diff --git a/Dockerfile b/Dockerfile
index a7e4ee2..e7e7f07 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,10 @@
-FROM nextcloud
+FROM nextcloud:27
 
 ENV NEXTCLOUD_UPDATE 1
 ENV NEXTCLOUD_ADMIN_USER repod
 ENV NEXTCLOUD_ADMIN_PASSWORD repod
 ENV SQLITE_DATABASE repod
+ARG GPODDERSYNC_VERSION 3.8.1
 
 RUN curl -fsSL https://deb.nodesource.com/setup_16.x | bash - && \
     apt-get install -y nodejs && \
@@ -12,7 +13,7 @@ RUN curl -fsSL https://deb.nodesource.com/setup_16.x | bash - && \
 USER www-data
 
 COPY --chown=www-data:www-data . apps/repod
-RUN curl -sSLo /tmp/gpoddersync.tar.gz https://github.com/thrillfall/nextcloud-gpodder/releases/download/3.8.1/gpoddersync.tar.gz && \
+RUN curl -sSLo /tmp/gpoddersync.tar.gz https://github.com/thrillfall/nextcloud-gpodder/releases/download/${GPODDERSYNC_VERSION}/gpoddersync.tar.gz && \
     tar xvzf /tmp/gpoddersync.tar.gz -C apps && \
     rm /tmp/gpoddersync.tar.gz && \
     cd apps/repod && make build && cd - && \