diff --git a/configure.ac b/configure.ac
index 7d441d9..d234f4d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([libisofs], [1.5.3], [http://libburnia-project.org])
+AC_INIT([libisofs], [1.5.4], [http://libburnia-project.org])
 AC_PREREQ([2.50])
 dnl AC_CONFIG_HEADER([config.h])	
 
@@ -41,7 +41,7 @@ dnl If LIBISOFS_*_VERSION changes, be sure to change AC_INIT above to match.
 dnl
 LIBISOFS_MAJOR_VERSION=1
 LIBISOFS_MINOR_VERSION=5
-LIBISOFS_MICRO_VERSION=3
+LIBISOFS_MICRO_VERSION=4
 LIBISOFS_VERSION=$LIBISOFS_MAJOR_VERSION.$LIBISOFS_MINOR_VERSION.$LIBISOFS_MICRO_VERSION
 
 AC_SUBST(LIBISOFS_MAJOR_VERSION)
@@ -51,10 +51,10 @@ AC_SUBST(LIBISOFS_VERSION)
 
 dnl Libtool versioning
 LT_RELEASE=$LIBISOFS_MAJOR_VERSION.$LIBISOFS_MINOR_VERSION
-dnl 2019.11.23 development jump has happened
-dnl SONAME = 95 - 89 = 6 . Library name = libisofs.6.89.0
-LT_CURRENT=95
-LT_AGE=89
+dnl 2021.01.30 development jump has not yet happened
+dnl SONAME = 97 - 91 = 6 . Library name = libisofs.6.91.0
+LT_CURRENT=97
+LT_AGE=91
 LT_REVISION=0
 LT_CURRENT_MINUS_AGE=`expr $LT_CURRENT - $LT_AGE`
 
diff --git a/libisofs/libisofs.h b/libisofs/libisofs.h
index 3770914..6ab0a12 100644
--- a/libisofs/libisofs.h
+++ b/libisofs/libisofs.h
@@ -4,7 +4,7 @@
 
 /*
  * Copyright (c) 2007-2008 Vreixo Formoso, Mario Danic
- * Copyright (c) 2009-2020 Thomas Schmitt
+ * Copyright (c) 2009-2021 Thomas Schmitt
  *
  * This file is part of the libisofs project; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version 2 
@@ -94,7 +94,7 @@ extern "C" {
  */
 #define iso_lib_header_version_major  1
 #define iso_lib_header_version_minor  5
-#define iso_lib_header_version_micro  3
+#define iso_lib_header_version_micro  4
 
 /**
  * Get version of the libisofs library at runtime.