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diff --git a/libHX-4.2.tar.xz b/libHX-4.2.tar.xz
new file mode 100644
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diff --git a/libHX.changes b/libHX.changes
index c7868a7..5caa9e0 100644
--- a/libHX.changes
+++ b/libHX.changes
@@ -1,3 +1,11 @@
+-------------------------------------------------------------------
+Sun Oct 17 16:55:45 UTC 2021 - Jan Engelhardt <jengelh@inai.de>
+
+- Update to release 4.2
+  * string: New functions ``HX_strtod_unit``, ``HX_strtoull_unit``,
+    ``HX_unit_size``, ``HX_unit_size_cu`` for converting between
+    sizes and human-readable sizes like 1457664 <-> "1.45M"/"1.39M".
+
 -------------------------------------------------------------------
 Wed Oct 13 12:59:26 UTC 2021 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/libHX.spec b/libHX.spec
index 76440d5..baa4736 100644
--- a/libHX.spec
+++ b/libHX.spec
@@ -18,7 +18,7 @@
 
 Name:           libHX
 %define lname   libHX32
-Version:        4.1
+Version:        4.2
 Release:        0
 Summary:        Collection of routines for C and C++ programming
 License:        LGPL-2.1-or-later