diff --git a/tshock/Dockerfile b/tshock/Dockerfile
index c9f2d50..859367b 100644
--- a/tshock/Dockerfile
+++ b/tshock/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.13.5 AS base
+FROM alpine:3.15.0 AS base
 
 # Build arguments
 ARG RELEASE_TAG