diff --git a/box.cabal b/box.cabal
--- a/box.cabal
+++ b/box.cabal
@@ -1,6 +1,6 @@
 cabal-version:  2.4
 name:           box
-version:        0.6.1
+version:        0.6.2
 synopsis:       boxes
 description:    concurrent, effectful boxes
 category:       project
@@ -140,14 +140,9 @@
     numhask >= 0.7 && < 0.8,
   default-language: Haskell2010
   default-extensions:
-    NegativeLiterals
-    NoImplicitPrelude
-    OverloadedStrings
-    UnicodeSyntax
   ghc-options:
     -Wall
     -Wcompat
     -Wincomplete-record-updates
     -Wincomplete-uni-patterns
     -Wredundant-constraints
-    -funbox-strict-fields