diff --git a/build-constraints.yaml b/build-constraints.yaml
index a8e91051..3eb8dad0 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -25,7 +25,7 @@ packages:
 
     "Pasqualino Assini <tittoassini@gmail.com> @tittoassini":
         - zm
-        # - flat # https://github.com/ndmitchell/derive/issues/25
+        - flat
         - model
 
     "Timo Koepke <timo.koepke@gmail.com> @koepket":
@@ -2318,9 +2318,9 @@ packages:
 
     "Takahiro Himura <himuratk421@gmail.com> @thimura":
         - lens-regex
-        # - twitter-conduit # https://github.com/ndmitchell/derive/issues/25
-        # - twitter-types # https://github.com/ndmitchell/derive/issues/25
-        # - twitter-types-lens # https://github.com/ndmitchell/derive/issues/25
+        - twitter-conduit
+        - twitter-types
+        - twitter-types-lens
 
     # "Robbin C. <robbinch33@gmail.com> robbinch":
         # - zim-parser # via: lzma