diff --git a/build-constraints.yaml b/build-constraints.yaml
index 8830abc1..ee312c9a 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2246,7 +2246,7 @@ packages:
         - string-conv
         - rng-utils
         - rotating-log
-        # - ua-parser # BLOCKED derive
+        - ua-parser
         - hs-GeoIP
         - retry
         # GHC 8 - katip