diff --git a/build-constraints.yaml b/build-constraints.yaml
index 321e9deb..c4abf482 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -986,7 +986,7 @@ packages:
         - monad-extras
         - optparse-simple
         - hpack
-        - stack < 9.9.9
+        # - stack < 9.9.9  # https://github.com/commercialhaskell/stack/issues/3683
 
     "Michael Sloan <mgsloan@gmail.com> @mgsloan":
         - th-orphans
@@ -1696,7 +1696,7 @@ packages:
         - jvm
         - jvm-streaming
         - H
-        - sparkle
+        # - sparkle  # https://github.com/fpco/stackage/pull/3128#issuecomment-353047334
         - th-lift
 
     "Christopher Reichert <creichert07@gmail.com> @creichert":
@@ -2886,7 +2886,7 @@ packages:
         - async-timer
         - nakadi-client
         - throttle-io-stream
-        - conduit-throttle
+        # - conduit-throttle  # https://github.com/mtesseract/conduit-throttle/issues/9
 
     "Simon Hafner <hafnersimon@gmail.com> @reactormonk":
         - uri-bytestring-aeson