ["h", "m", "t"])
 
     # Variable names were formatted by the callback
-    reg_var = pd.DataFrame(
-        [
-            ["seattle", "Activity|canning_plant|production"],
-            ["seattle", "Activity|transport_from_seattle|to_new-york"],
-            ["seattle", "Activity|transport_from_seattle|to_chicago"],
-            ["seattle", "Activity|transport_from_seattle|to_topeka"],
-            ["san-diego", "Activity|canning_plant|production"],
-            ["san-diego", "Activity|transport_from_san-diego|to_new-york"],
-            ["san-diego", "Activity|transport_from_san-diego|to_chicago"],
-            ["san-diego", "Activity|transport_from_san-diego|to_topeka"],
-        ],
-        columns=["region", "variable"],
-    ) if sys.version_info >= (3, 10) else pd.DataFrame(
-        [
-            ["san-diego", "Activity|canning_plant|production"],
-            ["san-diego", "Activity|transport_from_san-diego|to_chicago"],
-            ["san-diego", "Activity|transport_from_san-diego|to_new-york"],
-            ["san-diego", "Activity|transport_from_san-diego|to_topeka"],
-            ["seattle", "Activity|canning_plant|production"],
-            ["seattle", "Activity|transport_from_seattle|to_chicago"],
-            ["seattle", "Activity|transport_from_seattle|to_new-york"],
-            ["seattle", "Activity|transport_from_seattle|to_topeka"],
-        ],
-        columns=["region", "variable"],
+    reg_var = (
+        pd.DataFrame(
+            [
+                ["seattle", "Activity|canning_plant|production"],
+                ["seattle", "Activity|transport_from_seattle|to_new-york"],
+                ["seattle", "Activity|transport_from_seattle|to_chicago"],
+                ["seattle", "Activity|transport_from_seattle|to_topeka"],
+                ["san-diego", "Activity|canning_plant|production"],
+                ["san-diego", "Activity|transport_from_san-diego|to_new-york"],
+                ["san-diego", "Activity|transport_from_san-diego|to_chicago"],
+                ["san-diego", "Activity|transport_from_san-diego|to_topeka"],
+            ],
+            columns=["region", "variable"],
+        )
+        if sys.version_info >= (3, 10)
+        else pd.DataFrame(
+            [
+                ["san-diego", "Activity|canning_plant|production"],
+                ["san-diego", "Activity|transport_from_san-diego|to_chicago"],
+                ["san-diego", "Activity|transport_from_san-diego|to_new-york"],
+                ["san-diego", "Activity|transport_from_san-diego|to_topeka"],
+                ["seattle", "Activity|canning_plant|production"],
+                ["seattle", "Activity|transport_from_seattle|to_chicago"],
+                ["seattle", "Activity|transport_from_seattle|to_new-york"],
+                ["seattle", "Activity|transport_from_seattle|to_topeka"],
+            ],
+            columns=["region", "variable"],
+        )
     )
     assert_frame_equal(df2[["region", "variable"]], reg_var)