diff --git a/Dockerfile b/Dockerfile
index 104ea0d..1c38b15 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM python:3.8-slim
 ENV PIP_NO_CACHE_DIR=1 \
     JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64/ \
     PYTHONPATH=/app \
-    SIGNAL_CLI_VERSION=0.8.1
+    SIGNAL_CLI_VERSION=0.9.1
 
 # Install OpenJDK-8
 RUN apt-get update && \