diff --git a/semanticscholar/SemanticScholar.py b/semanticscholar/SemanticScholar.py
index a616893..0fa75e9 100644
--- a/semanticscholar/SemanticScholar.py
+++ b/semanticscholar/SemanticScholar.py
@@ -68,7 +68,6 @@ def timeout(self, timeout: int) -> None:
     def get_paper(
                 self,
                 paper_id: str,
-                include_unknown_refs: bool = False,
                 fields: list = None
             ) -> Paper:
         '''Paper lookup
@@ -101,11 +100,6 @@ def get_paper(
 
         fields = ','.join(fields)
         parameters = f'&fields={fields}'
-        if include_unknown_refs:
-            warnings.warn(
-                'include_unknown_refs parameter is deprecated and will be disabled ' +
-                'in the future', DeprecationWarning)
-            parameters += '&include_unknown_references=true'
 
         data = self._requester.get_data(url, parameters, self.auth_header)
         paper = Paper(data)