diff --git a/build-constraints.yaml b/build-constraints.yaml
index db84be30..d4c80389 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -590,6 +590,7 @@ packages:
         - bytestring-mmap # required by xeno
         - datasets < 0 # via req
         - lucid-extras
+        - mnist-idx-conduit
         - rigel-viz
 
     "Joseph Canero <jmc41493@gmail.com> @caneroj1":