diff --git a/build-constraints.yaml b/build-constraints.yaml
index a2e4b29a..f24cc4da 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1985,6 +1985,7 @@ packages:
         - charsetdetect-ae
         - ilist
         - text-all
+        - fmt
 
     "Takano Akio tak@anoak.io @takano-akio":
         - fast-builder