diff --git a/.gitignore b/.gitignore
index ce7d3c8..c5607e5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /liborcus-0.17.2.tar.xz
+/liborcus-0.18.1.tar.xz
diff --git a/0001-include-cstdint.patch b/0001-include-cstdint.patch
deleted file mode 100644
index 3ecd8e3..0000000
--- a/0001-include-cstdint.patch
+++ /dev/null
@@ -1,25 +0,0 @@
-diff -ru liborcus-0.17.2.orig/include/orcus/base64.hpp liborcus-0.17.2/include/orcus/base64.hpp
---- liborcus-0.17.2.orig/include/orcus/base64.hpp	2023-01-23 20:34:32.641993292 +0000
-+++ liborcus-0.17.2/include/orcus/base64.hpp	2023-01-23 20:43:45.653157969 +0000
-@@ -9,8 +9,9 @@
- #define __ORCUS_BASE64_HPP__
- 
- #include "env.hpp"
--#include <vector>
-+#include <cstdint>
- #include <string>
-+#include <vector>
- 
- namespace orcus {
- 
-diff -ru liborcus-0.17.2.orig/include/orcus/types.hpp liborcus-0.17.2/include/orcus/types.hpp
---- liborcus-0.17.2.orig/include/orcus/types.hpp	2023-01-23 20:34:32.641993292 +0000
-+++ liborcus-0.17.2/include/orcus/types.hpp	2023-01-23 20:35:00.060249357 +0000
-@@ -8,6 +8,7 @@
- #ifndef INCLUDED_ORCUS_TYPES_HPP
- #define INCLUDED_ORCUS_TYPES_HPP
- 
-+#include <cstdint>
- #include <cstdlib>
- #include <vector>
- #include <string>
diff --git a/liborcus-noexamples.patch b/liborcus-noexamples.patch
deleted file mode 100644
index 01f9cdf..0000000
--- a/liborcus-noexamples.patch
+++ /dev/null
@@ -1,8 +0,0 @@
---- a/Makefile.am	2018-09-14 22:51:18.000000000 +0100
-+++ b/Makefile.am	2020-03-17 15:37:37.493186784 +0000
-@@ -1,4 +1,4 @@
--SUBDIRS = src include benchmark	doc_example
-+SUBDIRS = src include benchmark
- ACLOCAL_AMFLAGS = -I m4
- 
- pcfiles = liborcus-@ORCUS_API_VERSION@.pc
diff --git a/liborcus.spec b/liborcus.spec
index 8eb9528..6f62e63 100644
--- a/liborcus.spec
+++ b/liborcus.spec
@@ -1,4 +1,4 @@
-%global apiversion 0.17
+%global apiversion 0.18
 
 %if 0%{?rhel}
 
@@ -16,15 +16,13 @@
 %endif
 
 Name: liborcus
-Version: 0.17.2
+Version: 0.18.1
 Release: %autorelease
 Summary: Standalone file import filter library for spreadsheet documents
 
 License: MPL-2.0
 URL: https://gitlab.com/orcus/orcus
 Source0: https://kohei.us/files/orcus/src/%{name}-%{version}.tar.xz
-Patch0:  liborcus-noexamples.patch
-Patch1:  0001-include-cstdint.patch
 
 BuildRequires: make
 BuildRequires: boost-devel
@@ -35,7 +33,7 @@ BuildRequires: automake
 BuildRequires: help2man
 BuildRequires: pkgconfig(libixion-0.17)
 %endif
-BuildRequires: pkgconfig(mdds-2.0)
+BuildRequires: pkgconfig(mdds-2.1)
 %if %{with python}
 BuildRequires: pkgconfig(python3)
 %if 0%{?rhel}
diff --git a/sources b/sources
index 17b489d..efab461 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (liborcus-0.17.2.tar.xz) = 8ad8db46c23673260057aff555286d95ebfeff0a027bdeae24f11f8aa12456284f7f4446edddb91936b3011eb1227cfe1618ab3c4d909f8356c8c151f5739d79
+SHA512 (liborcus-0.18.1.tar.xz) = 73cbfe64e607165b9311f7330505dfcd0d16de42212e5ace55b588d6ef869221de51d22fc069553ac08e847fad1330cc3915f7e3769dc04c17b11914abb4acdd