diff --git a/build-constraints.yaml b/build-constraints.yaml
index fea35ffa..4d111a83 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5506,7 +5506,6 @@ packages:
         - crypto-pubkey < 0 # via crypto-pubkey-types
         - cabal-debian < 0 # via debian
         - xml-isogen < 0 # via dom-parser
-        - scheduler < 0 # via fib
         - cabal2nix < 0 # via hpack
         - postgresql-simple-queue < 0 # via hspec-pg-transact
         - hspec-wai-json < 0 # via hspec-wai
@@ -5620,8 +5619,6 @@ packages:
         - psql-helpers < 0 # via postgresql-simple
         - users-postgresql-simple < 0 # via postgresql-simple
         - protocol-buffers-descriptor < 0 # via protocol-buffers
-        - massiv < 0 # via scheduler
-        - massiv-test < 0 # via scheduler
         - servant-ruby < 0 # via servant-foreign
         - filecache < 0 # via strict-base-types
         - pcre-heavy < 0 # via string-conversions