diff --git a/ChangeLog.md b/ChangeLog.md
index 54244297..68197ab6 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,6 +1,23 @@
 This is the master changelog for Elite Dangerous Market Connector.  Entries are in reverse chronological order (latest first).
 ---
 
+Release 4.2.6
+===
+
+  This release applies a workaround for a game bug to do with late Scan events.
+
+* EDDN requires that all Scan events are augmented with `StarPos` (system 
+  co-ordinates).  This is taken from the co-ordinates of the *current* system.
+
+  A sequence of EDDN messages indicated that the game can log a delayed 
+  Scan event for the previous system after having already jumped (`FSDJump` 
+  event) to another system.
+  
+  This application would then erroneously apply the new system's `StarPos` 
+  to the `Scan` from the old system.
+  
+  This application will now not send such delayed `Scan` events to EDDN at all.
+
 Release 4.2.5
 ===
 
diff --git a/config.py b/config.py
index 728b351b..1228897d 100644
--- a/config.py
+++ b/config.py
@@ -13,7 +13,7 @@ appcmdname = 'EDMC'
 # appversion **MUST** follow Semantic Versioning rules:
 # <https://semver.org/#semantic-versioning-specification-semver>
 # Major.Minor.Patch(-prerelease)(+buildmetadata)
-appversion = '4.2.5'  #-rc1+a872b5f'
+appversion = '4.2.6'  # -rc1+a872b5f'
 # For some things we want appversion without (possible) +build metadata
 appversion_nobuild = str(semantic_version.Version(appversion).truncate('prerelease'))
 copyright = u'© 2015-2019 Jonathan Harris, 2020-2021 EDCD'