diff --git a/build-constraints.yaml b/build-constraints.yaml
index 6adc576d..e52984e9 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4538,6 +4538,9 @@ packages:
         - Allure < 0.9
         - LambdaHack < 0.9
 
+        # https://github.com/commercialhaskell/stackage/issues/4479
+        - rio < 0.1.9.0
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of