diff --git a/README.md b/README.md
index 7a17102..1094b2f 100644
--- a/README.md
+++ b/README.md
@@ -139,6 +139,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Changed
+
+- Removed sorting from `column_sidecar` transform because this caused an error in at least one of my books
+
 ## [0.5.2-beta] - 2023-05-22
 
 - Many thanks to @elmodor and igorius for their help!
diff --git a/config.py b/config.py
index b6027fd..b3cd8d5 100644
--- a/config.py
+++ b/config.py
@@ -157,8 +157,7 @@
         {k: d[k] for k in d if k != 'calculated'},
         skipkeys=True,
         indent=2,
-        default=str,
-        sort_keys=True
+        default=str
     )),
 }]
 CHECKBOXES = [{