diff --git a/build-constraints.yaml b/build-constraints.yaml
index 677cf6b9..46952ed7 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2983,7 +2983,6 @@ expected-test-failures:
     - dbmigrations # PostgreSQL
     - dns # https://github.com/kazu-yamamoto/dns/issues/29
     - drifter-postgresql # PostgreSQL
-    - ersatz # Requires SAT solver
     - etcd # etcd https://github.com/fpco/stackage/issues/811
     - eventstore # Event Store
     - fb # Facebook app
@@ -3096,8 +3095,6 @@ expected-test-failures:
 
     - hackernews # https://github.com/dmjio/hackernews/issues/19
 
-    - heist # https://github.com/snapframework/heist/issues/95
-
     - language-lua2 # https://github.com/mitchellwrosen/language-lua2/issues/4
 
     - commutative # https://github.com/athanclark/commutative/issues/4