diff --git a/CHANGELOG.md b/CHANGELOG.md
index a61761a..e670631 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 1.50-RC3 (2019/04/06)
+
+* Use python3 for snmp-scan (Issue #25)
+* Add `REAL_IP_FROM` and `REAL_IP_HEADER` environment variables (Issue #22)
+
 ## 1.50-RC2 (2019/04/03)
 
 * MEMORY_LIMIT not used by poller (PR #24)
diff --git a/Dockerfile b/Dockerfile
index fcc4414..2049646 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -103,6 +103,7 @@ RUN mkdir -p /opt \
   && mkdir -p /data ${LIBRENMS_PATH}/config.d /var/log/supervisord \
   && cp ${LIBRENMS_PATH}/config.php.default ${LIBRENMS_PATH}/config.php \
   && cp ${LIBRENMS_PATH}/snmpd.conf.example /etc/snmp/snmpd.conf \
+  && sed -i "1s|.*|#!/usr/bin/env python3|" ${LIBRENMS_PATH}/snmp-scan.py \
   && echo "foreach (glob(\"${DATA_PATH}/config/*.php\") as \$filename) include \$filename;" >> ${LIBRENMS_PATH}/config.php \
   && echo "foreach (glob(\"${LIBRENMS_PATH}/config.d/*.php\") as \$filename) include \$filename;" >> ${LIBRENMS_PATH}/config.php \
   && chown -R librenms. ${DATA_PATH} ${LIBRENMS_PATH} \