diff --git a/tools/bump-copyright-years b/tools/bump-copyright-years
index d855f77..92b8200 100755
--- a/tools/bump-copyright-years
+++ b/tools/bump-copyright-years
@@ -26,7 +26,7 @@ _copyright_re = re.compile(r'Copyright (\(c\)|©) ([0-9]{4}-)?([0-9]{4}) '
 def replace_end_year(path, year):
     try:
         lines = open(path, 'r').readlines()
-    except Exception as e:
+    except Exception:
         sys.stderr.write("WARNING: Unable to parse file as text: %s\n" % (path))
         return
     for i in range(len(lines)):
@@ -51,8 +51,9 @@ def bump_years_recursive(target_dir, year):
         if os.path.isfile(child_path):
             try:
                 replace_end_year(child_path, year)
-            except Exception as e:
-                sys.stderr.write("ERROR bumping copyright in file: %s\n" % (child_path))
+            except Exception:
+                sys.stderr.write("ERROR bumping copyright in file: %s\n"
+                                 % (child_path))
                 raise
         elif os.path.isdir(child_path):
             bump_years_recursive(child_path, year)