diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7354a140..3411f5aa 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2958,6 +2958,9 @@ packages:
         # https://github.com/fpco/stackage/issues/2400
         - hslua < 0.5
 
+        # https://github.com/seagreen/hjsonschema/issues/48
+        - hjsonschema < 1.6
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of