diff --git a/build-constraints.yaml b/build-constraints.yaml
index 493fba66..2814421c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2433,6 +2433,7 @@ packages:
         - pinboard < 0.9.7
         - pandoc < 1.17.2
         - kawhi < 0.1
+        - morte < 1.6.3
 
         # https://github.com/fpco/stackage/issues/1689
         - servant < 0.8