diff --git a/docs/firmware.md b/docs/firmware.md
index 6634b5e..0fe8ee4 100644
--- a/docs/firmware.md
+++ b/docs/firmware.md
@@ -141,6 +141,7 @@ JVS I/Oとして利用する前、特にジャンパーピンを実装した人
 - Ver 2.19 Real Arcade Pro.N HAYABUSAと後期V3.SAをサポート、バスリセット再調整
 - Ver 2.20 GT Force Proをサポート、シフトギアエミュレーションの試験実装
 - Ver 2.21 JVS Dashモード時に連射がまともに機能していなかったのを修正
+- Ver 2.22 アナログ入力の値を反転する設定機能を追加
 
 ## ファームウェアの互換性
 V3系基板は、v1.48とv2.11以降のファームウェアのみ動作します。v1/v2系基板は全てのファームウェアが動作します。
@@ -223,6 +224,7 @@ async function flash() {
     'firmwares/us_v2_19.bin',  // Ver 2.19
     'firmwares/us_v2_20.bin',  // Ver 2.20
     'firmwares/us_v2_21.bin',  // Ver 2.21
+    'firmwares/us_v2_22.bin',  // Ver 2.22
   ];
   const progressWrite = document.getElementById('progress_write');
   const progressVerify = document.getElementById('progress_verify');
@@ -275,7 +277,8 @@ async function flash() {
 <option>Ver 2.18</option>
 <option>Ver 2.19</option>
 <option>Ver 2.20</option>
-<option selected>Ver 2.21</option>
+<option>Ver 2.21</option>
+<option selected>Ver 2.22</option>
 </select>
 <button onclick="flash();">書き込み</button>
 
diff --git a/docs/firmware_en.md b/docs/firmware_en.md
index 8c38f25..d8a960d 100644
--- a/docs/firmware_en.md
+++ b/docs/firmware_en.md
@@ -146,6 +146,7 @@ It may be ok if it does not long, but it may damage the device to connect over J
 - Ver 2.19 Support Real Arcade Pro.N HAYABUSA, V3.SA later model, and adjust bus RESET again.
 - Ver 2.20 Support GT Force Pro, and introduce experimental shift gear emulation.
 - Ver 2.21 Bug fix to run rapid-fires at correct speed even in JVS Dash mode.
+- Ver 2.22 Support analog polarity in the settings.
 
 ## Firmware Compatibility
 For v3 based PCBs, only v1.48 and v2.11+ work. For v1/v2 based PCBs, all firmwares work.
@@ -229,6 +230,7 @@ async function flash() {
     'firmwares/us_v2_19.bin',  // Ver 2.19
     'firmwares/us_v2_20.bin',  // Ver 2.20
     'firmwares/us_v2_21.bin',  // Ver 2.21
+    'firmwares/us_v2_22.bin',  // Ver 2.22
   ];
   const progressWrite = document.getElementById('progress_write');
   const progressVerify = document.getElementById('progress_verify');
@@ -281,7 +283,8 @@ async function flash() {
 <option>Ver 2.18</option>
 <option>Ver 2.19</option>
 <option>Ver 2.20</option>
-<option selected>Ver 2.21</option>
+<option>Ver 2.21</option>
+<option selected>Ver 2.22</option>
 </select>
 <button onclick="flash();">Flash</button>
 
diff --git a/docs/firmwares/us_v2_22.bin b/docs/firmwares/us_v2_22.bin
new file mode 100644
index 0000000..82cdff8
Binary files /dev/null and b/docs/firmwares/us_v2_22.bin differ