diff --git a/Misc/ACKS b/Misc/ACKS
index 42ff010..95f12ef 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -626,6 +626,7 @@
 Aaron Iles
 Lars Immisch
 Bobby Impollonia
+Naoki Inada
 Meador Inge
 Peter Ingebretson
 Tony Ingraldi
diff --git a/Misc/NEWS b/Misc/NEWS
index 9a10abf..3c71d9e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -203,6 +203,9 @@
 Library
 -------
 
+- Issue #23206: Make ``json.dumps(..., ensure_ascii=False)`` as fast as the
+  default case of ``ensure_ascii=True``.  Patch by Naoki Inada.
+
 - Issue #23185: Add math.inf and math.nan constants.
 
 - Issue #23186: Add ssl.SSLObject.shared_ciphers() and