diff --git a/gitlab/cli.py b/gitlab/cli.py
index f06f49d94..35e580221 100644
--- a/gitlab/cli.py
+++ b/gitlab/cli.py
@@ -79,6 +79,7 @@ def wrapped_f(*args: Any, **kwargs: Any) -> Any:
             action = custom_action or f.__name__.replace("_", "-")
             custom_actions[final_name][action] = (mandatory, optional, in_obj)
 
+        wrapped_f._custom_args = mandatory + optional
         return cast(__F, wrapped_f)
 
     return wrap
diff --git a/gitlab/v4/objects/merge_requests.py b/gitlab/v4/objects/merge_requests.py
index edd7d0195..0493c5835 100644
--- a/gitlab/v4/objects/merge_requests.py
+++ b/gitlab/v4/objects/merge_requests.py
@@ -350,18 +350,15 @@ def merge_ref(self, **kwargs: Any) -> Union[Dict[str, Any], requests.Response]:
         (),
         (
             "merge_commit_message",
-            "should_remove_source_branch",
             "merge_when_pipeline_succeeds",
+            "sha",
+            "should_remove_source_branch",
+            "squash_commit_message",
+            "squash",
         ),
     )
     @exc.on_http_error(exc.GitlabMRClosedError)
-    def merge(
-        self,
-        merge_commit_message: Optional[str] = None,
-        should_remove_source_branch: Optional[bool] = None,
-        merge_when_pipeline_succeeds: Optional[bool] = None,
-        **kwargs: Any,
-    ) -> Dict[str, Any]:
+    def merge(self, **kwargs: Any) -> Dict[str, Any]:
         """Accept the merge request.
 
         Args:
@@ -377,15 +374,14 @@ def merge(
             GitlabMRClosedError: If the merge failed
         """
         path = f"{self.manager.path}/{self.encoded_id}/merge"
-        data: Dict[str, Any] = {}
-        if merge_commit_message:
-            data["merge_commit_message"] = merge_commit_message
-        if should_remove_source_branch is not None:
-            data["should_remove_source_branch"] = should_remove_source_branch
-        if merge_when_pipeline_succeeds is not None:
-            data["merge_when_pipeline_succeeds"] = merge_when_pipeline_succeeds
-
-        server_data = self.manager.gitlab.http_put(path, post_data=data, **kwargs)
+        post_data: Dict[str, Any] = {}
+        data = kwargs.copy()
+
+        for key in kwargs.keys():
+            if key in self.merge._custom_args:
+                post_data[key] = data.pop(key)
+
+        server_data = self.manager.gitlab.http_put(path, post_data=post_data, **data)
         if TYPE_CHECKING:
             assert isinstance(server_data, dict)
         self._update_attrs(server_data)