diff --git a/build-constraints.yaml b/build-constraints.yaml
index c690e745..1928a32c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1802,10 +1802,10 @@ packages:
 
     "Justin Le <justin@jle.im> @mstksg":
         - auto
-        - backprop < 0 # GHC 8.4 via type-combinators
+        - backprop
         - configurator-export
         - hamilton
-        - hmatrix-backprop < 0 # GHC 8.4 via ghc-typelits-knownnat
+        - hmatrix-backprop
         - hmatrix-vector-sized
         - one-liner-instances
         - prompt