diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Revision history for deep-transformations
 
+## 0.2.1.1 -- 2023-04-02
+
+* Bumped the upper bound of the `rank2classes` dependency
+
 ## 0.2.1 -- 2023-01-07
 
 * Added AG.Dimorphic
diff --git a/deep-transformations.cabal b/deep-transformations.cabal
--- a/deep-transformations.cabal
+++ b/deep-transformations.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                deep-transformations
-version:             0.2.1
+version:             0.2.1.1
 synopsis:            Deep natural and unnatural tree transformations, including attribute grammars
 description:
 
@@ -43,7 +43,7 @@
                         Transformation.AG, Transformation.AG.Generics,
                         Transformation.AG.Monomorphic, Transformation.AG.Dimorphic
   ghc-options:         -Wall
-  build-depends:        base >= 4.11 && < 5, rank2classes >= 1.4.1 && < 1.5,
+  build-depends:        base >= 4.11 && < 5, rank2classes >= 1.4.1 && < 1.6,
                         transformers >= 0.5 && < 0.7,
                         template-haskell >= 2.11 && < 2.20, generic-lens >= 1.2 && < 2.3
   default-language:     Haskell2010