diff --git a/Dockerfile b/Dockerfile
index 4032b63..3b603b7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@
 
 # `docker build --target test` runs the suite in this image.
 # The demo image below does not run it.
-FROM maven:3.9.6-eclipse-temurin-17 AS test
+FROM maven:3.9-eclipse-temurin-26 AS test
 # TrustChainTest runs the install script's trust-chain code: python3, and the
 # openssl CLI it reads certificate names with.
 RUN apt-get update && apt-get install -y --no-install-recommends python3 openssl && rm -rf /var/lib/apt/lists/*
@@ -19,7 +19,7 @@ COPY scripts scripts
 COPY demo/saml.json demo/saml.json
 RUN mvn -B test
 
-FROM maven:3.9.6-eclipse-temurin-17 AS build
+FROM maven:3.9-eclipse-temurin-26 AS build
 WORKDIR /src
 COPY pom.xml .
 COPY library library