diff --git a/stubs/parsimonious/METADATA.toml b/stubs/parsimonious/METADATA.toml
index 29511ee7d..51e869b47 100644
--- a/stubs/parsimonious/METADATA.toml
+++ b/stubs/parsimonious/METADATA.toml
@@ -1 +1 @@
-version = "0.8.*"
+version = "0.9.*"
diff --git a/stubs/parsimonious/parsimonious/expressions.pyi b/stubs/parsimonious/parsimonious/expressions.pyi
index efb8db7b0..8f1e5bc8a 100644
--- a/stubs/parsimonious/parsimonious/expressions.pyi
+++ b/stubs/parsimonious/parsimonious/expressions.pyi
@@ -47,6 +47,7 @@ class Regex(Expression):
         dot_all: bool = ...,
         unicode: bool = ...,
         verbose: bool = ...,
+        ascii: bool = ...,
     ) -> None: ...
 
 class Compound(Expression):