diff --git a/stubs/Pygments/METADATA.toml b/stubs/Pygments/METADATA.toml
index 45a1bcecf0b2..7df9c1b91951 100644
--- a/stubs/Pygments/METADATA.toml
+++ b/stubs/Pygments/METADATA.toml
@@ -1,4 +1,4 @@
-version = "2.19.*"
+version = "2.20.*"
 upstream_repository = "https://github.com/pygments/pygments"
 dependencies = ["types-docutils"]
 partial_stub = true
diff --git a/stubs/Pygments/pygments/regexopt.pyi b/stubs/Pygments/pygments/regexopt.pyi
index f289a9950759..09558fd6319a 100644
--- a/stubs/Pygments/pygments/regexopt.pyi
+++ b/stubs/Pygments/pygments/regexopt.pyi
@@ -1,8 +1,10 @@
 from _typeshed import Incomplete
+from collections.abc import Iterable
 
 CS_ESCAPE: Incomplete
 FIRST_ELEMENT: Incomplete
 
+def commonprefix(m: Iterable[str]) -> str: ...
 def make_charset(letters): ...
 def regex_opt_inner(strings, open_paren): ...
 def regex_opt(strings, prefix: str = "", suffix: str = ""): ...