diff --git a/gama-2.14.tar.gz b/gama-2.14.tar.gz
deleted file mode 100644
index 862c5ca..0000000
--- a/gama-2.14.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:96d628272a386f862cef49db668e60c648c1c3f46212ce51add6fa85ef5bb012
-size 14697948
diff --git a/gama-2.14.tar.gz.sig b/gama-2.14.tar.gz.sig
deleted file mode 100644
index 05d2237..0000000
--- a/gama-2.14.tar.gz.sig
+++ /dev/null
@@ -1,16 +0,0 @@
------BEGIN PGP SIGNATURE-----
-
-iQIzBAABCAAdFiEExuGCTgGAuF8xsGtqy2zmDRt3/AkFAmA791YACgkQy2zmDRt3
-/AkVdhAArE2piQ82AIzHxlQUALcZFU4McgN3HXuWUTcR4K2Mci2lOjA73/hNXVI2
-IrvV3vUs2Gn2VQthFXuPSuKb6RWk4WzSXgWVynFyQEuaYmBuPeRXNO24schRZ7rC
-G7WyFB5BVkvooLjOfpOQ/kC+b72660hrP7V01GR2aFcFTTN689Fbt83TAKSP3CET
-T9BUbHbevBRVzJ0BqjRTCiHCwRoGXbPJQyDI39dow+YHhvgC22bNCU6acUDqb0T1
-RX2eSPdaiqhANemvtDaIB8rGARF5vH9cQDjrna4dasfH48GHJy1NEwXpML65EXWN
-HllaPLU23da/y6dnB4qMjw4ywuDGPkZFSVF27tXp+fQFG+l+6k7x3HFzpGDZdVCc
-qM95/OumD02q737p2lK/2lG8k4Qvdm4ASric3fEycXjG6lzrbqpr9BdlB34/moT8
-XhTKgwsiabr9VZuKBKlIxX9NdcV3SmE7ph7Nkhr1a5Sc5uopQN2tpDPO7ohOb3P8
-RJzKTLm502KsKPkjfoarNvKkvp1cdmCeami0F5Gb7aKFWqWqnbnl8XGnFwlf4hhB
-++X2G6eVKVplbxjD9tl3cFQOPl513ZYLPsKL8+fAoIGBLA5kySkwEKSUWDgeZ/i+
-7vPbybnnKY5M0ov+zBs113JOjSDpksubCdZixEM7fsTtK3cB4eg=
-=sIEi
------END PGP SIGNATURE-----
diff --git a/gama-2.15.tar.gz b/gama-2.15.tar.gz
new file mode 100644
index 0000000..4a13c45
--- /dev/null
+++ b/gama-2.15.tar.gz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9dba50dcafa3e5e21eecea99f257ece8d2fe3af4e2fdce47168a76abd23c4ad3
+size 14699941
diff --git a/gama-2.15.tar.gz.sig b/gama-2.15.tar.gz.sig
new file mode 100644
index 0000000..18eb87c
--- /dev/null
+++ b/gama-2.15.tar.gz.sig
@@ -0,0 +1,16 @@
+-----BEGIN PGP SIGNATURE-----
+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+=qe+Q
+-----END PGP SIGNATURE-----
diff --git a/gama.changes b/gama.changes
index 01d6d4e..8a8f8b2 100644
--- a/gama.changes
+++ b/gama.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Sep 23 16:30:05 UTC 2021 - Andreas Stieger <andreas.stieger@gmx.de>
+
+- GNU gama 2.15:
+  * developer visible changes only
+
 -------------------------------------------------------------------
 Tue Mar  2 08:54:19 UTC 2021 - Andreas Stieger <andreas.stieger@gmx.de>
 
diff --git a/gama.keyring b/gama.keyring
index 48de694..9ad08cb 100644
--- a/gama.keyring
+++ b/gama.keyring
@@ -1,4 +1,3 @@
-GPG keys of Aleš Čepek <cepek>
 -----BEGIN PGP PUBLIC KEY BLOCK-----
 Version: SKS 1.1.6
 Comment: Hostname: sks.pod02.fleetstreetops.com
@@ -62,49 +61,4 @@ VsTfZB7WnF/QeOO14W3Ur3Bnu1yek+IWhEY5Bov99o69RC3rah6gbfRjyn6xU1BdWpFdgQS8
 kv8+/cWQ9Sl6d5ZYSP7XY2x+j+AJpWdnZ8PLqVL8MYM6mlFeImB0RBdo+Q42zyXjBS2DTI8V
 +lF4nXjddPteHw==
 =BAml
------END PGP PUBLIC KEY BLOCK-----
-GPG keys of Petra Millarová <millapet>
------BEGIN PGP PUBLIC KEY BLOCK-----
-
-mQGNBF8nS5oBDAC99IRlG4ZuSHgKXSwG0ls7DsT/BFwH5D74mxotWx2gQEc45xYq
-H47BZS9+OqOLAF8zLgSKwzoCOOnQ5ujBhJDjvsdaFcxdLGwVxO8MNCCLyJlP4uP5
-5e7cqqxRJ/ruG2m10Nguy2nPWW/otsRySD9aKFoD/nHbC3FWaJJj4798d7lA2310
-GT49iNpEBqCQsLc3IdCJ3x4LgvlnNewEIr2u6uTMfYEsZpOz+cSbUvk6QpeEZfWi
-PY32UDwt5gRGai5XxbCFRmGvvGhytF42ShyE26KfmGZGKh5QNaofNkAJhaxa01JM
-+/xOzvwgwtQUjEPr5qCgtsNt8jyLfqtYTm3gqae9Kg8JKFO7u6ZxArEeEo2/Xf8q
-Y8eJxvs5DbMTcxTYY38CwyycV4MYhuesRh2leqsdapIhjh/4nF11u1IQmvDcmq/1
-lZWUIw7yLONLYvr7g6v00dgSkIYsSpxKMV6Txacdb1x8eaQGbh4Y/qEO886tpPtj
-AuZNWbA6ylmFTR8AEQEAAbQiUGV0cmEgTWlsbGFyb3ZhIDxtaWxsYXBldEBnbnUu
-b3JnPokBzgQTAQoAOBYhBL6pnosCp2hoJu5+5zdnWq4WAxVqBQJfJ0uaAhsDBQsJ
-CAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEDdnWq4WAxVq+sYL/i9vlkZFee4Lee8d
-E+R9xZPT0WYEfxkHrPSTy/TQZO9k17FDkOArk53HZ6qkstF8msuQBey+04/kg6CU
-yZHAGxy34yrAEaCVnxIC8jlut1cPC/LwpleKr3FOKLmfMpCjhm/E4Bc7f7ZIThbr
-z7ciGySLvcDmskovfhG3VzjfrUoaYI7C9wStsY3h6rewoACDq9Aw5xPSnzY5CNd+
-Q1OoMpfPZB1OB72XU34bNctqZyinTqicqGXp3e3rMUDKqoc/Op9gfFBd4vwwEISt
-R44IsH/jBJSuMAy7v0zxTcpFzW2QAZtrtFAj+gRlKbqmJBd8wVlDJwv6mCRZCRT2
-HXRoaThyw4CUJTX9zeYglTbNd/roRgqJMnyZObRtzwVxopD24xRxekBQdIQPhXO1
-I1W43EZw80ohtkxokd3IFWCaI2b6rmUc4mstuI2L5X5AgXJVUsgKKEBuGX1ShxLl
-11nIfia44DWnAtP4wtJW30JXhCTb6SvGiVb2eU31WQ+b8azWX4h1BBARCAAdFiEE
-FVUUD9t7O+Dd5WeulyaJTODNlf8FAl8oIAwACgkQlyaJTODNlf/fsAEAibmgsxEW
-YwgaQdxqw5X5xkPmj/ZTs+S2YB0fcsm9op4BAK0SMCfv2zl/zLsEKC7A1NtmOe6X
-sRmv+nYv/mHZpT21uQGNBF8nS5oBDAC8p/X7TciXd2/ZlmRNvz2Iofg1ZphD/Mip
-Cd7uiUciVSZ4PvcaLX4uh+qPuCx+y4Ijm+aHvKwmaDO1+vdVFVsbyOKnCutxXP5v
-MugucbQT+MRtJnOdMkLmsjEcCHp46cMOJVEdUr02Bv0cqvGRxyd5SfYdpRh1u7Lj
-6nAi2vbhGltVjdk/h+QXdDx5z/kDavTK5+YKJbY7A/CbtMvb2hf/QAoUhKB7HGhJ
-JhZ3q0SVhx8QBnPnuJ/Ba6D8FZ+4/40ACpXeWPKETwTrCriofaJvLBGJepuYsZsT
-TcRN+AWMhU8ZVV5f0DE5GrqQEM8Nj1ewRnIuGuGLfteSKnxqhThnOizMRCXzS7O1
-pLIDhYKb/lGG9uudxOkd9cqCvo3v4OnzcLRRR9H0o7UM7spN3gt3ViDgrnGLi3vn
-OWnSjgO3LA5EItm2gGe/GwvuzmWr6k9btYoRLQis6PTOgw3I4C39XBTY245jfY8e
-a6b8c3DyJ06RFQTsZ7bqLWMc9IvRW2cAEQEAAYkBtgQYAQoAIBYhBL6pnosCp2ho
-Ju5+5zdnWq4WAxVqBQJfJ0uaAhsMAAoJEDdnWq4WAxVquewL/3Y9QS7N+iNs4i0a
-W+/Xkwi09P9VwEu7mvILCIwovJ89APGqULLbvYgt4ZgDodb/5o36wJE3P8ofsR8O
-S21NUVO5GOL5Sqaz2t5kf0jQjMS25pwFgg+fL3xkoC0i0hvduMEzXS6XJJoKd5mD
-UQTtSUBfVf3lDUmCNqs9hvcorCZswy9LIBPHFuZNmBn1Q41CnJIf5UhqV4GknNXn
-xWHCUaXnx+fFHeCBvi+aHkv+o4v/ckoYqStr019KxtrXTaL3PGr7k5ivBJ4HNjj/
-ZPUog8I/RLP8q3XLn4wAiNp3kPqoIDsMotc6Q8y8AZYsYHVPveBmcI9YGe2Wsc6w
-t0UITx7IVXwFZOzkg7hrY/BhSOsewHhKPMg2a58c6sfZiCXGys2qtdAWuqW4hzhY
-OUDmxRKyo89K6YSXXbfwz898YL+uUM7F4aXGPafdwF3SZX4pTx0rFIS3+67MjZCc
-vutbzr72KC9BUxwZ3Zndgbkc2kpWRQ0rKgEvYM0mlUnLpdT7Vw==
-=A0a7
------END PGP PUBLIC KEY BLOCK-----
-
+-----END PGP PUBLIC KEY BLOCK-----
\ No newline at end of file
diff --git a/gama.spec b/gama.spec
index 214a00c..2126d7f 100644
--- a/gama.spec
+++ b/gama.spec
@@ -17,7 +17,7 @@
 
 
 Name:           gama
-Version:        2.14
+Version:        2.15
 Release:        0
 Summary:        Adjustment of geodetic networks
 License:        GPL-3.0-or-later
@@ -26,7 +26,7 @@ URL:            https://www.gnu.org/software/gama/
 # git: http://git.savannah.gnu.org/cgit/gama.git
 Source:         http://ftp.gnu.org/pub/gnu/%{name}/%{name}-%{version}.tar.gz
 Source2:        http://ftp.gnu.org/pub/gnu/%{name}/%{name}-%{version}.tar.gz.sig
-Source3:        http://savannah.gnu.org/project/memberlist-gpgkeys.php?group=%{name}&download=1#/%{name}.keyring
+Source3:        https://savannah.gnu.org/people/viewgpg.php?user_id=3448#/%{name}.keyring
 Source4:        %{name}-rpmlintrc
 BuildRequires:  gcc-c++
 BuildRequires:  libxml2-tools