diff --git a/CHANGES.rst b/CHANGES.rst
index cbe777618..ad91a9c07 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -8,7 +8,7 @@ v9.9.9 (unreleased)
 - chore: bump actions/checkout version (#1772, #1776)
 - chore: bump actions/setup-python version (#1773, #1775)
 - refactor: switch to pyproject.toml (#1753)
-- chore: bump dependencies (#1774)
+- chore: bump dependencies (#1774, #1777)
 
 
 v6.2.1 (2026-06-06)
diff --git a/pyproject.toml b/pyproject.toml
index a20b1e6ab..c01fec18e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ telegram = ["python-telegram-bot==13.15"]
 XMPP = [
     "slixmpp==1.12.0; python_version < '3.11'",
     "slixmpp==1.15.0; python_version >= '3.11'",
-    "pyasn1==0.6.3",
+    "pyasn1==0.6.4",
     "pyasn1-modules==0.4.2",
 ]
 test = ["pytest", "requests"]