diff --git a/build-constraints.yaml b/build-constraints.yaml
index 916ec56a..e8c18040 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1593,7 +1593,7 @@ packages:
         - hasql-pool
         - hasql-th < 0 # 0.4.0.9 TH compile error
         - hasql-transaction
-        - headed-megaparsec
+        - headed-megaparsec < 0.2.0.2 # https://github.com/commercialhaskell/stackage/issues/6348
         - jsonifier
         - list-t
         - mtl-prelude
@@ -1604,7 +1604,7 @@ packages:
         - postgresql-syntax
         - primitive-extras
         - ptr-poker
-        - rebase
+        - rebase < 1.14 # https://github.com/commercialhaskell/stackage/issues/6348
         - rerebase
         - slave-thread
         - stm-containers
@@ -1613,7 +1613,7 @@ packages:
         - text-builder
         - th-lego
         - vector-builder
-        - yaml-unscrambler
+        - yaml-unscrambler < 0.1.0.5 # https://github.com/commercialhaskell/stackage/issues/6348
         - xml-parser
 
     "Iustin Pop <iustin@k1024.org> @iustin":