diff --git a/docker/Dockerfile b/docker/Dockerfile
index 97c196f..eb2ae6b 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -8,7 +8,7 @@
 # RUN:
 #   docker run -e VMPOOLER_CONFIG -p 80:4567 -it vmpooler
 
-FROM jruby:9.2-jdk
+FROM jruby:9.2.9-jdk
 
 ARG vmpooler_version=0.5.0
 
diff --git a/docker/Dockerfile-aio b/docker/Dockerfile-aio
index 7988cb3..40f2318 100644
--- a/docker/Dockerfile-aio
+++ b/docker/Dockerfile-aio
@@ -8,7 +8,7 @@
 # RUN:
 #   docker run -e VMPOOLER_CONFIG -p 80:4567 -it vmpooler
 
-FROM jruby:9.2-jdk
+FROM jruby:9.2.9-jdk
 
 RUN mkdir -p /var/lib/vmpooler
 
diff --git a/docker/Dockerfile_local b/docker/Dockerfile_local
index 7a47516..0f6ed55 100644
--- a/docker/Dockerfile_local
+++ b/docker/Dockerfile_local
@@ -8,7 +8,7 @@
 # RUN:
 #   docker run -e VMPOOLER_CONFIG -p 80:4567 -it vmpooler
 
-FROM jruby:9.2-jdk
+FROM jruby:9.2.9-jdk
 
 COPY docker/docker-entrypoint.sh /usr/local/bin/
 COPY ./ ./