diff --git a/CHANGELOG.md b/CHANGELOG.md
index 55f0c9d2f5..bd55edaa95 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+Paparazzi 5.1.0_testing
+=======================
+
+First release candidate for next stable release.
+
+
 Paparazzi 5.1_devel
 ===================
 
diff --git a/paparazzi_version b/paparazzi_version
index 6b01cf7563..2123463cbc 100755
--- a/paparazzi_version
+++ b/paparazzi_version
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-DEF_VER=v5.1_devel
+DEF_VER=v5.1.0_testing
 
 # First try git describe (if running on a git repo),
 # then use default version from above (for release tarballs).