diff --git a/installer/Dockerfile b/installer/Dockerfile
index 150dbb85..1ad1f421 100644
--- a/installer/Dockerfile
+++ b/installer/Dockerfile
@@ -76,8 +76,24 @@ ENV MAXKB_VERSION="${DOCKER_IMAGE_TAG} (build at ${BUILD_AT}, commit: ${GITHUB_C
     PIP_TARGET=/opt/maxkb/python-packages
 
 # Install poppler-utils for PDF processing (required by MinerU)
+# Install X11 libraries for LibreOffice (required for headless operation)
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends poppler-utils && \
+    apt-get install -y --no-install-recommends \
+        poppler-utils \
+        libxinerama1 \
+        libxi6 \
+        libxrender1 \
+        libxtst6 \
+        libxrandr2 \
+        libxext6 \
+        libxfixes3 \
+        libxcursor1 \
+        libxcomposite1 \
+        libxdamage1 \
+        libxss1 \
+        libxt6 \
+        libsm6 \
+        libice6 && \
     apt-get clean all && \
     rm -rf /var/lib/apt/lists/*