diff --git a/ChangeLog.md b/ChangeLog.md
index 7b10f97f..8eb87880 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -27,6 +27,12 @@ produce the Windows executables and installer.
 
 ---
 
+Pre-Release 5.2.1-rc2
+===
+
+This fixes a code error that prevented caused some new debug code to cause 
+CAPI queries to fail.
+
 Pre-Release 5.2.1-rc1
 ===
 
diff --git a/config.py b/config.py
index 4d74ca23..b530324f 100644
--- a/config.py
+++ b/config.py
@@ -33,7 +33,7 @@ appcmdname = 'EDMC'
 # <https://semver.org/#semantic-versioning-specification-semver>
 # Major.Minor.Patch(-prerelease)(+buildmetadata)
 # NB: Do *not* import this, use the functions appversion() and appversion_nobuild()
-_static_appversion = '5.2.1-rc1'
+_static_appversion = '5.2.1-rc2'
 _cached_version: Optional[semantic_version.Version] = None
 copyright = '© 2015-2019 Jonathan Harris, 2020-2021 EDCD'