diff --git a/homeassistant/components/ads/__init__.py b/homeassistant/components/ads/__init__.py
index 15d58eb4620..b17a066eba7 100644
--- a/homeassistant/components/ads/__init__.py
+++ b/homeassistant/components/ads/__init__.py
@@ -230,7 +230,13 @@ class AdsHub:
 
         hnotify = int(contents.hNotification)
         _LOGGER.debug("Received notification %d", hnotify)
-        data = contents.data
+
+        # get dynamically sized data array
+        data_size = contents.cbSampleSize
+        data = (ctypes.c_ubyte * data_size).from_address(
+            ctypes.addressof(contents)
+            + pyads.structs.SAdsNotificationHeader.data.offset
+        )
 
         try:
             with self._lock:
@@ -241,17 +247,17 @@ class AdsHub:
 
         # Parse data to desired datatype
         if notification_item.plc_datatype == self.PLCTYPE_BOOL:
-            value = bool(struct.unpack("<?", bytearray(data)[:1])[0])
+            value = bool(struct.unpack("<?", bytearray(data))[0])
         elif notification_item.plc_datatype == self.PLCTYPE_INT:
-            value = struct.unpack("<h", bytearray(data)[:2])[0]
+            value = struct.unpack("<h", bytearray(data))[0]
         elif notification_item.plc_datatype == self.PLCTYPE_BYTE:
-            value = struct.unpack("<B", bytearray(data)[:1])[0]
+            value = struct.unpack("<B", bytearray(data))[0]
         elif notification_item.plc_datatype == self.PLCTYPE_UINT:
-            value = struct.unpack("<H", bytearray(data)[:2])[0]
+            value = struct.unpack("<H", bytearray(data))[0]
         elif notification_item.plc_datatype == self.PLCTYPE_DINT:
-            value = struct.unpack("<i", bytearray(data)[:4])[0]
+            value = struct.unpack("<i", bytearray(data))[0]
         elif notification_item.plc_datatype == self.PLCTYPE_UDINT:
-            value = struct.unpack("<I", bytearray(data)[:4])[0]
+            value = struct.unpack("<I", bytearray(data))[0]
         else:
             value = bytearray(data)
             _LOGGER.warning("No callback available for this datatype")
diff --git a/homeassistant/components/ads/manifest.json b/homeassistant/components/ads/manifest.json
index 374d29140ea..5da1b79b424 100644
--- a/homeassistant/components/ads/manifest.json
+++ b/homeassistant/components/ads/manifest.json
@@ -2,6 +2,6 @@
   "domain": "ads",
   "name": "ADS",
   "documentation": "https://www.home-assistant.io/integrations/ads",
-  "requirements": ["pyads==3.1.3"],
+  "requirements": ["pyads==3.2.1"],
   "codeowners": []
 }
diff --git a/requirements_all.txt b/requirements_all.txt
index 6bc23c3577a..7b361179e3d 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1202,7 +1202,7 @@ py_nextbusnext==0.1.4
 # py_noaa==0.3.0
 
 # homeassistant.components.ads
-pyads==3.1.3
+pyads==3.2.1
 
 # homeassistant.components.hisense_aehw4a1
 pyaehw4a1==0.3.5