diff --git a/stdlib/2and3/imaplib.pyi b/stdlib/2and3/imaplib.pyi
index 2179167bb..bb9e9c6db 100644
--- a/stdlib/2and3/imaplib.pyi
+++ b/stdlib/2and3/imaplib.pyi
@@ -93,6 +93,8 @@ class IMAP4:
     def thread(self, threading_algorithm: str, charset: str, *search_criteria: str) -> _CommandResults: ...
     def uid(self, command: str, *args: str) -> _CommandResults: ...
     def unsubscribe(self, mailbox: str) -> _CommandResults: ...
+    if sys.version_info >= (3, 9):
+        def unselect(self) -> _CommandResults: ...
     def xatom(self, name: str, *args: str) -> _CommandResults: ...
     def print_log(self) -> None: ...