diff --git a/gertty/gitrepo.py b/gertty/gitrepo.py
index 8587fe7..9028c86 100644
--- a/gertty/gitrepo.py
+++ b/gertty/gitrepo.py
@@ -388,7 +388,7 @@ class Repo(object):
             extra_contexts.append(CommitContext(None, newc))
         contexts = itertools.chain(
             extra_contexts, oldc.diff(
-                newc, color='never',create_patch=True, U=context))
+                newc, color='never', create_patch=True, unified=context))
         for diff_context in contexts:
             # Each iteration of this is a file
             f = DiffFile()
diff --git a/requirements.txt b/requirements.txt
index b07b170..848f6fc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ pbr>=0.11,<2.0
 
 urwid>=1.2.1,!=1.3.0
 SQLAlchemy>=1.0.4
-GitPython>=0.3.7,<1.0.2
+GitPython>=0.3.7
 python-dateutil
 requests>=2.5.3,<3.0.0
 ordereddict