diff --git a/build-constraints.yaml b/build-constraints.yaml
index ab85012c..388489cd 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1669,15 +1669,15 @@ packages:
         - bank-holidays-england
 
     "Haskell Servant <haskell-servant-maintainers@googlegroups.com>":
-        - servant
+        - servant < 0.19 # https://github.com/commercialhaskell/stackage/issues/6429
         - servant-blaze
         - servant-cassava
-        - servant-client
-        - servant-client-core
+        - servant-client < 0.19 # https://github.com/commercialhaskell/stackage/issues/6429
+        - servant-client-core < 0.19 # https://github.com/commercialhaskell/stackage/issues/6429
         - servant-conduit
         - servant-docs
         - servant-foreign
-        - servant-http-streams
+        - servant-http-streams < 0.18.4 # https://github.com/commercialhaskell/stackage/issues/6429
         - servant-js
         - servant-lucid
         - servant-machines
@@ -1685,7 +1685,7 @@ packages:
         - servant-multipart
         - servant-multipart-api
         - servant-pipes
-        - servant-server
+        - servant-server < 0.19 # https://github.com/commercialhaskell/stackage/issues/6429
         - servant-swagger
         - servant-swagger-ui
         - servant-swagger-ui-core