diff --git a/src/enums/ua-parser-enums.d.ts b/src/enums/ua-parser-enums.d.ts
index 2fb0db5..8dff5ea 100644
--- a/src/enums/ua-parser-enums.d.ts
+++ b/src/enums/ua-parser-enums.d.ts
@@ -288,6 +288,7 @@ export const OS: Readonly<{
     AMIGA_OS: "Amiga OS";
     ANDROID: "Android";
     ANDROID_X86: "Android-x86";
+    ARCAOS: "ArcaOS";
     ARCH: "Arch";
     BADA: "Bada";
     BEOS: "BeOS";
diff --git a/src/enums/ua-parser-enums.js b/src/enums/ua-parser-enums.js
index 0a53cce..4bfcec4 100644
--- a/src/enums/ua-parser-enums.js
+++ b/src/enums/ua-parser-enums.js
@@ -303,6 +303,7 @@ const OS = Object.freeze({
     AMIGA_OS: 'Amiga OS',
     ANDROID: 'Android',
     ANDROID_X86: 'Android-x86',
+    ARCAOS: 'ArcaOS',
     ARCH: 'Arch',
     BADA: 'Bada',
     BEOS: 'BeOS',
diff --git a/src/main/ua-parser.js b/src/main/ua-parser.js
index d3bd002..b399874 100755
--- a/src/main/ua-parser.js
+++ b/src/main/ua-parser.js
@@ -977,7 +977,7 @@
             // Other
             /\b(joli|palm)\b ?(?:os)?\/?([\w\.]*)/i,                            // Joli/Palm
             /(mint)[\/\(\) ]?(\w*)/i,                                           // Mint
-            /(mageia|vectorlinux|fuchsia)[; ]/i,                                // Mageia/VectorLinux/Fuchsia
+            /(mageia|vectorlinux|fuchsia|arcaos)[; ]([\d\.]*)/i,                // Mageia/VectorLinux/Fuchsia/ArcaOS
             /([kxln]?ubuntu|debian|suse|opensuse|gentoo|arch(?= linux)|slackware|fedora|mandriva|centos|pclinuxos|red ?hat|zenwalk|linpus|raspbian|plan 9|minix|risc os|contiki|deepin|manjaro|elementary os|sabayon|linspire)(?: gnu\/linux)?(?: enterprise)?(?:[- ]linux)?(?:-gnu)?[-\/ ]?(?!chrom|package)([-\w\.]*)/i,
                                                                                 // Ubuntu/Debian/SUSE/Gentoo/Arch/Slackware/Fedora/Mandriva/CentOS/PCLinuxOS/RedHat/Zenwalk/Linpus/Raspbian/Plan9/Minix/RISCOS/Contiki/Deepin/Manjaro/elementary/Sabayon/Linspire
             /((?:open)?solaris)[-\/ ]?([\w\.]*)/i,                              // Solaris
diff --git a/test/data/ua/os/arcaos.json b/test/data/ua/os/arcaos.json
new file mode 100644
index 0000000..5097545
--- /dev/null
+++ b/test/data/ua/os/arcaos.json
@@ -0,0 +1,20 @@
+[
+    {
+        "desc"    : "ArcaOS",
+        "ua"      : "Mozilla/5.0 (OS/2; ArcaOS 5.0.6; x86_64; rv:89.0) Gecko/20100101 Firefox/89.0",
+        "expect"  :
+        {
+            "name"    : "ArcaOS",
+            "version" : "5.0.6"
+        }
+    },
+    {
+        "desc"    : "ArcaOS",
+        "ua"      : "Mozilla/5.0 (OS/2; ArcaOS; x64; rv:89.0) Gecko/20100101 Firefox/89.0",
+        "expect"  :
+        {
+            "name"    : "ArcaOS",
+            "version" : "undefined"
+        }
+    }
+]
\ No newline at end of file
diff --git a/test/data/ua/os/os2.json b/test/data/ua/os/os2.json
index cb38c11..56eac7c 100644
--- a/test/data/ua/os/os2.json
+++ b/test/data/ua/os/os2.json
@@ -7,5 +7,23 @@
             "name"    : "OS/2",
             "version" : "undefined"
         }
+    },
+    {
+        "desc"    : "OS/2",
+        "ua"      : "Mozilla/5.0 (OS/2; OS/2 i386) AppleWebKit/538.36 (KHTML, like Gecko) QtWebEngine/5.15.2 Chrome/127.0.6533.72",
+        "expect"  :
+        {
+            "name"    : "OS/2",
+            "version" : "undefined"
+        }
+    },
+    {
+        "desc"    : "OS/2",
+        "ua"      : "Mozilla/5.0 (OS/2; Warp 4.5; rv:45.0) Gecko/20100101 Firefox/45.0",
+        "expect"  :
+        {
+            "name"    : "OS/2",
+            "version" : "undefined"
+        }
     }
 ]
\ No newline at end of file