diff --git a/build-constraints.yaml b/build-constraints.yaml
index 2bc664f7..18b958f3 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1,6 +1,9 @@
 ghc-major-version: "8.0"
 # Constraints for brand new builds
 packages:
+    "Nobutada Matsubara <t12307043@gunma-u.ac.jp> @matsubara0507":
+        - chatwork
+    
     "Pavol Klacansky <pavol@klacansky.com> @pavolzetor":
         - openexr-write