diff --git a/requirements.txt b/requirements.txt
index d0824f83..8db283dd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,6 @@
 # Python pacakges that cannot be installed with pip (e.g. PyQt5, GDAL) are not included.
 # Usage: pip install -r requirements.txt
 numpy>=1.8
-simplejson
 dill
 rtree
 pyopengl