diff --git a/build-constraints.yaml b/build-constraints.yaml
index 263dfcc5..2f22c0ef 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -871,7 +871,7 @@ packages:
         - monadic-arrays
         - monad-products
         - monad-st
-        - mtl
+        # - mtl take the one that ships with GHC
         - nats
         - numeric-extras
         - parsers
@@ -2854,7 +2854,7 @@ packages:
         - xlsx-tabular
 
     "Mikhail Glushenkov <mikhail.glushenkov@gmail.com> @23Skidoo":
-        - Cabal
+        # - Cabal take the one that ships with GHC
         - cabal-install < 0 # via base-4.13.0.0
         # - pointful # haskell-src-exts
 
@@ -4385,7 +4385,6 @@ packages:
         - options
         - optparse-applicative
         - parallel
-        - parsec
         - path-pieces
         - pcg-random
         - persistable-record