diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.1.0.4
+
+- Support `aeson-2.1.x`.
+
 # 0.1.0.3
 
 - Support `text-2.0.x`.
diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 BSD 3-Clause License
 
-Copyright (c) 2021, Jasper Woudenberg
+Copyright (c) 2022, Jasper Woudenberg
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/wai-feature-flags.cabal b/wai-feature-flags.cabal
--- a/wai-feature-flags.cabal
+++ b/wai-feature-flags.cabal
@@ -1,13 +1,13 @@
 cabal-version: 1.18
 
--- This file has been generated from package.yaml by hpack version 0.33.0.
+-- This file has been generated from package.yaml by hpack version 0.34.7.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 481a3fa51fe3b3d0c62f2830ce9118f0100126ba29b6b71667b470a985484e3e
+-- hash: f662828506c4b55e1864e8158cf68568563657f07811553584b31cf57382967f
 
 name:           wai-feature-flags
-version:        0.1.0.3
+version:        0.1.0.4
 synopsis:       Feature flag support for WAI applications.
 description:    Please see the README at <https://github.com/jwoudenberg/wai-feature-flags>.
 category:       Web
@@ -15,7 +15,7 @@
 bug-reports:    https://github.com/jwoudenberg/wai-feature-flags/issues
 author:         Jasper Woudenberg
 maintainer:     mail@jasperwoudenberg.com
-copyright:      2021 Jasper Woudenberg
+copyright:      2022 Jasper Woudenberg
 license:        BSD3
 license-file:   LICENSE
 build-type:     Simple
@@ -37,7 +37,7 @@
   hs-source-dirs:
       src
   build-depends:
-      aeson >=1.2.4.0 && <2.1
+      aeson >=1.2.4.0 && <2.2
     , base >=4.10.1.0 && <5
     , bytestring >=0.10.8.2 && <0.12
     , splitmix >=0.0.3 && <0.2