diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0d22a851..7d0063c7 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -965,7 +965,7 @@ packages:
     "Mario Blazevic <blamario@yahoo.com> @blamario":
         - monad-parallel
         - monad-coroutine
-        - incremental-parser
+        - incremental-parser < 0 # via checkers
         - monoid-subclasses
         - picoparsec < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - rank2classes
@@ -1484,7 +1484,7 @@ packages:
         - ghcjs-perch < 0 # build failure with GHC 8.4
 
     "Tom Ellis <tom-stackage@jaguarpaw.co.uk> @tomjaguarpaw":
-        - opaleye
+        - opaleye < 0 # via checkers
         - product-profunctors
 
     "Samplecount stefan@samplecount.com @kaoskorobase":
@@ -1671,7 +1671,7 @@ packages:
         - getopt-generics
         - graph-wrapper
         - string-conversions
-        - hspec-checkers
+        - hspec-checkers < 0 # via checkers
         - FindBin
 
     "Jan Stolarek <jan.stolarek@p.lodz.pl> @jstolarek":
@@ -4524,7 +4524,7 @@ packages:
         - monads-tf
         - mono-traversable-instances
         - mono-traversable-keys
-        - multiset
+        - multiset < 0 # via checkers
         - mwc-random
         - names-th
         - nanospec