diff --git a/RELEASE_NOTES.rst b/RELEASE_NOTES.rst
index 2dab0c5e..5acee5f2 100644
--- a/RELEASE_NOTES.rst
+++ b/RELEASE_NOTES.rst
@@ -2,6 +2,11 @@
  Release notes for C-Blosc
 ===========================
 
+Changes from 1.21.6 to 1.21.7
+=============================
+
+#XXX version-specific blurb XXX#
+
 
 Changes from 1.21.5 to 1.21.6
 =============================
diff --git a/blosc/blosc.h b/blosc/blosc.h
index c9dc8ed7..d3e43552 100644
--- a/blosc/blosc.h
+++ b/blosc/blosc.h
@@ -19,9 +19,9 @@ extern "C" {
 /* Version numbers */
 #define BLOSC_VERSION_MAJOR    1    /* for major interface/format changes  */
 #define BLOSC_VERSION_MINOR    21   /* for minor interface/format changes  */
-#define BLOSC_VERSION_RELEASE  6    /* for tweaks, bug-fixes, or development */
+#define BLOSC_VERSION_RELEASE  7    /* for tweaks, bug-fixes, or development */
 
-#define BLOSC_VERSION_STRING   "1.21.6"  /* string version.  Sync with above! */
+#define BLOSC_VERSION_STRING   "1.21.7.dev"  /* string version.  Sync with above! */
 #define BLOSC_VERSION_REVISION "$Rev$"   /* revision version */
 #define BLOSC_VERSION_DATE     "$Date:: 2024-06-24 #$"    /* date version */