diff --git a/src/proxy-service/Dockerfile b/src/proxy-service/Dockerfile
index c6e5aa23..19500503 100644
--- a/src/proxy-service/Dockerfile
+++ b/src/proxy-service/Dockerfile
@@ -1,8 +1,8 @@
-FROM gradle:jdk8 as builder
+FROM openjdk:8u111-jdk-alpine as builder
 
-COPY --chown=gradle:gradle . /home/gradle/src
+COPY . /home/gradle/src
 WORKDIR /home/gradle/src
-RUN gradle build
+RUN ./gradlew build
 RUN ls build/libs/
 
 # force JDK < 8u121 to provoke CVE-2021-44228 10.0 RCE in log4j < 2.4.1