diff --git a/.gitignore b/.gitignore
index 5568313..0598788 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,3 +29,5 @@ mmapper-2.0.4-final2-source.tar.gz
 /MMapper-19.12.0.tar.gz
 /MMapper-19.12.1.tar.gz
 /MMapper-20.03.0.tar.gz
+/MMapper-20.05.0.tar.gz
+/glm-0.9.9.7.zip
diff --git a/gcc10.patch b/gcc10.patch
deleted file mode 100644
index c10c195..0000000
--- a/gcc10.patch
+++ /dev/null
@@ -1,11 +0,0 @@
-diff -Nrup a/src/global/Array.h b/src/global/Array.h
---- a/src/global/Array.h	2019-10-31 22:08:25.000000000 -0600
-+++ b/src/global/Array.h	2019-12-03 11:51:50.764974430 -0700
-@@ -3,6 +3,7 @@
- // Copyright (C) 2019 The MMapper Authors
- 
- #include <array>
-+#include <cstddef>
- 
- #include "RuleOf5.h"
- 
diff --git a/mmapper.spec b/mmapper.spec
index 86635f4..72ddc7d 100644
--- a/mmapper.spec
+++ b/mmapper.spec
@@ -1,13 +1,12 @@
 Name:           mmapper
-Version:        20.03.0
+Version:        20.05.0
 Release:        1%{?dist}
 Summary:        Graphical MUME mapper
 
 License:        GPLv2+
 URL:            https://github.com/MUME/MMapper
 Source0:        https://github.com/MUME/MMapper/archive/v%{version}/MMapper-%{version}.tar.gz
-Source1:        https://github.com/g-truc/glm/archive/0.9.9-a2.zip
-Patch0:         gcc10.patch
+Source1:        https://github.com/g-truc/glm/releases/download/0.9.9.7/glm-0.9.9.7.zip
 
 BuildRequires:  /usr/bin/appstream-util
 BuildRequires:  cmake
@@ -65,6 +64,9 @@ desktop-file-validate $RPM_BUILD_ROOT%{_datadir}/applications/org.mume.MMapper.d
 
 
 %changelog
+* Thu May 21 2020 Kalev Lember <klember@redhat.com> - 20.05.0-1
+- Update to 20.05.0
+
 * Mon Mar 30 2020 Kalev Lember <klember@redhat.com> - 20.03.0-1
 - Update to 20.03.0
 
diff --git a/sources b/sources
index 67771ca..aa81a61 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (0.9.9-a2.zip) = b3a6200dd2f86a14e55b9ee1d045b224f189a9651cfbedd9632c8bb4b67fb2f14d0c21790f43bfddcb457741a440d868ba2becd195034f8d44f7b335a5bc02ec
-SHA512 (MMapper-20.03.0.tar.gz) = e06f8d0499e1d1afdffc63f1d5f7e0547d53ee272ad6e310dd7977da5cb47990062417ecfde0d9967b0fe703b66b0b7592215a6f4574f8fd1928d1443edf92b7
+SHA512 (glm-0.9.9.7.zip) = 821d52032bbf93a2c77d74270e676ad1965a263732c5ca9d0b647abd689f9d69ded1d5134e3801947aa81b169ce98ba11d855d90fcc0cb843cded889dd4b5405
+SHA512 (MMapper-20.05.0.tar.gz) = e9bf639cfc9d7513b2a372e368708d1fd4b1f3fbe848e06f01294805297f4e242e864d53f36c4cd876baf6e506ce46885daa759104a8cb77d9a4a8071cf45004