diff --git a/Dockerfile b/Dockerfile
index 8fd4cd0..580689f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,6 +11,7 @@ pip3 install \
         urllib3==1.26.12 \
     influxdb-client==1.34.0 reactivex==4.0.4 \
     paho-mqtt==1.6.1 \
+    pypng==0.20220715.0 \
     typing_extensions==4.4.0 \
     yagrc==1.1.1 grpcio-reflection==1.50.0 protobuf==4.21.9