diff --git a/docker-compose.yml b/docker-compose.yml
index 8c135ac1e5ceaf0b3732dfa1ae460bfe3ae46754..b1b78517381f30e21f66bd05a7f9ac2d3b0e82d9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,4 @@
-version: "3.9"
+version: "3.3"
 services:
   maxima:
     image: mathinstitut/goemaxima:${STACKMAXIMA_VERSION:-2023010400}-latest