diff --git a/host-agent/Dockerfile.build b/host-agent/Dockerfile.build
index e86334f..29d05d7 100644
--- a/host-agent/Dockerfile.build
+++ b/host-agent/Dockerfile.build
@@ -4,6 +4,12 @@
 FROM python:3.11-slim-bullseye
 
 WORKDIR /build
+
+# PyInstaller braucht objdump aus binutils (im slim-Image nicht enthalten).
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends binutils \
+    && rm -rf /var/lib/apt/lists/*
+
 RUN pip install --no-cache-dir pyinstaller
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt