diff --git a/README-GPG.md b/README-GPG.md
index ea06eb6..642c115 100644
--- a/README-GPG.md
+++ b/README-GPG.md
@@ -15,7 +15,7 @@ Update you TREZOR firmware to the latest version (at least [c720614](https://git
 
 Install latest `trezor-agent` package from [gpg-agent](https://github.com/romanz/trezor-agent/commits/gpg-agent) branch:
 ```
-$ pip install --user git+https://github.com/romanz/trezor-agent.git@gpg-agent
+$ pip install --user git+https://github.com/romanz/trezor-agent.git
 ```
 
 Define your GPG user ID as an environment variable:
diff --git a/README.md b/README.md
index f22adf8..35af86c 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,6 @@
 [![Package Version](https://img.shields.io/pypi/v/trezor_agent.svg)](https://pypi.python.org/pypi/trezor_agent/)
 [![Development Status](https://img.shields.io/pypi/status/trezor_agent.svg)](https://pypi.python.org/pypi/trezor_agent/)
 [![Downloads](https://img.shields.io/pypi/dm/trezor_agent.svg)](https://pypi.python.org/pypi/trezor_agent/)
-[![Chat](https://badges.gitter.im/romanz/trezor-agent.svg)](https://gitter.im/romanz/trezor-agent)
 
 See SatoshiLabs' blog posts about this feature:
 
@@ -15,3 +14,5 @@ See SatoshiLabs' blog posts about this feature:
 For usage with SSH, see the [following instructions](README-SSH.md).
 
 For usage with GPG, see the [following instructions](README-GPG.md).
+
+Questions, suggestions and discussions are welcome: [![Chat](https://badges.gitter.im/romanz/trezor-agent.svg)](https://gitter.im/romanz/trezor-agent)
diff --git a/trezor_agent/factory.py b/trezor_agent/factory.py
index e876a18..b19f508 100644
--- a/trezor_agent/factory.py
+++ b/trezor_agent/factory.py
@@ -56,7 +56,7 @@ def _load_trezor():
                             hid_transport=HidTransport,
                             passphrase_ack=PassphraseAck,
                             identity_type=IdentityType,
-                            required_version='>=1.3.4',
+                            required_version='>=1.4.0',
                             call_exception=CallException)
     except ImportError:
         log.exception('Missing module: install via "pip install trezor"')
diff --git a/trezor_agent/gpg/__main__.py b/trezor_agent/gpg/__main__.py
index 3a170d5..dd50309 100755
--- a/trezor_agent/gpg/__main__.py
+++ b/trezor_agent/gpg/__main__.py
@@ -16,6 +16,9 @@ log = logging.getLogger(__name__)
 def run_create(args):
     """Generate a new pubkey for a new/existing GPG identity."""
     user_id = os.environ['TREZOR_GPG_USER_ID']
+    log.warning('NOTE: in order to re-generate the exact same GPG key later, '
+                'run this command with "--time=%d" commandline flag (to set '
+                'the timestamp of the GPG key manually).', args.time)
     conn = encode.HardwareSigner(user_id=user_id,
                                  curve_name=args.ecdsa_curve)
     verifying_key = conn.pubkey(ecdh=False)
@@ -57,9 +60,9 @@ def run_create(args):
     sys.stdout.write(protocol.armor(result, 'PUBLIC KEY BLOCK'))
 
 
-def run_agent(args):
+def run_agent(args):  # pylint: disable=unused-argument
     """Run a simple GPG-agent server."""
-    sock_path = os.path.expanduser(args.sock_path)
+    sock_path = keyring.get_agent_sock_path()
     with server.unix_domain_socket_server(sock_path) as sock:
         for conn in agent.yield_connections(sock):
             with contextlib.closing(conn):
@@ -81,7 +84,6 @@ def main():
     create_cmd.set_defaults(run=run_create)
 
     agent_cmd = subparsers.add_parser('agent')
-    agent_cmd.add_argument('-s', '--sock-path', default='~/.gnupg/S.gpg-agent')
     agent_cmd.set_defaults(run=run_agent)
 
     args = p.parse_args()
diff --git a/trezor_agent/gpg/decode.py b/trezor_agent/gpg/decode.py
index d69050c..ded5c98 100644
--- a/trezor_agent/gpg/decode.py
+++ b/trezor_agent/gpg/decode.py
@@ -25,10 +25,17 @@ def parse_subpackets(s):
 
     while True:
         try:
-            subpacket_len = s.readfmt('B')
+            first = s.readfmt('B')
         except EOFError:
             break
 
+        if first < 192:
+            subpacket_len = first
+        elif first < 255:
+            subpacket_len = ((first - 192) << 8) + s.readfmt('B') + 192
+        else:  # first == 255
+            subpacket_len = s.readfmt('>L')
+
         subpackets.append(s.read(subpacket_len))
 
     return subpackets
diff --git a/trezor_agent/gpg/keyring.py b/trezor_agent/gpg/keyring.py
index b5d21d0..f420fa2 100644
--- a/trezor_agent/gpg/keyring.py
+++ b/trezor_agent/gpg/keyring.py
@@ -13,9 +13,16 @@ from .. import util
 log = logging.getLogger(__name__)
 
 
-def connect_to_agent(sock_path='~/.gnupg/S.gpg-agent', sp=subprocess):
+def get_agent_sock_path(sp=subprocess):
+    """Parse gpgconf output to find out GPG agent UNIX socket path."""
+    lines = sp.check_output(['gpgconf', '--list-dirs']).strip().split('\n')
+    dirs = dict(line.split(':', 1) for line in lines)
+    return dirs['agent-socket']
+
+
+def connect_to_agent(sp=subprocess):
     """Connect to GPG agent's UNIX socket."""
-    sock_path = os.path.expanduser(sock_path)
+    sock_path = get_agent_sock_path(sp=sp)
     sp.check_call(['gpg-connect-agent', '/bye'])
     sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
     sock.connect(sock_path)