diff --git a/.gitignore b/.gitignore
index 222f327..c95a2c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ rcs-5.7.tar.gz
 /rcs-5.9.2.tar.xz
 /rcs-5.9.3.tar.xz
 /rcs-5.9.4.tar.xz
+/rcs-5.10.0.tar.xz
diff --git a/rcs-5.9.4-t810_disable.patch b/rcs-5.9.4-t810_disable.patch
deleted file mode 100644
index 272b6f9..0000000
--- a/rcs-5.9.4-t810_disable.patch
+++ /dev/null
@@ -1,11 +0,0 @@
-diff -up rcs-5.9.4/tests/known-failures.in.t810_disable rcs-5.9.4/tests/known-failures.in
---- rcs-5.9.4/tests/known-failures.in.t810_disable	2018-03-27 14:48:15.344270665 +0200
-+++ rcs-5.9.4/tests/known-failures.in	2018-03-27 14:48:55.305831852 +0200
-@@ -134,6 +134,7 @@ exit 0
-   ;; t805 under OSX (see "bletcherous hack" above)
- 
- * 5.9.4
-+  t810 ; ‘ci -l -d -T’ => RCS file mtime set to epoch
- 
- * end matter
- *** Local variables:
diff --git a/rcs.spec b/rcs.spec
index f8f0561..cbbee19 100644
--- a/rcs.spec
+++ b/rcs.spec
@@ -1,19 +1,16 @@
 Summary: Revision Control System (RCS) file version management tools
 Name: rcs
-Version: 5.9.4
-Release: 14%{?dist}
+Version: 5.10.0
+Release: 1%{?dist}
 License: GPLv3+
 URL: http://www.gnu.org/software/rcs/
-Source: ftp://ftp.gnu.org/gnu/rcs/%{name}-%{version}.tar.xz
+Source: http://ftp.gnu.org/gnu/rcs/%{name}-%{version}.tar.xz
 
 Patch0: rcs-5.8-build-tweaks.patch
 
-# TODO
-Patch1: rcs-5.9.4-t810_disable.patch
-
 # for bundled(gnulib) see https://fedorahosted.org/fpc/ticket/174
 Provides: bundled(gnulib)
-BuildRequires:  gcc
+BuildRequires: gcc
 BuildRequires: autoconf
 BuildRequires: groff
 BuildRequires: ghostscript
@@ -35,18 +32,9 @@ different versions of files.
 %setup -q
 %patch0 -p1 -b .build-tweaks
 
-# TODO
-%patch1 -p1 -b .t810_disable
-
 autoconf
 
 %build
-%if "%{version}" <= "5.9.4"
-# FIXME: Package suffers from c11/inline issues
-# Fall back to c99
-# Proper fix would be to fix the source-code
-CFLAGS="${RPM_OPT_FLAGS} -std=c99"
-%endif
 %configure --with-diffutils
 make %{?_smp_mflags}
 
@@ -67,6 +55,9 @@ make check XFAIL_TESTS="`tests/known-failures %{version}`"
 %{_infodir}/*
 
 %changelog
+* Sat Nov 14 2020 Christoph Karl <pampelmuse [AT] gmx [DOT] at> - 5.10.0-1
+- Update to upstream 5.10.0
+
 * Wed Jul 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 5.9.4-14
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
 
diff --git a/sources b/sources
index 0ab67b4..400dd4a 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-ab57933fb214384e69664ec1c81775fc  rcs-5.9.4.tar.xz
+SHA512 (rcs-5.10.0.tar.xz) = d42bded1214f27dfcbe912bbabad8479555a02bc57000a62512d63ff0672de1ed23911cd15c9d1aa4b9a53794ac3fd45937fa1cbc0fcb9d54a3ede4d831f76d0