diff --git a/Dockerfile b/Dockerfile
index c994b82160831debe820cf411e5f25ce1cd6ddba..b11a0fcdea88fcced2a328900df6235916b6cba7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ ARG NEWS_VERSION="16.0.1"
 ARG QUOTA_WARN_VERSION="1.9.1"
 ARG NOTES_VERSION="4.1.1"
 ARG CONTACTS_VERSION="4.0.1"
-ARG CALENDAR_VERSION="2.3.4"
+ARG CALENDAR_VERSION="2.3.3"
 ARG USER_BACKEND_RAW_SQL_VERSION="1.1.0"
 ARG EMAIL_RECOVERY_JOB_ID="199763"
 ARG RAINLOOP_VERSION="7.1.2"
@@ -20,7 +20,7 @@ RUN mkdir -p /var/www/skeleton/Documents && mkdir -p /var/www/skeleton/Images
 COPY patches/ ${TMP_PATCH_DIR}/
 COPY custom_entrypoint.sh /
 RUN chmod +x /custom_entrypoint.sh
-RUN sed -i 's/20,0,12,1/20,0,12,14/' ${BASE_DIR}/version.php
+RUN sed -i 's/20,0,12,1/20,0,12,13/' ${BASE_DIR}/version.php
 
 # Install unzip for unzipping artifacts
 RUN apt-get update && apt-get install unzip