diff --git a/update.sh b/update.sh
index 8fbed0adf..e41089ec5 100755
--- a/update.sh
+++ b/update.sh
@@ -115,7 +115,7 @@ function update_node_version() {
     shift
   fi
 
-  fullVersion="$(curl -sSL --compressed "${baseuri}" | grep '<a href="v'"${version}." | sed -E 's!.*<a href="v([^"/]+)/?".*!\1!' | cut -d'.' -f2,3 | sort -V | tail -1)"
+  nodeVersion="$(curl -sSL --compressed "${baseuri}/index.json" | jq -r '[.[] | select(.version | startswith("v'"${version}"'."))] | first | .version | ltrimstr("v")')"
   (
     cp "${template}" "${dockerfile}-tmp"
     local fromprefix=""
@@ -123,8 +123,6 @@ function update_node_version() {
       fromprefix="${arch}\\/"
     fi
 
-    nodeVersion="${version}.${fullVersion:-0}"
-
     sed -Ei -e 's/^FROM (.*)/FROM '"$fromprefix"'\1/' "${dockerfile}-tmp"
     sed -Ei -e 's/^(ENV NODE_VERSION)=.*/\1='"${nodeVersion}"'/' "${dockerfile}-tmp"