diff --git a/README.md b/README.md
index 4eeb5ed..431534d 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 Sylpheed is a free software distributed under the [GNU GPL](https://www.gnu.org/licenses/old-licenses/gpl-2.0.html).
 
 ## About Sylpheed for Mac OS X
-This software works on Mac OS X 10.9 (Mavericks) or later. It runs on any Mac with a 64-bit Intel processor or an Apple Silicon chip. It has been tested on 10.9.5 (Mavericks), 10.11.6 (El Capitan) and 13.1 (Ventura).
+This software works on Mac OS X 10.9 (Mavericks) or later. It runs on any Mac with a 64-bit Intel processor or an Apple Silicon chip. It has been tested on 10.9.5 (Mavericks), 10.11.6 (El Capitan) and 13.4 (Ventura).
 Though Sylpheed for Mac OS X is stable, please note that it has various issues because it is still testing stage.
 
 ## Screenshots
diff --git a/misc/README.rtf b/misc/README.rtf
index d6437f9..bfa3866 100644
--- a/misc/README.rtf
+++ b/misc/README.rtf
@@ -26,7 +26,7 @@ Sylpheed is a free software distributed under the GNU GPL.\
 \b \cf0 About Sylpheed for Mac OS X\
 \pard\tx566\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\ql\qnatural\pardirnatural
 
-\b0 \cf0 This software works on Mac OS X 10.9 (Mavericks) or later. It runs on any Mac with a 64-bit Intel processor or an Apple Silicon chip. It has been tested on 10.9.5 (Mavericks), 10.11.6 (El Capitan) and 13.1 (Ventura).\
+\b0 \cf0 This software works on Mac OS X 10.9 (Mavericks) or later. It runs on any Mac with a 64-bit Intel processor or an Apple Silicon chip. It has been tested on 10.9.5 (Mavericks), 10.11.6 (El Capitan) and 13.4 (Ventura).\
 Though Sylpheed for Mac OS X is stable, please note that it has various issues because it is still testing stage.\
 \
 \pard\tx566\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\sl480\slmult1\ql\qnatural\pardirnatural