diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0656a1d3..2e697e95 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6719,6 +6719,9 @@ packages:
       # https://github.com/commercialhaskell/stackage/issues/6195
       - miso < 1.8
 
+      # https://github.com/commercialhaskell/stackage/issues/6196
+      - mcmc < 0.6.1
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of