diff --git a/Dockerfile b/Dockerfile
index ba00840..b5911e9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,7 +19,7 @@
 #
 ############################################################################
 
-FROM golang:1.20-alpine AS build-env
+FROM golang:1.21-alpine AS build-env
 
 WORKDIR /go/src/tailscale
 
diff --git a/build.sh b/build.sh
index 4ef54b8..5fbe90e 100755
--- a/build.sh
+++ b/build.sh
@@ -25,8 +25,8 @@
 # https://mikrotik.com/products/matrix
 #
 PLATFORM="linux/arm/v7"
-TAILSCALE_VERSION=1.46.1
-VERSION=0.1.20
+TAILSCALE_VERSION=1.48.1
+VERSION=0.1.21
 
 set -eu