diff --git a/Dockerfile b/Dockerfile
index 1a16921..a5f68ca 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.21.0@sha256:27f9262d43452075f3c410287a2c43f5ef1bf7ec2bb06e8c9eeb1b8d453087bc
+# syntax=docker/dockerfile:1.22.0@sha256:4a43a54dd1fedceb30ba47e76cfcf2b47304f4161c0caeac2db1c61804ea3c91
 
 # renovate: datasource=github-releases depName=mathjax packageName=mathjax/MathJax
 ARG MATHJAX_VERSION=4.0.0