diff --git a/build-constraints.yaml b/build-constraints.yaml
index f1b6b6fc..9a414b5a 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2896,8 +2896,8 @@ packages:
         - aeson-lens
         - arbor-lru-cache
         - arbor-postgres
-        - avro < 0 # via pure-zlib
         - asif
+        - avro
         - bits-extra
         - hw-balancedparens
         - hw-bits
@@ -2926,7 +2926,6 @@ packages:
         - hw-succinct
         - hw-streams
         - hw-xml
-        - pure-zlib < 0 # via base-compat-0.11.0
         - antiope-core
         - antiope-dynamodb < 0 # via antiope-core
         - antiope-messages < 0 # via antiope-core