diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.4.2.1
+
+* Bumped `hashable` upper bound.
+
 # 0.4.2
 
 * New minor release (microlens-0.4.12.0, microlens-ghc-0.4.13).
diff --git a/microlens-platform.cabal b/microlens-platform.cabal
--- a/microlens-platform.cabal
+++ b/microlens-platform.cabal
@@ -1,5 +1,5 @@
 name:                microlens-platform
-version:             0.4.2
+version:             0.4.2.1
 synopsis:            microlens + all batteries included (best for apps)
 description:
   This package exports a module which is the recommended starting point for using <http://hackage.haskell.org/package/microlens microlens> if you aren't trying to keep your dependencies minimal. By importing @Lens.Micro.Platform@ you get all functions and instances from <http://hackage.haskell.org/package/microlens microlens>, <http://hackage.haskell.org/package/microlens-th microlens-th>, <http://hackage.haskell.org/package/microlens-mtl microlens-mtl>, <http://hackage.haskell.org/package/microlens-ghc microlens-ghc>, as well as instances for @Vector@, @Text@, and @HashMap@.
@@ -18,16 +18,17 @@
 extra-source-files:
   CHANGELOG.md
 cabal-version:       >=1.10
-tested-with:         GHC==7.4.2
-                     GHC==7.6.3
+tested-with:         GHC==7.6.3
                      GHC==7.8.4
                      GHC==7.10.3
                      GHC==8.0.2
                      GHC==8.2.2
                      GHC==8.4.4
                      GHC==8.6.5
-                     GHC==8.8.1
-                     GHC==8.10.1
+                     GHC==8.8.4
+                     GHC==8.10.7
+                     GHC==9.0.1
+                     GHC==9.2.1
 
 source-repository head
   type:                git
@@ -39,7 +40,7 @@
   -- other-modules:
   -- other-extensions:
   build-depends:       base >=4.5 && <5
-                     , hashable >=1.1.2.3 && <1.4
+                     , hashable >=1.1.2.3 && <1.5
                      , microlens ==0.4.12.*
                      , microlens-ghc ==0.4.13.*
                      , microlens-mtl ==0.2.0.*