diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7917cf0c..b6f4beca 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -54,7 +54,7 @@ packages:
         - configurator-pg < 0 # via base-4.13.0.0
 
     "Sandy Maguire <sandy@sandymaguire.me> @isovector":
-        - polysemy < 0 # via loopbreaker
+        - polysemy
         - polysemy-plugin
         - polysemy-zoo
         - ecstasy
@@ -4594,7 +4594,6 @@ packages:
         - loc < 0 # via base-4.13.0.0
         - locators < 0 # via cryptohash
         - logger-thread < 0 # via protolude
-        - loopbreaker < 0 # via ghc-8.8.1
         - lsp-test < 0 # via conduit-parse
         - lsp-test < 0 # via haskell-lsp
         - machines-binary < 0 # via machines-0.7
@@ -4814,7 +4813,6 @@ packages:
         - tz < 0 # via time-1.9.3
         - ucam-webauth < 0 # via base-4.13.0.0
         - ucam-webauth-types < 0 # via base-4.13.0.0
-        - unagi-chan < 0 # via base-4.13.0.0
         - unbound-generics < 0 # MonadFail
         - union < 0 # via base-4.13.0.0
         - universe-dependent-sum < 0 # via some
@@ -5563,6 +5561,7 @@ expected-test-failures:
     - bv-little # https://github.com/commercialhaskell/stackage/issues/4544
     - hpack # https://github.com/commercialhaskell/stackage/issues/4512
     - kawhi # https://github.com/commercialhaskell/stackage/issues/4512
+    - loopbreaker # https://github.com/polysemy-research/loopbreaker/issues/10
 
     # Compilation failures
     - ListLike # No issue tracker, e-mail sent to maintainer