diff --git a/Dockerfile b/Dockerfile
index 49125f8..dd045e7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,20 @@
 # Stage 1: Build the application using SBT
-FROM hseeberger/sbt:8u222-2.11.12-0.13.18 as builder
+# We use a stable OpenJDK 8 base and install the specific SBT version needed,
+# as public SBT images for older versions can be unreliable.
+FROM openjdk:8-jdk-slim as builder
+
+# SBT version from project/build.properties
+ARG SBT_VERSION=0.13.11
+ENV SBT_HOME=/usr/local/sbt
+ENV PATH=${SBT_HOME}/bin:${PATH}
+
+# Install required tools and the specific version of SBT
+RUN apt-get update && \
+    apt-get install -y curl && \
+    curl -L -o sbt.tgz https://github.com/sbt/sbt/releases/download/v${SBT_VERSION}/sbt-${SBT_VERSION}.tgz && \
+    tar -xzf sbt.tgz -C /usr/local && \
+    rm sbt.tgz && \
+    apt-get purge -y --auto-remove curl
 
 WORKDIR /app