diff --git a/IPython/core/completer.py b/IPython/core/completer.py
index bc114f0f66b..374a35d7aed 100644
--- a/IPython/core/completer.py
+++ b/IPython/core/completer.py
@@ -988,7 +988,8 @@ def _make_signature(completion)-> str:
 
     """
 
-    return '(%s)'% ', '.join([f for f in (_formatparamchildren(p) for p in completion.params) if f])
+    return '(%s)'% ', '.join([f for f in (_formatparamchildren(p) for signature in completion.get_signatures()
+                                          for p in signature.defined_names()) if f])
 
 class IPCompleter(Completer):
     """Extension of the completer class with IPython-specific features"""
@@ -1398,7 +1399,7 @@ def _jedi_matches(self, cursor_column:int, cursor_line:int, text:str):
         if not try_jedi:
             return []
         try:
-            return filter(completion_filter, interpreter.completions())
+            return filter(completion_filter, interpreter.complete())
         except Exception as e:
             if self.debug:
                 return [_FakeJediCompletion('Oops Jedi has crashed, please report a bug with the following:\n"""\n%s\ns"""' % (e))]
diff --git a/setup.py b/setup.py
index daf5f55f000..c40f756b219 100755
--- a/setup.py
+++ b/setup.py
@@ -185,14 +185,14 @@
 )
 
 install_requires = [
-    'setuptools>=18.5',
-    'jedi>=0.10',
-    'decorator',
-    'pickleshare',
-    'traitlets>=4.2',
-    'prompt_toolkit>=2.0.0,<3.1.0,!=3.0.0,!=3.0.1',
-    'pygments',
-    'backcall',
+    "setuptools>=18.5",
+    "jedi>=0.16",
+    "decorator",
+    "pickleshare",
+    "traitlets>=4.2",
+    "prompt_toolkit>=2.0.0,<3.1.0,!=3.0.0,!=3.0.1",
+    "pygments",
+    "backcall",
 ]
 
 # Platform-specific dependencies: