diff --git a/README.md b/README.md
index f727317d..9e1633e2 100644
--- a/README.md
+++ b/README.md
@@ -38,9 +38,9 @@ After rebooting Home Assistant, this integration can be configured through the i
 [WillCodeForCats/solaredge-modbus-multi/wiki](https://github.com/WillCodeForCats/solaredge-modbus-multi/wiki)
 
 ### Required Versions
-* Home Assistant 2025.2.0 or newer
+* Home Assistant 2025.7.0 or newer
 * Python 3.11 or newer
-* pymodbus 3.8.3 or newer
+* pymodbus 4.0.0 or newer
 
 ## Specifications
 [WillCodeForCats/solaredge-modbus-multi/tree/main/doc](https://github.com/WillCodeForCats/solaredge-modbus-multi/tree/main/doc)
diff --git a/custom_components/solaredge_modbus_multi/const.py b/custom_components/solaredge_modbus_multi/const.py
index 194c92b0..1e366e97 100644
--- a/custom_components/solaredge_modbus_multi/const.py
+++ b/custom_components/solaredge_modbus_multi/const.py
@@ -10,7 +10,7 @@
 DEFAULT_NAME = "SolarEdge"
 
 # raise a startup exception if pymodbus version is less than this
-PYMODBUS_REQUIRED_VERSION = "3.8.3"
+PYMODBUS_REQUIRED_VERSION = "4.0.0"
 
 # units missing in homeassistant core
 ENERGY_VOLT_AMPERE_HOUR: Final = "VAh"
@@ -42,9 +42,9 @@ class ModbusExceptions:
     IllegalFunction = 0x01
     IllegalAddress = 0x02
     IllegalValue = 0x03
-    SlaveFailure = 0x04
+    DeviceFailure = 0x04
     Acknowledge = 0x05
-    SlaveBusy = 0x06
+    DeviceBusy = 0x06
     NegativeAcknowledge = 0x07
     MemoryParityError = 0x08
     GatewayPathUnavailable = 0x0A
diff --git a/custom_components/solaredge_modbus_multi/hub.py b/custom_components/solaredge_modbus_multi/hub.py
index b1abb706..18f966ad 100644
--- a/custom_components/solaredge_modbus_multi/hub.py
+++ b/custom_components/solaredge_modbus_multi/hub.py
@@ -526,7 +526,7 @@ async def modbus_read_holding_registers(self, unit, address, rcount):
         self._rr_count = rcount
 
         result = await self._client.read_holding_registers(
-            address=self._rr_address, count=self._rr_count, slave=self._rr_unit
+            address=self._rr_address, count=self._rr_count, device_id=self._rr_unit
         )
 
         if result.isError():
@@ -578,7 +578,7 @@ async def write_registers(self, unit: int, address: int, payload) -> None:
                 result = await self._client.write_registers(
                     address=self._wr_address,
                     values=self._wr_payload,
-                    slave=self._wr_unit,
+                    device_id=self._wr_unit,
                 )
 
                 self.has_write = address
diff --git a/custom_components/solaredge_modbus_multi/manifest.json b/custom_components/solaredge_modbus_multi/manifest.json
index 050d1e5a..83a58fe0 100644
--- a/custom_components/solaredge_modbus_multi/manifest.json
+++ b/custom_components/solaredge_modbus_multi/manifest.json
@@ -9,6 +9,6 @@
   "iot_class": "local_polling",
   "issue_tracker": "https://github.com/WillCodeForCats/solaredge-modbus-multi/issues",
   "loggers": ["custom_components.solaredge_modbus_multi"],
-  "requirements": ["pymodbus>=3.8.3"],
+  "requirements": ["pymodbus>=4.0.0"],
   "version": "3.1.4"
 }
diff --git a/hacs.json b/hacs.json
index 95a17fed..40fa45b5 100644
--- a/hacs.json
+++ b/hacs.json
@@ -1,5 +1,5 @@
 {
   "name": "SolarEdge Modbus Multi",
   "content_in_root": false,
-  "homeassistant": "2025.2.0"
+  "homeassistant": "2025.7.0"
 }
diff --git a/requirements.txt b/requirements.txt
index d6716968..42305dee 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-pymodbus>=3.8.3
+pymodbus>=4.0.0