diff --git a/setup.py b/setup.py
index fefae7df8bd4a80897882001781886d5c7734bd5..beb8920e9e4c93bd957c459e09222094e4dfd032 100755
--- a/setup.py
+++ b/setup.py
@@ -13,6 +13,7 @@ setup(
     install_requires=[
         'babel>=2.6',  # Debian:python3-babel
         'beancount>=2.2',  # Debian:beancount
+        'GitPython>=2.0',  # Debian:python3-git
         # 1.4.1 crashes when trying to save some documents.
         'odfpy>=1.4.0,!=1.4.1',  # Debian:python3-odf
         'PyYAML>=3.0',  # Debian:python3-yaml