diff --git a/ech-fixture/src/main/resources/ech-fixture/Dockerfile b/ech-fixture/src/main/resources/ech-fixture/Dockerfile
index 8c6f596..0d1f408 100644
--- a/ech-fixture/src/main/resources/ech-fixture/Dockerfile
+++ b/ech-fixture/src/main/resources/ech-fixture/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.26-alpine AS build
+FROM golang:1.27-alpine AS build
 
 WORKDIR /src
 COPY main.go .
diff --git a/test-server/Dockerfile b/test-server/Dockerfile
index 3ed6b37..0c1640f 100644
--- a/test-server/Dockerfile
+++ b/test-server/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.26-alpine AS build
+FROM golang:1.27-alpine AS build
 
 WORKDIR /src
 # The trailing slash is load-bearing. BuildKit accepts a bare `.` for a multi-file COPY, and