diff --git a/Dockerfile b/Dockerfile
index bed94a6..2693a13 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,7 +19,7 @@ RUN apt-get update && \
     openjdk-17-jdk
 
 # Set Elasticsearch version
-ENV ELASTIC_VERSION=8.17.3
+ENV ELASTIC_VERSION=9.1.5
 ENV JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
 
 # Create elasticsearch user and group
diff --git a/README.md b/README.md
index 086b480..ced604a 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ This package provides Elasticsearch for Cloudron, configured for internal use on
 
 ## Features
 
-- Elasticsearch 8.17.3
+- Elasticsearch 9.1.5
 - Single-node configuration optimized for Cloudron
 - Security enabled with basic authentication
 - Internal access only by default (not publicly exposed)