diff --git a/telethon/sessions/abstract.py b/telethon/sessions/abstract.py
index 89f80b7a..dd1541ab 100644
--- a/telethon/sessions/abstract.py
+++ b/telethon/sessions/abstract.py
@@ -100,26 +100,50 @@ class Session(ABC):
     def device_model(self):
         return self._device_model
 
+    @device_model.setter
+    def device_model(self, value):
+        self._device_model = value
+
     @property
     def system_version(self):
         return self._system_version
 
+    @system_version.setter
+    def system_version(self, value):
+        self._system_version = value
+
     @property
     def app_version(self):
         return self._app_version
 
+    @app_version.setter
+    def app_version(self, value):
+        self._app_version = value
+
     @property
     def lang_code(self):
         return self._lang_code
 
+    @lang_code.setter
+    def lang_code(self, value):
+        self._lang_code = value
+
     @property
     def system_lang_code(self):
         return self._system_lang_code
 
+    @system_lang_code.setter
+    def system_lang_code(self, value):
+        self._system_lang_code = value
+
     @property
     def report_errors(self):
         return self._report_errors
 
+    @report_errors.setter
+    def report_errors(self, value):
+        self._report_errors = value
+
     @property
     def time_offset(self):
         return self._time_offset
@@ -132,10 +156,18 @@ class Session(ABC):
     def flood_sleep_threshold(self):
         return self._flood_sleep_threshold
 
+    @flood_sleep_threshold.setter
+    def flood_sleep_threshold(self, value):
+        self._flood_sleep_threshold = value
+
     @property
     def sequence(self):
         return self._sequence
 
+    @sequence.setter
+    def sequence(self, value):
+        self._sequence = value
+
     def get_new_msg_id(self):
         """Generates a new unique message ID based on the current
            time (in ms) since epoch"""
diff --git a/telethon/sessions/memory.py b/telethon/sessions/memory.py
index 92674fa6..71d6e551 100644
--- a/telethon/sessions/memory.py
+++ b/telethon/sessions/memory.py
@@ -66,38 +66,6 @@ class MemorySession(Session):
     def salt(self, value):
         self._salt = value
 
-    @property
-    def device_model(self):
-        return self._device_model
-
-    @property
-    def system_version(self):
-        return self._system_version
-
-    @property
-    def app_version(self):
-        return self._app_version
-
-    @property
-    def lang_code(self):
-        return self._lang_code
-
-    @property
-    def system_lang_code(self):
-        return self._system_lang_code
-
-    @property
-    def report_errors(self):
-        return self._report_errors
-
-    @property
-    def sequence(self):
-        return self._sequence
-
-    @property
-    def flood_sleep_threshold(self):
-        return self._flood_sleep_threshold
-
     def close(self):
         pass