--- a/src/eric7/Project/PropertiesDialog.py	Mon Feb 19 19:17:04 2024 +0100
+++ b/src/eric7/Project/PropertiesDialog.py	Wed Feb 21 10:56:24 2024 +0100
@@ -436,7 +436,7 @@
         fn = self.nameEdit.text()
         if fn:
             self.project.name = fn
-            fn = "{0}.epj".format(fn)
+            fn = f"{fn}.epj"
             self.project.pfile = os.path.join(self.project.ppath, fn)
         else:
             self.project.pfile = ""