diff --git a/build-constraints.yaml b/build-constraints.yaml
index 32c3b566..334c533e 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -34,7 +34,7 @@ packages:
 
     "Manuel Bärenz <programming@manuelbaerenz.de> @turion":
         - dunai
-        - rhine
+        - rhine < 0 # via free-5.1
 
     "Paul Johnson <paul@cogito.org.uk> @PaulJohnson":
         - geodetics
@@ -2887,10 +2887,10 @@ packages:
     "Lennart Spitzner <hexagoxel@hexagoxel.de> @lspitzner":
         - multistate
         - pqueue
-        - butcher
+        - butcher < 0 # via free-5.1
         - czipwith
         - data-tree-print
-        - brittany
+        - brittany < 0 # via butcher
 
     "Ryan Mulligan <ryan@ryantm.com> @ryantm":
         - HDBC-mysql
@@ -3603,9 +3603,6 @@ packages:
         # https://github.com/commercialhaskell/stackage/issues/3787
         - semigroupoids < 5.3
 
-        # https://github.com/commercialhaskell/stackage/issues/3794
-        - free < 5.1
-
         # https://github.com/commercialhaskell/stackage/issues/3808
         - inspection-testing < 0.3