diff --git a/build/Dockerfile b/build/Dockerfile
index 6401c04e4c..e150ee7b15 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.19
+# syntax=docker/dockerfile:1.20
 FROM golang:1.25 AS builder
 
 WORKDIR /go/src/github.com/nginx/nginx-gateway-fabric
diff --git a/build/Dockerfile.nginx b/build/Dockerfile.nginx
index fcfd8f94ea..bf34380bc1 100644
--- a/build/Dockerfile.nginx
+++ b/build/Dockerfile.nginx
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.19
+# syntax=docker/dockerfile:1.20
 FROM scratch AS nginx-files
 
 # the following links can be replaced with local files if needed, i.e. ADD --chown=101:1001 <local_file> <container_file>
diff --git a/build/Dockerfile.nginxplus b/build/Dockerfile.nginxplus
index c8ea332231..a76ddce872 100644
--- a/build/Dockerfile.nginxplus
+++ b/build/Dockerfile.nginxplus
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.19
+# syntax=docker/dockerfile:1.20
 FROM scratch AS nginx-files
 
 # the following links can be replaced with local files if needed, i.e. ADD --chown=101:1001 <local_file> <container_file>
diff --git a/build/ubi/Dockerfile b/build/ubi/Dockerfile
index 570e3876bd..4f248a41c1 100644
--- a/build/ubi/Dockerfile
+++ b/build/ubi/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.19
+# syntax=docker/dockerfile:1.20
 FROM golang:1.25 AS builder
 
 WORKDIR /go/src/github.com/nginx/nginx-gateway-fabric
diff --git a/build/ubi/Dockerfile.nginx b/build/ubi/Dockerfile.nginx
index c6870a1dca..2a16c257df 100644
--- a/build/ubi/Dockerfile.nginx
+++ b/build/ubi/Dockerfile.nginx
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.19
+# syntax=docker/dockerfile:1.20
 FROM scratch AS nginx-files
 
 # Repository and key files for UBI-based builds
diff --git a/build/ubi/Dockerfile.nginxplus b/build/ubi/Dockerfile.nginxplus
index 63f79f92d9..2ed3ba9de7 100644
--- a/build/ubi/Dockerfile.nginxplus
+++ b/build/ubi/Dockerfile.nginxplus
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.19
+# syntax=docker/dockerfile:1.20
 FROM scratch AS nginx-files
 
 # NGINX Plus repo and key files (must be provided at build time)
diff --git a/debug/Dockerfile b/debug/Dockerfile
index e360d31306..3b4a3194a3 100644
--- a/debug/Dockerfile
+++ b/debug/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.19
+# syntax=docker/dockerfile:1.20
 # This Dockerfile builds an image with the dlv debugger. See the debugging guide in the developer docs for details
 # on how to use it.
 FROM golang:1.25-alpine AS builder
diff --git a/tests/conformance/Dockerfile b/tests/conformance/Dockerfile
index 70586d6c19..6784e336f1 100644
--- a/tests/conformance/Dockerfile
+++ b/tests/conformance/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.19
+# syntax=docker/dockerfile:1.20
 FROM golang:1.25
 
 WORKDIR /go/src/github.com/nginx/nginx-gateway-fabric/tests/conformance
diff --git a/tests/framework/crossplane/Dockerfile b/tests/framework/crossplane/Dockerfile
index 920169a4bc..69fd4ce175 100644
--- a/tests/framework/crossplane/Dockerfile
+++ b/tests/framework/crossplane/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.19
+# syntax=docker/dockerfile:1.20
 FROM golang:1.25-alpine AS builder
 
 WORKDIR /