diff --git a/README.md b/README.md
index cab2e38e..bb42baf2 100644
--- a/README.md
+++ b/README.md
@@ -184,7 +184,7 @@ The following devices have been tested and confirmed as working. If your device
 
 - **Plugs**: EP10, EP25<sup>\*</sup>, HS100<sup>\*\*</sup>, HS103, HS105, HS110, KP100, KP105, KP115, KP125, KP125M<sup>\*</sup>, KP401
 - **Power Strips**: EP40, EP40M<sup>\*</sup>, HS107, HS300, KP200, KP303, KP400
-- **Wall Switches**: ES20M, HS200, HS210, HS220<sup>\*\*</sup>, KP405, KS200M, KS205<sup>\*</sup>, KS220M, KS225<sup>\*</sup>, KS230, KS240<sup>\*</sup>
+- **Wall Switches**: ES20M, HS200, HS210, HS220<sup>\*\*</sup>, KP405, KS200M, KS205<sup>\*</sup>, KS220, KS220M, KS225<sup>\*</sup>, KS230, KS240<sup>\*</sup>
 - **Bulbs**: KL110, KL120, KL125, KL130, KL135, KL50, KL60, LB110
 - **Light Strips**: KL400L5, KL420L5, KL430
 - **Hubs**: KH100<sup>\*</sup>
diff --git a/SUPPORTED.md b/SUPPORTED.md
index 50e1d3cb..2c854464 100644
--- a/SUPPORTED.md
+++ b/SUPPORTED.md
@@ -97,6 +97,8 @@ Some newer Kasa devices require authentication. These are marked with <sup>*</su
 - **KS205**
   - Hardware: 1.0 (US) / Firmware: 1.0.2<sup>\*</sup>
   - Hardware: 1.0 (US) / Firmware: 1.1.0<sup>\*</sup>
+- **KS220**
+  - Hardware: 1.0 (US) / Firmware: 1.0.13
 - **KS220M**
   - Hardware: 1.0 (US) / Firmware: 1.0.4
 - **KS225**
diff --git a/kasa/tests/device_fixtures.py b/kasa/tests/device_fixtures.py
index d38581a9..1726ee8c 100644
--- a/kasa/tests/device_fixtures.py
+++ b/kasa/tests/device_fixtures.py
@@ -111,7 +111,7 @@ STRIPS_IOT = {"HS107", "HS300", "KP303", "KP200", "KP400", "EP40"}
 STRIPS_SMART = {"P300", "P304M", "TP25", "EP40M"}
 STRIPS = {*STRIPS_IOT, *STRIPS_SMART}
 
-DIMMERS_IOT = {"ES20M", "HS220", "KS220M", "KS230", "KP405"}
+DIMMERS_IOT = {"ES20M", "HS220", "KS220", "KS220M", "KS230", "KP405"}
 DIMMERS_SMART = {"HS220", "KS225", "S500D", "P135"}
 DIMMERS = {
     *DIMMERS_IOT,
diff --git a/kasa/tests/fixtures/KS220(US)_1.0_1.0.13.json b/kasa/tests/fixtures/KS220(US)_1.0_1.0.13.json
new file mode 100644
index 00000000..86ee9d3e
--- /dev/null
+++ b/kasa/tests/fixtures/KS220(US)_1.0_1.0.13.json
@@ -0,0 +1,65 @@
+{
+    "smartlife.iot.dimmer": {
+        "get_dimmer_parameters": {
+            "bulb_type": 1,
+            "calibration_type": 1,
+            "err_code": 0,
+            "fadeOffTime": 1000,
+            "fadeOnTime": 1000,
+            "gentleOffTime": 10000,
+            "gentleOnTime": 3000,
+            "minThreshold": 1,
+            "rampRate": 30
+        }
+    },
+    "system": {
+        "get_sysinfo": {
+            "active_mode": "none",
+            "alias": "#MASKED_NAME#",
+            "brightness": 100,
+            "dev_name": "Smart Wi-Fi Dimmer Switch",
+            "deviceId": "0000000000000000000000000000000000000000",
+            "err_code": 0,
+            "feature": "TIM",
+            "hwId": "00000000000000000000000000000000",
+            "hw_ver": "1.0",
+            "icon_hash": "",
+            "latitude_i": 0,
+            "led_off": 0,
+            "longitude_i": 0,
+            "mac": "30:DE:4B:00:00:00",
+            "mic_type": "IOT.SMARTPLUGSWITCH",
+            "model": "KS220(US)",
+            "next_action": {
+                "type": -1
+            },
+            "ntc_state": 0,
+            "obd_src": "apple",
+            "oemId": "00000000000000000000000000000000",
+            "on_time": 0,
+            "preferred_state": [
+                {
+                    "brightness": 100,
+                    "index": 0
+                },
+                {
+                    "brightness": 75,
+                    "index": 1
+                },
+                {
+                    "brightness": 50,
+                    "index": 2
+                },
+                {
+                    "brightness": 25,
+                    "index": 3
+                }
+            ],
+            "relay_state": 0,
+            "rssi": -47,
+            "status": "configured",
+            "sw_ver": "1.0.13 Build 240424 Rel.102214",
+            "updating": 0
+        }
+    }
+}