diff --git a/NEWS b/NEWS
index 7de793e5b..1145412cb 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,19 @@
+Overview of changes leading to 5.1.0
+Sunday, July 31, 2022
+====================================
+- More extensive buffer tracing messages. (Behdad Esfahbod)
+- Fix hb-ft regression in bitmap fonts rendering. (Behdad Esfahbod)
+- Support extension promotion of lookups in hb-subset-repacker. (Garret Rieger)
+- A new HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL for scripts that use elongation
+  (e.g. Arabic) to signify where it is safe to insert tatweel glyph without
+  interrupting shaping. (Behdad Esfahbod)
+- Add “--safe-to-insert-tatweel” to “hb-shape” tool. (Behdad Esfahbod)
+
+- New API
++HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL
++HB_BUFFER_FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL
+
+
 Overview of changes leading to 5.0.1
 Saturday, July 23, 2022
 ====================================
diff --git a/configure.ac b/configure.ac
index 50fde646d..0add0bb59 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 AC_PREREQ([2.64])
 AC_INIT([HarfBuzz],
-        [5.0.1],
+        [5.1.0],
         [https://github.com/harfbuzz/harfbuzz/issues/new],
         [harfbuzz],
         [http://harfbuzz.org/])
diff --git a/meson.build b/meson.build
index 33908a2c3..df4443fb2 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project('harfbuzz', 'c', 'cpp',
   meson_version: '>= 0.55.0',
-  version: '5.0.1',
+  version: '5.1.0',
   default_options: [
     'cpp_rtti=false',       # Just to support msvc, we are passing -fno-exceptions also anyway
     'cpp_std=c++11',
diff --git a/src/hb-buffer.h b/src/hb-buffer.h
index d4eda9782..c6af759fb 100644
--- a/src/hb-buffer.h
+++ b/src/hb-buffer.h
@@ -146,7 +146,11 @@ typedef struct hb_glyph_info_t {
 				   Mongolian, Syriac, etc.), this flag signifies
 				   that it is safe to insert a U+0640 TATWEEL
 				   character *before* this cluster for elongation.
-				   Since: REPLACEME
+				   This flag does not determine the
+				   script-specific elongation places, but only
+				   when it is safe to do the elongation without
+				   interrupting text shaping.
+				   Since: 5.1.0
  * @HB_GLYPH_FLAG_DEFINED: All the currently defined flags.
  *
  * Flags for #hb_glyph_info_t.
@@ -382,7 +386,7 @@ hb_buffer_guess_segment_properties (hb_buffer_t *buffer);
  * @HB_BUFFER_FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL:
  *                      flag indicating that the @HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL
  *                      glyph-flag should be produced by the shaper. By default
- *                      it will not be produced. Since: REPLACEME
+ *                      it will not be produced. Since: 5.1.0
  * @HB_BUFFER_FLAG_DEFINED: All currently defined flags: Since: 4.4.0
  *
  * Flags for #hb_buffer_t.
diff --git a/src/hb-version.h b/src/hb-version.h
index 40ea3eb01..a1586a58b 100644
--- a/src/hb-version.h
+++ b/src/hb-version.h
@@ -47,20 +47,20 @@ HB_BEGIN_DECLS
  *
  * The minor component of the library version available at compile-time.
  */
-#define HB_VERSION_MINOR 0
+#define HB_VERSION_MINOR 1
 /**
  * HB_VERSION_MICRO:
  *
  * The micro component of the library version available at compile-time.
  */
-#define HB_VERSION_MICRO 1
+#define HB_VERSION_MICRO 0
 
 /**
  * HB_VERSION_STRING:
  *
  * A string literal containing the library version available at compile-time.
  */
-#define HB_VERSION_STRING "5.0.1"
+#define HB_VERSION_STRING "5.1.0"
 
 /**
  * HB_VERSION_ATLEAST: