diff --git a/ChangeLog b/ChangeLog
index 49db8b053..659cfc979 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2015-08-26  Werner Lemberg  <wl@gnu.org>
+
+	* builds/unix/configure.raw: Need harfbuzz >= 0.9.21 (#45828).
+
 2015-08-25  Werner Lemberg  <wl@gnu.org>
 
 	[base] Improve kerning tracing and documentation.
diff --git a/builds/unix/configure.raw b/builds/unix/configure.raw
index 776856401..f09c0d7a2 100644
--- a/builds/unix/configure.raw
+++ b/builds/unix/configure.raw
@@ -460,7 +460,7 @@ AC_ARG_WITH([harfbuzz],
 
 have_harfbuzz=no
 if test x"$with_harfbuzz" = xyes -o x"$with_harfbuzz" = xauto; then
-  harfbuzz_pkg="harfbuzz >= 0.9.19"
+  harfbuzz_pkg="harfbuzz >= 0.9.21"
   have_harfbuzz_pkg=no
 
   if test x"$HARFBUZZ_CFLAGS" = x -a x"$HARFBUZZ_LIBS" = x; then