diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7f772d11..a2ade4be 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3174,6 +3174,8 @@ packages:
         - proto-lens-arbitrary
         - proto-lens-optparse
         - tensorflow-test
+        - pier-core
+        - pier
 
     "Christof Schramm <christof.schramm@campus.lmu.de>":
         - mnist-idx