diff --git a/magic-wormhole.cabal b/magic-wormhole.cabal
--- a/magic-wormhole.cabal
+++ b/magic-wormhole.cabal
@@ -2,10 +2,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 70e0d0470150c88f241234f7c12f2f2e92a2dcc939f84e6da5db4c8ba17a06a5
+-- hash: c3ace4c817265fed08798ca9d75f3f34218ace8530d9ee3a27378b3ca1a1d844
 
 name:           magic-wormhole
-version:        0.2.0
+version:        0.2.1
 synopsis:       Interact with Magic Wormhole
 description:    Magic Wormhole is a scheme to get things from one computer to another,
                 safely.
@@ -39,7 +39,7 @@
   ghc-options: -Wall -Werror=incomplete-patterns
   build-depends:
       aeson
-    , base ==4.9.*
+    , base >=4.6 && <=4.12
     , bytestring
     , containers
     , cryptonite
@@ -79,7 +79,7 @@
   ghc-options: -Wall -Werror=incomplete-patterns
   build-depends:
       aeson
-    , base ==4.9.*
+    , base >=4.6 && <=4.12
     , magic-wormhole
     , optparse-applicative
     , protolude >=0.2
@@ -96,7 +96,7 @@
   ghc-options: -Wall -Werror=incomplete-patterns
   build-depends:
       aeson
-    , base ==4.9.*
+    , base >=4.6 && <=4.12
     , bytestring
     , hedgehog
     , magic-wormhole