diff --git a/build-constraints.yaml b/build-constraints.yaml
index cfa85305..74a618c6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6731,6 +6731,10 @@ packages:
       - hledger-ui < 1.23
       - hledger-web < 1.23
 
+      # https://github.com/commercialhaskell/stackage/issues/6203
+      - skylighting < 0.12
+      - skylighting-core < 0.12
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of