diff --git a/osmo-gsm-tester/Dockerfile b/osmo-gsm-tester/Dockerfile
index 40e7e1aa..cd42daa0 100644
--- a/osmo-gsm-tester/Dockerfile
+++ b/osmo-gsm-tester/Dockerfile
@@ -20,6 +20,7 @@ RUN	apt-get update && \
 		python3-yaml \
 		python3-mako \
 		python3-gi \
+		python3-numpy \
 		python3-wheel \
 		ofono \
 		patchelf \