diff --git a/app/Dockerfile b/app/Dockerfile
index 9e12e8f..6c47ab6 100644
--- a/app/Dockerfile
+++ b/app/Dockerfile
@@ -22,6 +22,7 @@ RUN apk add --no-cache \
 	mailcap \
 	netcat-openbsd \
 	xmlsec-dev \
+	tzdata \
 	&& rm -rf /tmp/*
 
 # Get Mattermost