diff --git a/backend/Dockerfile b/backend/Dockerfile
index 6862ace..47e866f 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -2,7 +2,7 @@
 # `$BUILDPLATFORM`: the jar is JVM bytecode and the same for every architecture, so the build
 # runs once on the runner's own platform instead of once more under QEMU for arm64. The runtime
 # stage below stays per target, and so does anything built there for the JRE it runs on.
-FROM --platform=$BUILDPLATFORM gradle:9.4.1-jdk25 AS build
+FROM --platform=$BUILDPLATFORM gradle:9.8.2-jdk25 AS build
 WORKDIR /workspace
 COPY settings.gradle.kts build.gradle.kts gradle.properties ./
 COPY gradle ./gradle