diff --git a/optional/radicale/Dockerfile b/optional/radicale/Dockerfile
index 60bdd4bb..30055a14 100644
--- a/optional/radicale/Dockerfile
+++ b/optional/radicale/Dockerfile
@@ -13,7 +13,7 @@ RUN apk add --no-cache \
 
 # Image specific layers under this line
 RUN apk add --no-cache curl \
- && pip3 install radicale~=3.0
+ && pip3 install pytz radicale~=3.0
 
 
 COPY radicale.conf /radicale.conf
@@ -24,4 +24,4 @@ VOLUME ["/data"]
 CMD radicale -S -C /radicale.conf
 
 HEALTHCHECK CMD curl -f -L http://localhost:5232/ || exit 1
-RUN echo $VERSION >> /version
\ No newline at end of file
+RUN echo $VERSION >> /version