diff --git a/images.yml b/images.yml
index fd76bc6..d0f1987 100644
--- a/images.yml
+++ b/images.yml
@@ -6,7 +6,7 @@ args:
   OPAM_VERSION: '2.3.0'
   # pass these args albeit they are not used by all Dockerfiles:
   OCAMLFIND_VERSION: '1.9.6'
-  DUNE_VERSION: '3.17.2'
+  DUNE_VERSION: '3.21.0'
   ZARITH_VERSION: '1.14'
   NUM_VERSION: '1.5-1'
 propagate: