diff --git a/Dockerfile b/Dockerfile
index 605fdbee4ec..48c57ff5d6a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.8@sha256:e87caa74dcb7d46cd820352bfea12591f3dba3ddc4285e19c7dcd13359f7cefd
+# syntax=docker/dockerfile:1.9@sha256:fe40cf4e92cd0c467be2cfc30657a680ae2398318afd50b0c80585784c604f28
 
 # Note: This file must be kept in sync in ./Dockerfile and ./docker/ubuntu/Dockerfile.
 #       Changes to this file must be copied over to the other file.
diff --git a/docker/ubuntu/Dockerfile b/docker/ubuntu/Dockerfile
index 605fdbee4ec..48c57ff5d6a 100644
--- a/docker/ubuntu/Dockerfile
+++ b/docker/ubuntu/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.8@sha256:e87caa74dcb7d46cd820352bfea12591f3dba3ddc4285e19c7dcd13359f7cefd
+# syntax=docker/dockerfile:1.9@sha256:fe40cf4e92cd0c467be2cfc30657a680ae2398318afd50b0c80585784c604f28
 
 # Note: This file must be kept in sync in ./Dockerfile and ./docker/ubuntu/Dockerfile.
 #       Changes to this file must be copied over to the other file.