diff --git a/libHX-4.19.tar.asc b/libHX-4.19.tar.asc
deleted file mode 100644
index e181134..0000000
--- a/libHX-4.19.tar.asc
+++ /dev/null
@@ -1,7 +0,0 @@
------BEGIN PGP SIGNATURE-----
-
-iHUEABYKAB0WIQS8oMXDCcrFaedKkhz3bv5dDCI6jwUCZWkWHgAKCRD3bv5dDCI6
-j1MgAP9m/go0vrdXuyg9nNfm/OD/twP17Odc2iA1ImSg6JK3hwD/W/Jz+birwugP
-Nj3nJfs3FH/SLt60Yus6Ukg8r9aPPw4=
-=3Hey
------END PGP SIGNATURE-----
diff --git a/libHX-4.19.tar.xz b/libHX-4.19.tar.xz
deleted file mode 100644
index 6082de1..0000000
--- a/libHX-4.19.tar.xz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:0384a1bd832a2688528b31af3dfecca36e94c8194a0207d871bf4e1a57e69b0a
-size 359672
diff --git a/libHX-4.21.tar.asc b/libHX-4.21.tar.asc
new file mode 100644
index 0000000..87e5f07
--- /dev/null
+++ b/libHX-4.21.tar.asc
@@ -0,0 +1,7 @@
+-----BEGIN PGP SIGNATURE-----
+
+iHUEABYKAB0WIQS8oMXDCcrFaedKkhz3bv5dDCI6jwUCZYLoEAAKCRD3bv5dDCI6
+j9M6AQCNVb7aVKEf4G7AIGr92O3DM0RhA4sFhEAiSaqcrpapRgEA+i5arCMDh7CZ
+fDXJwvFbNxHdJPsMfU7jqxDmiK6gyw4=
+=zkSf
+-----END PGP SIGNATURE-----
diff --git a/libHX-4.21.tar.xz b/libHX-4.21.tar.xz
new file mode 100644
index 0000000..62b580c
--- /dev/null
+++ b/libHX-4.21.tar.xz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d57d5e858dee40d64d413555815f06d7eda52ce96f069817452671503756550d
+size 359760
diff --git a/libHX.changes b/libHX.changes
index 02fb2e8..300face 100644
--- a/libHX.changes
+++ b/libHX.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Dec 20 13:23:27 UTC 2023 - Jan Engelhardt <jengelh@inai.de>
+
+- Update to release 4.21
+  * Resolve compile error when signed_cast macro is used.
+
 -------------------------------------------------------------------
 Thu Nov 30 23:09:57 UTC 2023 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/libHX.spec b/libHX.spec
index 74557ee..30cc9d7 100644
--- a/libHX.spec
+++ b/libHX.spec
@@ -18,7 +18,7 @@
 
 Name:           libHX
 %define lname   libHX32
-Version:        4.19
+Version:        4.21
 Release:        0
 Summary:        Collection of routines for C and C++ programming
 License:        LGPL-2.1-or-later