diff --git a/opendm/grass/addons/i.cutlinesmod.py b/opendm/grass/addons/i.cutlinesmod.py
index 4ae946fd..bd9f9d46 100755
--- a/opendm/grass/addons/i.cutlinesmod.py
+++ b/opendm/grass/addons/i.cutlinesmod.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 ############################################################################
 #
diff --git a/requirements.txt b/requirements.txt
index 0f7ba7e7..32fd2a95 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ pyodm==1.5.4
 Pillow==6.1.0
 networkx==2.2
 scipy==1.2.1
-numpy==1.15.4
+numpy==1.19.2
 pyproj==2.2.2
 Pysolar==0.6
 psutil==5.6.3