diff --git a/setup.py b/setup.py
index <HASH>..<HASH> 100644
--- a/setup.py
+++ b/setup.py
@@ -19,9 +19,10 @@ setup(
     long_description=long_description,
     packages=find_packages('.'),
     install_requires = [
-        'prompt_toolkit==0.57',
-        'jedi>=0.9.0',
         'docopt',
+        'jedi>=0.9.0',
+        'prompt_toolkit==0.57',
+        'pygments',
     ],
     entry_points={
         'console_scripts': [
Added Pygments to the list of dependencies. (This became optional.)