diff --git a/Dockerfile b/Dockerfile
index 47d437d..cbdd976 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM acspri/limesurvey:4.4.13
+FROM acspri/limesurvey:4.6.3
 
 # Set up PHP with PostgreSQL PDO support.
 RUN set -o errexit -o nounset -o xtrace; \