diff --git a/build-constraints.yaml b/build-constraints.yaml
index e3c8b53d..a19aedb6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4982,7 +4982,6 @@ packages:
       # To close this, we may need to set flags.QuickCheck.old-random = true unless we've updated to random 1.2
       - QuickCheck < 2.14
       - quickcheck-instances < 0.3.24
-      - splitmix < 0.1
       - binary-instances < 1.0.1
 
       # https://github.com/commercialhaskell/stackage/issues/5349