diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.1.2.13] - 2026-06-26
+
+### Changed
+
+- Raised the aeson upper bound to `< 2.4` for aeson 2.3 compatibility.
+
 ## [0.1.2.12] - 2025-02-06
 
 ### Added
diff --git a/om-show.cabal b/om-show.cabal
--- a/om-show.cabal
+++ b/om-show.cabal
@@ -1,6 +1,6 @@
 cabal-version:       3.0
 name:                om-show
-version:             0.1.2.12
+version:             0.1.2.13
 synopsis:            Utilities for showing string-like things.
 description:         Utilities for showing string-like things.
 homepage:            https://github.com/owensmurray/om-show
@@ -19,7 +19,7 @@
 
 common dependencies
   build-depends:
-    , aeson >= 2.0.3.0  && < 2.3
+    , aeson >= 2.0.3.0  && < 2.4
     , base  >= 4.15.0.0 && < 4.23
     , text  >= 1.2.5.0  && < 2.2