diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80d6f6ee6..0dcf420ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 - #559 Improve handling of whitespace in import and from-import statements
 - #581 Remove functions in rope.base.ast that has functionally identical implementation in stdlib's ast 
 - #589 Fix issue with `sample_project()` creating directories where it shouldn't when running tests
+- #566, #567 Fix variables in kwonlyargs and posonlyargs not being correctly passed to extracted methods
 
 # Release 1.5.1
 
diff --git a/rope/refactor/extract.py b/rope/refactor/extract.py
index 47628c75c..3221b1a16 100644
--- a/rope/refactor/extract.py
+++ b/rope/refactor/extract.py
@@ -947,11 +947,14 @@ def _handle_loop_context(self, node):
 
 
 def _get_argnames(arguments):
-    result = [node.arg for node in arguments.args if isinstance(node, ast.arg)]
+    result = []
+    result.extend(node.arg for node in getattr(arguments, "posonlyargs", []))
+    result.extend(node.arg for node in arguments.args)
     if arguments.vararg:
         result.append(arguments.vararg.arg)
     if arguments.kwarg:
         result.append(arguments.kwarg.arg)
+    result.extend(node.arg for node in arguments.kwonlyargs)
     return result
 
 
diff --git a/ropetest/refactor/extracttest.py b/ropetest/refactor/extracttest.py
index 6445c75b4..c03691da2 100644
--- a/ropetest/refactor/extracttest.py
+++ b/ropetest/refactor/extracttest.py
@@ -204,6 +204,43 @@ def new_func():
         """)
         self.assertEqual(expected, refactored)
 
+    def test_extract_function_with_kwonlyargs(self):
+        code = dedent("""\
+            def a_func(b, *, a_var):
+                another_var = 20
+                third_var = a_var + another_var
+        """)
+        start, end = self._convert_line_range_to_offset(code, 3, 3)
+        refactored = self.do_extract_method(code, start, end, "new_func")
+        expected = dedent("""\
+            def a_func(b, *, a_var):
+                another_var = 20
+                new_func(a_var, another_var)
+
+            def new_func(a_var, another_var):
+                third_var = a_var + another_var
+        """)
+        self.assertEqual(expected, refactored)
+
+    @testutils.only_for_versions_higher("3.8")
+    def test_extract_function_with_posonlyargs(self):
+        code = dedent("""\
+            def a_func(a_var, /, b):
+                another_var = 20
+                third_var = a_var + another_var
+        """)
+        start, end = self._convert_line_range_to_offset(code, 3, 3)
+        refactored = self.do_extract_method(code, start, end, "new_func")
+        expected = dedent("""\
+            def a_func(a_var, /, b):
+                another_var = 20
+                new_func(a_var, another_var)
+
+            def new_func(a_var, another_var):
+                third_var = a_var + another_var
+        """)
+        self.assertEqual(expected, refactored)
+
     def test_extract_function_with_multiple_return_values(self):
         code = dedent("""\
             def a_func():