diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 00000000..fd5aa846
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,10 @@
+## WLED changelog
+
+### Development versions after 0.9.1 release
+
+
+#### Build 2003121
+
+- Created changelog.md - make tracking changes to code easier
+- Merged pull request #766 by @pille: Fix E1.31 out-of sequence detection
+
diff --git a/wled00/wled00.ino b/wled00/wled00.ino
index a6b16924..ba2d4b68 100644
--- a/wled00/wled00.ino
+++ b/wled00/wled00.ino
@@ -119,7 +119,7 @@
 #endif
 
 //version code in format yymmddb (b = daily build)
-#define VERSION 2003031
+#define VERSION 2003121
 
 char versionString[] = "0.9.1";