diff --git a/dodona-scheme.dockerfile b/dodona-scheme.dockerfile
index 886c018..e45f7aa 100644
--- a/dodona-scheme.dockerfile
+++ b/dodona-scheme.dockerfile
@@ -1,4 +1,4 @@
-FROM racket/racket:8.13
+FROM racket/racket:8.15
 
 # add generic tools
 RUN apt-get --allow-releaseinfo-change update \