diff --git a/IPython/core/completer.py b/IPython/core/completer.py
index fce43f0..4a0dc69 100644
--- a/IPython/core/completer.py
+++ b/IPython/core/completer.py
@@ -1350,11 +1350,11 @@ class IPCompleter(Completer):
 
         try:
             # should we check the type of the node is Error ?
-            from jedi.parser.tree import ErrorLeaf
+            from parso.tree import ErrorLeaf
             next_to_last_tree = interpreter._get_module().tree_node.children[-2]
             completing_string = False
             if isinstance(next_to_last_tree, ErrorLeaf):
-                completing_string = interpreter._get_module().tree_node.children[-2].value[0] in {'"', "'"}
+                completing_string = next_to_last_tree.value[0] in {'"', "'"}
             # if we are in a string jedi is likely not the right candidate for
             # now. Skip it.
             try_jedi = not completing_string
diff --git a/setup.py b/setup.py
index abec89d..49d0d7b 100755
--- a/setup.py
+++ b/setup.py
@@ -40,7 +40,7 @@ if sys.version_info < (3, 3):
     except Exception:
         pass
 
-        
+
     error = """
 IPython 6.0+ does not support Python 2.6, 2.7, 3.0, 3.1, or 3.2.
 When using Python 2.7, please install IPython 5.x LTS Long Term Support version.
@@ -185,7 +185,7 @@ extras_require = dict(
 
 install_requires = [
     'setuptools>=18.5',
-    'jedi>=0.10',
+    'jedi>=0.11',
     'decorator',
     'pickleshare',
     'simplegeneric>0.8',