diff --git a/Dockerfile b/Dockerfile
index 687b3b0..7af8e4e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,7 +12,7 @@
 # Usage:
 #   Use the provided codebox.sh script to build and run the container easily
 
-FROM ubuntu:24.04
+FROM ubuntu:26.04
 
 # Metadata labels following OCI standards
 LABEL org.opencontainers.image.title="CodeBox: OpenCode Development Container"
@@ -41,6 +41,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     ripgrep \
     less \
     jq \
+    xxd \
     tzdata \
     ${DOCKER_PACKAGES} \
  && rm -rf /var/lib/apt/lists/*
diff --git a/README.md b/README.md
index 8961324..6c0f9f8 100644
--- a/README.md
+++ b/README.md
@@ -121,13 +121,13 @@ codebox --continue
 
 ```bash
 # Update the Docker image to latest OpenCode version
-codebox --upgrade
+codebox --update
 
 # Show help
 codebox -h
 
 # Combined options
-codebox --upgrade --version
+codebox --update --version
 ```
 
 ### Complete Options Reference