diff --git a/.gitignore b/.gitignore
index ca8768ed..0767a50d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 /development_tests/
 /data/energy_systems/heat_pumps/*.csv
 /data/energy_systems/heat_pumps/*.insel
+unittests/__pycache__