diff --git a/build-constraints.yaml b/build-constraints.yaml
index 2b08d60d..7968a980 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2555,6 +2555,14 @@ packages:
         - hspec < 2.2.4
         - hspec-core < 2.2.4
         - hspec-discover < 2.2.4
+
+        # https://github.com/fpco/stackage/issues/1906
+        - servant < 0.9
+        - servant-client < 0.9
+        - servant-foreign < 0.9
+        - servant-server < 0.9
+        - servant-docs < 0.9
+        - servant-js < 0.9
 # end of packages