diff --git a/build-constraints.yaml b/build-constraints.yaml
index f710e03a..e4557297 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3817,7 +3817,6 @@ packages:
         - czipwith < 0
         - darcs < 0
         - data-tree-print < 0
-        - datadog < 0
         - datasets < 0
         - dawg-ord < 0
         - deferred-folds < 0
@@ -4618,6 +4617,7 @@ skipped-tests:
     - path # via genvalidity genvalidity-property
     - system-fileio # ansi-terminal-0.8 via chell
     - system-filepath # ansi-terminal-0.8 via chell
+    - buffer-builder # per HTF per cpphs per polyparse (ghc 8.6 failure)
 
     # Blocked by stackage upper bounds. These can be re-enabled once
     # the relevant stackage upper bound is lifted.