diff --git a/build-constraints.yaml b/build-constraints.yaml
index d8d584ba..de9ee8e2 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -507,7 +507,7 @@ packages:
         - pipes-parse
         - pipes-concurrency
         - pipes-safe
-        # - turtle # BLOCKED optparse-applicative 0.13
+        - turtle
         - foldl
         - morte