diff --git a/Dockerfile.novnc b/Dockerfile.novnc
index 51f02b5..402fbe1 100644
--- a/Dockerfile.novnc
+++ b/Dockerfile.novnc
@@ -2,7 +2,11 @@
 
 WORKDIR /app
 
+ENV DEBIAN_FRONTEND=noninteractive
+ENV TZ=Etc/UTC
+
 RUN apt-get update && apt-get install -y --no-install-recommends \
+    tzdata \
     xvfb \
     fluxbox \
     x11vnc \