diff --git a/message_box_size/config_dialog.py b/message_box_size/config_dialog.py
index 58a07a2..7f5eb24 100644
--- a/message_box_size/config_dialog.py
+++ b/message_box_size/config_dialog.py
@@ -28,6 +28,7 @@ class MessageBoxSizeConfigDialog(SettingsDialog):
 
     def on_setting(self, value, data):
         self.plugin.config[data] = value
+        self.plugin.set_input_height(value)
 
 
 class SizeSpinSetting(SpinSetting):
diff --git a/message_box_size/msg_box_size.py b/message_box_size/msg_box_size.py
index c590cd9..452d289 100644
--- a/message_box_size/msg_box_size.py
+++ b/message_box_size/msg_box_size.py
@@ -1,25 +1,41 @@
+from __future__ import annotations
+
+from typing import cast
+
 from functools import partial
 
+from gajim.gui.message_input import MessageInputTextView
+
 from gajim.plugins import GajimPlugin
 from gajim.plugins.plugins_i18n import _
+
 from message_box_size.config_dialog import MessageBoxSizeConfigDialog
 
 
 class MsgBoxSizePlugin(GajimPlugin):
-    def init(self):
+    def init(self) -> None:
         # pylint: disable=attribute-defined-outside-init
-        self.description = _('Allows you to adjust the height'
-                             ' of the message input.')
+        self.description = _('Allows you to adjust the height '
+                             'of the message input.')
         self.config_dialog = partial(MessageBoxSizeConfigDialog, self)
         self.gui_extension_points = {
-            'chat_control_base': (self._on_connect_chat_control,
-                                  self._on_disconnect_chat_control)
+            'message_input': (self._on_message_input_created, None)
         }
-        self.config_default_values = {'HEIGHT': (20, ''),}
+        self.config_default_values = {
+            'HEIGHT': (20, ''),
+        }
+        self._message_input = None
 
-    def _on_connect_chat_control(self, control):
-        control.msg_textview.set_size_request(-1, self.config['HEIGHT'])
+    def _on_message_input_created(self,
+                                  message_input: MessageInputTextView
+                                  ) -> None:
 
-    @staticmethod
-    def _on_disconnect_chat_control(control):
-        control.msg_textview.set_size_request(-1, -1)
+        self._message_input = message_input
+        self.set_input_height(cast(int, self.config['HEIGHT']))
+
+    def deactivate(self) -> None:
+        self.set_input_height(-1)
+
+    def set_input_height(self, height: int) -> None:
+        assert self._message_input is not None
+        self._message_input.set_size_request(-1, height)
diff --git a/message_box_size/plugin-manifest.json b/message_box_size/plugin-manifest.json
index a4ce12d..b831f19 100644
--- a/message_box_size/plugin-manifest.json
+++ b/message_box_size/plugin-manifest.json
@@ -14,8 +14,8 @@
         "win32"
     ],
     "requirements": [
-        "gajim>=1.4.0"
+        "gajim>=1.5.0"
     ],
     "short_name": "message_box_size",
-    "version": "1.4.1"
+    "version": "1.4.2"
 }
\ No newline at end of file