diff --git a/build-constraints.yaml b/build-constraints.yaml
index e8867da7..c0e84bb4 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3634,6 +3634,7 @@ packages:
         - pvar
         - conduit-aeson
         - vector-stream
+        - FailT
 
     "Hans-Peter Deifel <hpd@hpdeifel.de> @hpdeifel":
         - hledger-iadd < 0 # 1.3.17 has brick < 0.72