diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index b1a99e0b..b5051e13 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -15,7 +15,7 @@ repos:
     -   id: flake8
         args: [ "--select=E9,F63,F7,F82"]
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v2.11.0
+    rev: v2.12.0
     hooks:
     -   id: pyupgrade
         args: ['--py36-plus','--exit-zero-even-if-changed']
\ No newline at end of file
diff --git a/popmon/hist/hist_utils.py b/popmon/hist/hist_utils.py
index 238dc361..1c70a192 100644
--- a/popmon/hist/hist_utils.py
+++ b/popmon/hist/hist_utils.py
@@ -170,9 +170,7 @@ def project_split2dhist_on_axis(splitdict, axis="x"):
     :rtype: SortedDict
     """
     if not isinstance(splitdict, dict):
-        raise TypeError(
-            "splitdict: {wt}, type should be a dictionary.".format(wt=type(splitdict))
-        )
+        raise TypeError(f"splitdict: {type(splitdict)}, type should be a dictionary.")
     if axis not in ["x", "y"]:
         raise ValueError(f"axis: {axis}, can only be x or y.")