diff --git a/build-constraints.yaml b/build-constraints.yaml
index f022ec3e..4d062baf 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -864,7 +864,7 @@ packages:
         - lens-action
         - lens-aeson
         - lens-properties
-        - linear
+        - linear < 1.21 # https://github.com/commercialhaskell/stackage/issues/5123
         - linear-accelerate < 0 # GHC 8.4 via accelerate
         - log-domain
         - machines