diff --git a/build-constraints.yaml b/build-constraints.yaml
index 6bed85e70..249387547 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3761,6 +3761,8 @@ packages:
         - conduit-aeson
         - vector-stream
         - FailT
+        - mempack
+        - ImpSpec
 
     "Hans-Peter Deifel <hpd@hpdeifel.de> @hpdeifel":
         - hledger-iadd
@@ -8199,7 +8201,6 @@ skipped-tests:
     - nothunks
     - optparse-applicative # via QuickCheck
     - primitive
-    - random
     - scientific
     - split
     - splitmix
@@ -8489,7 +8490,6 @@ skipped-tests:
     - safe-coloured-text-layout-gen # tried safe-coloured-text-layout-gen-0.0.0.1, but its *test-suite* requires the disabled package: sydtest-discover
     - salak-toml # tried salak-toml-0.3.5.3, but its *test-suite* requires QuickCheck < 2.14 and the snapshot contains QuickCheck-2.15.0.1
     - scalendar # tried scalendar-1.2.0, but its *test-suite* requires the disabled package: SCalendar
-    - scheduler # tried scheduler-2.0.0.1, but its *test-suite* requires QuickCheck < 2.15 and the snapshot contains QuickCheck-2.15.0.1
     - selective # tried selective-0.7.0.1, but its *test-suite* requires QuickCheck >=2.8 && < 2.15 and the snapshot contains QuickCheck-2.15.0.1
     - serialise # tried serialise-0.2.6.1, but its *test-suite* requires base >=4.11 && < 4.20 and the snapshot contains base-4.20.0.0
     - serialise # tried serialise-0.2.6.1, but its *test-suite* requires tasty-quickcheck >=0.8 && < 0.11 and the snapshot contains tasty-quickcheck-0.11.1
@@ -8630,7 +8630,6 @@ expected-test-failures:
     - parameterized # 0.5.0.0 https://github.com/commercialhaskell/stackage/issues/5746
     - protobuf # 0.2.1.4
     - record-wrangler # 0.1.1.0
-    - scheduler # 2.0.0.1 https://github.com/lehins/scheduler/issues/11
     - secp256k1-haskell # #5948/closed
     - servant-static-th # 1.0.0.1 https://github.com/cdepillabout/servant-static-th/issues/21
     - snappy # Could not find module ‘Functions’