diff --git a/stm32/version.mk b/stm32/version.mk
index f367ad94..fa5e4718 100644
--- a/stm32/version.mk
+++ b/stm32/version.mk
@@ -1,4 +1,4 @@
 
 # Our version for this release.
-VERSION_STRING = 5.2.0
+VERSION_STRING = 5.2.1