diff --git a/README.md b/README.md
index 6fedee8..7d9ff2d 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 macOS
-This software works on macOS 10.10 (Yosemite) or later. It runs on any Mac with a 64-bit Intel processor or an Apple Silicon chip. It has been tested on 12.7.3 (Monterey) and 14.3 (Sonoma).
+This software works on macOS 10.10 (Yosemite) or later. It runs on any Mac with a 64-bit Intel processor or an Apple Silicon chip. It has been tested on 12.7.3 (Monterey) and 14.3.1 (Sonoma).
 Though Sylpheed for macOS 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 fcd1dbe..11166c7 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 macOS\
 \pard\tx566\tx1133\tx1700\tx2267\tx2834\tx3401\tx3968\tx4535\tx5102\tx5669\tx6236\tx6803\ql\qnatural\pardirnatural
 
-\b0 \cf0 This software works on macOS 10.10 (Yosemite) or later. It runs on any Mac with a 64-bit Intel processor or an Apple Silicon chip. It has been tested on 12.7.3 (Monterey) and 14.3 (Sonoma).\
+\b0 \cf0 This software works on macOS 10.10 (Yosemite) or later. It runs on any Mac with a 64-bit Intel processor or an Apple Silicon chip. It has been tested on 12.7.3 (Monterey) and 14.3.1 (Sonoma).\
 Though Sylpheed for macOS 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