diff --git a/gama-2.27.tar.gz b/gama-2.27.tar.gz
deleted file mode 100644
index e821158..0000000
--- a/gama-2.27.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
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-oid sha256:938b3b4caff29baf2fe34283cd9a0c3310d614c467b0cba4e95fc6f4ffe33341
-size 15389806
diff --git a/gama-2.27.tar.gz.sig b/gama-2.27.tar.gz.sig
deleted file mode 100644
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@@ -1,16 +0,0 @@
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diff --git a/gama-2.28.tar.gz b/gama-2.28.tar.gz
new file mode 100644
index 0000000..9da2b94
--- /dev/null
+++ b/gama-2.28.tar.gz
@@ -0,0 +1,3 @@
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+oid sha256:5dc73fe0907b87233e28778edf6f8995059405f1fc457b8e2f76763f48a66b1a
+size 15419091
diff --git a/gama-2.28.tar.gz.sig b/gama-2.28.tar.gz.sig
new file mode 100644
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diff --git a/gama.changes b/gama.changes
index b01374e..4640e7c 100644
--- a/gama.changes
+++ b/gama.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Sun Jan 14 11:21:21 UTC 2024 - Andreas Stieger <andreas.stieger@gmx.de>
+
+- update to 2.28:
+  * developer visible changes
+
 -------------------------------------------------------------------
 Sun Nov 12 16:59:58 UTC 2023 - Andreas Stieger <andreas.stieger@gmx.de>
 
diff --git a/gama.spec b/gama.spec
index afb1d54..fac1bd7 100644
--- a/gama.spec
+++ b/gama.spec
@@ -2,6 +2,7 @@
 # spec file for package gama
 #
 # Copyright (c) 2023 SUSE LLC
+# Copyright (c) 2024 Andreas Stieger <Andreas.Stieger@gmx.de>
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -17,7 +18,7 @@
 
 
 Name:           gama
-Version:        2.27
+Version:        2.28
 Release:        0
 Summary:        Adjustment of geodetic networks
 License:        GPL-3.0-or-later
@@ -52,7 +53,7 @@ global coordinate systems is supported only partly as a gama-g3
 program.
 
 %prep
-%setup -q
+%autosetup -p1
 
 %build
 %configure
@@ -61,6 +62,9 @@ program.
 %install
 %make_install
 
+%check
+%make_build tests
+
 %files
 %license COPYING
 %doc ChangeLog* README NEWS TODO AUTHORS