diff --git a/build-constraints.yaml b/build-constraints.yaml
index fa3aa265..5d45c65a 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3320,7 +3320,6 @@ packages:
         - hspec-webdriver < 0 # https://bitbucket.org/wuzzeb/webdriver-utils/issues/9/hspec-webdriver-build-failure-with-ghc-84
         - inline-c < 0 # build failure with GHC 8.4 https://github.com/fpco/inline-c/issues/73
         - json-builder < 0 # build failure with GHC 8.4 https://github.com/lpsmith/json-builder/issues/2
-        - list-t < 0 # build failure with GHC 8.4 # https://github.com/nikita-volkov/list-t/issues/12
         - n-tuple < 0 # build failure with GHC 8.4 https://github.com/athanclark/n-tuple/issues/1
         - pagerduty < 0 # build failure with GHC 8.4 https://github.com/brendanhay/pagerduty/issues/10
         - rainbow < 0 # build failure with GHC 8.4 https://github.com/massysett/rainbow/issues/6
@@ -3407,7 +3406,6 @@ packages:
         # round 2:
         - bookkeeping < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - cartel < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
-        - cases < 0 # DependencyFailed (PackageName "loch-th")
         - clay < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - doctest-discover < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - dynamic-state < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
@@ -3420,7 +3418,6 @@ packages:
         - hdevtools < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - hformat < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - ini < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
-        - loch-th < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - ochintin-daicho < 0 # DependencyFailed (PackageName "bookkeeping")
         - pred-set < 0 # DependencyFailed (PackageName "HSet")
         - simple-log < 0 # DependencyFailed (PackageName "hformat")
@@ -3532,8 +3529,6 @@ packages:
         - liboath-hs < 0 # GHC 8.4 via inline-c
         - hledger-web < 0 # GHC 8.4 via json
         - katydid < 0 # GHC 8.4 via json
-        - slave-thread < 0 # GHC 8.4 via list-t
-        - stm-containers < 0 # GHC 8.4 via list-t
         - timemap < 0 # GHC 8.4 via list-t
         - pred-trie < 0 # GHC 8.4 via pred-set
         - rainbox < 0 # GHC 8.4 via rainbow
@@ -3572,7 +3567,6 @@ packages:
         - jmacro-rpc-snap < 0 # GHC 8.4 via jmacro
         - asciidiagram < 0 # GHC 8.4 via rasterific-svg
         - simple-session < 0 # GHC 8.4 via simple
-        - hedis < 0 # GHC 8.4 via slave-thread
         - distributed-process-monad-control < 0 # GHC 8.4 via distributed-process
         - distributed-process-tests < 0 # GHC 8.4 via distributed-process