diff --git a/HISTORY.rst b/HISTORY.rst
index 2187c582..97729197 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -24,6 +24,7 @@ PlatformIO 3.0
   (`issue #814 <https://github.com/platformio/platformio/issues/814>`_)
 * Fixed issue with ``PATH`` auto-configuring for upload tools
 * Fixed ``99-platformio-udev.rules`` checker for Linux OS
+* Stopped supporting PySerial 2.7
 
 -------
 
diff --git a/docs/userguide/cmd_device.rst b/docs/userguide/cmd_device.rst
index 379c2eda..a890a4db 100644
--- a/docs/userguide/cmd_device.rst
+++ b/docs/userguide/cmd_device.rst
@@ -152,14 +152,17 @@ Set initial ``RTS`` line state, default ``0``
 
 Set initial ``DTR`` line state, default ``0``
 
+.. option::
+    --echo
+
+Enable local echo, default ``Off``
+
 .. option::
     --encoding
 
 Set the encoding for the serial port (e.g. ``hexlify``, ``Latin1``, ``UTF-8``),
 default ``UTF-8``.
 
-**NEW**: Available in Miniterm/PySerial 3.0
-
 .. option::
     -f, --filter
 
@@ -173,8 +176,6 @@ Add text transformation. Available filters:
 * ``printable`` Show decimal code for all non-ASCII characters and replace
   most control codes
 
-**NEW**: Available in Miniterm/PySerial 3.0
-
 .. option::
     --eol
 
@@ -187,8 +188,6 @@ End of line mode (``CR``, ``LF`` or ``CRLF``), default ``CRLF``
 
 Do not apply any encodings/transformations
 
-**NEW**: Available in Miniterm/PySerial 3.0
-
 .. option::
     --exit-char
 
@@ -209,40 +208,6 @@ default ``20`` (DEC)
 
 Diagnostics: suppress non-error messages, default ``Off``
 
-.. option::
-    --echo
-
-Enable local echo, default ``Off``
-
-.. option::
-    --cr
-
-Do not send ``CR+LF``, send ``R`` only, default ``Off``
-
-**REMOVED**: Is not available in Miniterm/PySerial 3.0
-
-.. option::
-    --lf
-
-Do not send ``CR+LF``, send ``LF`` only, default ``Off``
-
-**REMOVED**: Is not available in Miniterm/PySerial 3.0
-
-.. option::
-    -d, --debug
-
-Debug received data (escape non-printable chars). ``--debug`` can be given
-multiple times:
-
-0. just print what is received
-1. escape non-printable characters, do newlines as unusual
-2. escape non-printable characters, newlines too
-3. hex dump everything
-
-**REMOVED**: Is not available in Miniterm/PySerial 3.0.
-See :option:`platformio device monitor --encoding` and
-:option:`platformio device monitor --filter` options.
-
 Examples
 ~~~~~~~~
 
diff --git a/docs/userguide/remote/cmd_device.rst b/docs/userguide/remote/cmd_device.rst
index 2dca1129..cbfe1877 100644
--- a/docs/userguide/remote/cmd_device.rst
+++ b/docs/userguide/remote/cmd_device.rst
@@ -171,6 +171,11 @@ Set initial ``RTS`` line state, default ``0``
 
 Set initial ``DTR`` line state, default ``0``
 
+.. option::
+    --echo
+
+Enable local echo, default ``Off``
+
 .. option::
     --encoding
 
@@ -220,11 +225,6 @@ default ``20`` (DEC)
 
 Diagnostics: suppress non-error messages, default ``Off``
 
-.. option::
-    --echo
-
-Enable local echo, default ``Off``
-
 Examples
 ~~~~~~~~
 
diff --git a/platformio/commands/device.py b/platformio/commands/device.py
index 28d6e9e8..367be3c4 100644
--- a/platformio/commands/device.py
+++ b/platformio/commands/device.py
@@ -16,10 +16,8 @@ import json
 import sys
 
 import click
-from serial import VERSION as PYSERIAL_VERSION
 from serial.tools import miniterm
 
-from platformio import app
 from platformio.exception import MinitermException
 from platformio.util import get_serialports
 
@@ -45,181 +43,87 @@ def device_list(json_output):
         click.echo("")
 
 
-if int(PYSERIAL_VERSION[0]) == 3:
+@cli.command("monitor", short_help="Monitor device (Serial)")
+@click.option("--port", "-p", help="Port, a number or a device name")
+@click.option(
+    "--baud", "-b", type=int, default=9600, help="Set baud rate, default=9600")
+@click.option(
+    "--parity",
+    default="N",
+    type=click.Choice(["N", "E", "O", "S", "M"]),
+    help="Set parity, default=N")
+@click.option(
+    "--rtscts", is_flag=True, help="Enable RTS/CTS flow control, default=Off")
+@click.option(
+    "--xonxoff",
+    is_flag=True,
+    help="Enable software flow control, default=Off")
+@click.option(
+    "--rts",
+    default=None,
+    type=click.Choice(["0", "1"]),
+    help="Set initial RTS line state")
+@click.option(
+    "--dtr",
+    default=None,
+    type=click.Choice(["0", "1"]),
+    help="Set initial DTR line state")
+@click.option("--echo", is_flag=True, help="Enable local echo, default=Off")
+@click.option(
+    "--encoding",
+    default="UTF-8",
+    help="Set the encoding for the serial port (e.g. hexlify, "
+    "Latin1, UTF-8), default: UTF-8")
+@click.option("--filter", "-f", multiple=True, help="Add text transformation")
+@click.option(
+    "--eol",
+    default="CRLF",
+    type=click.Choice(["CR", "LF", "CRLF"]),
+    help="End of line mode, default=CRLF")
+@click.option(
+    "--raw", is_flag=True, help="Do not apply any encodings/transformations")
+@click.option(
+    "--exit-char",
+    type=int,
+    default=3,
+    help="ASCII code of special character that is used to exit "
+    "the application, default=3 (Ctrl+C)")
+@click.option(
+    "--menu-char",
+    type=int,
+    default=20,
+    help="ASCII code of special character that is used to "
+    "control miniterm (menu), default=20 (DEC)")
+@click.option(
+    "--quiet",
+    is_flag=True,
+    help="Diagnostics: suppress non-error messages, default=Off")
+def device_monitor(**kwargs):
+    if not kwargs['port']:
+        for item in get_serialports():
+            if "VID:PID" in item['hwid']:
+                kwargs['port'] = item['port']
+                break
 
-    @cli.command("monitor", short_help="Monitor device (Serial)")
-    @click.option("--port", "-p", help="Port, a number or a device name")
-    @click.option(
-        "--baud",
-        "-b",
-        type=int,
-        default=9600,
-        help="Set baud rate, default=9600")
-    @click.option(
-        "--parity",
-        default="N",
-        type=click.Choice(["N", "E", "O", "S", "M"]),
-        help="Set parity, default=N")
-    @click.option(
-        "--rtscts",
-        is_flag=True,
-        help="Enable RTS/CTS flow control, default=Off")
-    @click.option(
-        "--xonxoff",
-        is_flag=True,
-        help="Enable software flow control, default=Off")
-    @click.option(
-        "--rts",
-        default=None,
-        type=click.Choice(["0", "1"]),
-        help="Set initial RTS line state")
-    @click.option(
-        "--dtr",
-        default=None,
-        type=click.Choice(["0", "1"]),
-        help="Set initial DTR line state")
-    @click.option(
-        "--echo", is_flag=True, help="Enable local echo, default=Off")
-    @click.option(
-        "--encoding",
-        default="UTF-8",
-        help="Set the encoding for the serial port (e.g. hexlify, "
-        "Latin1, UTF-8), default: UTF-8")
-    @click.option(
-        "--filter", "-f", multiple=True, help="Add text transformation")
-    @click.option(
-        "--eol",
-        default="CRLF",
-        type=click.Choice(["CR", "LF", "CRLF"]),
-        help="End of line mode, default=CRLF")
-    @click.option(
-        "--raw",
-        is_flag=True,
-        help="Do not apply any encodings/transformations")
-    @click.option(
-        "--exit-char",
-        type=int,
-        default=3,
-        help="ASCII code of special character that is used to exit "
-        "the application, default=3 (Ctrl+C)")
-    @click.option(
-        "--menu-char",
-        type=int,
-        default=20,
-        help="ASCII code of special character that is used to "
-        "control miniterm (menu), default=20 (DEC)")
-    @click.option(
-        "--quiet",
-        is_flag=True,
-        help="Diagnostics: suppress non-error messages, default=Off")
-    def device_monitor(**kwargs):
-        if not kwargs['port']:
-            for item in get_serialports():
-                if "VID:PID" in item['hwid']:
-                    kwargs['port'] = item['port']
-                    break
+    sys.argv = ["monitor"]
+    for k, v in kwargs.iteritems():
+        if k in ("port", "baud", "rts", "dtr"):
+            continue
+        k = "--" + k.replace("_", "-")
+        if isinstance(v, bool):
+            if v:
+                sys.argv.append(k)
+        elif isinstance(v, tuple):
+            for i in v:
+                sys.argv.extend([k, i])
+        else:
+            sys.argv.extend([k, str(v)])
 
-        sys.argv = ["monitor"]
-        for k, v in kwargs.iteritems():
-            if k in ("port", "baud", "rts", "dtr"):
-                continue
-            k = "--" + k.replace("_", "-")
-            if isinstance(v, bool):
-                if v:
-                    sys.argv.append(k)
-            elif isinstance(v, tuple):
-                for i in v:
-                    sys.argv.extend([k, i])
-            else:
-                sys.argv.extend([k, str(v)])
-
-        try:
-            miniterm.main(  # pylint: disable=E1123
-                default_port=kwargs['port'],
-                default_baudrate=kwargs['baud'],
-                default_rts=kwargs['rts'],
-                default_dtr=kwargs['dtr'])
-        except Exception as e:  # pylint: disable=W0702
-            raise MinitermException(e)
-else:
-
-    @cli.command("monitor", short_help="Monitor device (Serial)")
-    @click.option("--port", "-p", help="Port, a number or a device name")
-    @click.option(
-        "--baud",
-        "-b",
-        type=int,
-        default=9600,
-        help="Set baud rate, default=9600")
-    @click.option(
-        "--parity",
-        default="N",
-        type=click.Choice(["N", "E", "O", "S", "M"]),
-        help="Set parity, default=N")
-    @click.option(
-        "--rtscts",
-        is_flag=True,
-        help="Enable RTS/CTS flow control, default=Off")
-    @click.option(
-        "--xonxoff",
-        is_flag=True,
-        help="Enable software flow control, default=Off")
-    @click.option(
-        "--rts",
-        default=None,
-        type=click.Choice(["0", "1"]),
-        help="Set initial RTS line state, default=0")
-    @click.option(
-        "--dtr",
-        default=None,
-        type=click.Choice(["0", "1"]),
-        help="Set initial DTR line state, default=0")
-    @click.option(
-        "--echo", is_flag=True, help="Enable local echo, default=Off")
-    @click.option(
-        "--cr",
-        is_flag=True,
-        help="Do not send CR+LF, send CR only, default=Off")
-    @click.option(
-        "--lf",
-        is_flag=True,
-        help="Do not send CR+LF, send LF only, default=Off")
-    @click.option(
-        "--debug",
-        "-d",
-        count=True,
-        help="""Debug received data (escape non-printable chars)
-    # --debug can be given multiple times:
-    # 0: just print what is received
-    # 1: escape non-printable characters, do newlines as unusual
-    # 2: escape non-printable characters, newlines too
-    # 3: hex dump everything""")
-    @click.option(
-        "--exit-char",
-        type=int,
-        default=3,
-        help="ASCII code of special character that is used to exit "
-        "the application, default=3 (Ctrl+C)")
-    @click.option(
-        "--menu-char",
-        type=int,
-        default=20,
-        help="ASCII code of special character that is used to "
-        "control miniterm (menu), default=20 (DEC)")
-    @click.option(
-        "--quiet",
-        is_flag=True,
-        help="Diagnostics: suppress non-error messages, default=Off")
-    def device_monitor(**kwargs):
-        sys.argv = app.get_session_var("command_ctx").args[1:]
-
-        if not kwargs['port']:
-            for item in get_serialports():
-                if "VID:PID" in item['hwid']:
-                    sys.argv += ["--port", item['port']]
-                    break
-
-        try:
-            miniterm.main()
-        except Exception as e:  # pylint: disable=W0702
-            raise MinitermException(e)
+    try:
+        miniterm.main(  # pylint: disable=E1123
+            default_port=kwargs['port'],
+            default_baudrate=kwargs['baud'],
+            default_rts=kwargs['rts'],
+            default_dtr=kwargs['dtr'])
+    except Exception as e:  # pylint: disable=W0702
+        raise MinitermException(e)
diff --git a/platformio/commands/remote.py b/platformio/commands/remote.py
index f6fffe46..94560ac0 100644
--- a/platformio/commands/remote.py
+++ b/platformio/commands/remote.py
@@ -20,7 +20,6 @@ from tempfile import mkdtemp
 from time import sleep
 
 import click
-from serial import VERSION as PYSERIAL_VERSION
 
 from platformio import exception, util
 from platformio.commands.device import device_monitor as cmd_device_monitor
@@ -85,151 +84,63 @@ def device_list(json_output):
     pioplus_call(sys.argv[1:])
 
 
-if int(PYSERIAL_VERSION[0]) == 3:
-
-    @remote_device.command("monitor", short_help="Monitor device (Serial)")
-    @click.option("--port", "-p", help="Port, a number or a device name")
-    @click.option(
-        "--baud",
-        "-b",
-        type=int,
-        default=9600,
-        help="Set baud rate, default=9600")
-    @click.option(
-        "--parity",
-        default="N",
-        type=click.Choice(["N", "E", "O", "S", "M"]),
-        help="Set parity, default=N")
-    @click.option(
-        "--rtscts",
-        is_flag=True,
-        help="Enable RTS/CTS flow control, default=Off")
-    @click.option(
-        "--xonxoff",
-        is_flag=True,
-        help="Enable software flow control, default=Off")
-    @click.option(
-        "--rts",
-        default=None,
-        type=click.Choice(["0", "1"]),
-        help="Set initial RTS line state")
-    @click.option(
-        "--dtr",
-        default=None,
-        type=click.Choice(["0", "1"]),
-        help="Set initial DTR line state")
-    @click.option(
-        "--echo", is_flag=True, help="Enable local echo, default=Off")
-    @click.option(
-        "--encoding",
-        default="UTF-8",
-        help="Set the encoding for the serial port (e.g. hexlify, "
-        "Latin1, UTF-8), default: UTF-8")
-    @click.option(
-        "--filter", "-f", multiple=True, help="Add text transformation")
-    @click.option(
-        "--eol",
-        default="CRLF",
-        type=click.Choice(["CR", "LF", "CRLF"]),
-        help="End of line mode, default=CRLF")
-    @click.option(
-        "--raw",
-        is_flag=True,
-        help="Do not apply any encodings/transformations")
-    @click.option(
-        "--exit-char",
-        type=int,
-        default=3,
-        help="ASCII code of special character that is used to exit "
-        "the application, default=3 (Ctrl+C)")
-    @click.option(
-        "--menu-char",
-        type=int,
-        default=20,
-        help="ASCII code of special character that is used to "
-        "control miniterm (menu), default=20 (DEC)")
-    @click.option(
-        "--quiet",
-        is_flag=True,
-        help="Diagnostics: suppress non-error messages, default=Off")
-    @click.pass_context
-    def device_monitor(ctx, **kwargs):
-        _device_monitor(ctx, **kwargs)
-else:
-
-    @remote_device.command("monitor", short_help="Monitor device (Serial)")
-    @click.option("--port", "-p", help="Port, a number or a device name")
-    @click.option(
-        "--baud",
-        "-b",
-        type=int,
-        default=9600,
-        help="Set baud rate, default=9600")
-    @click.option(
-        "--parity",
-        default="N",
-        type=click.Choice(["N", "E", "O", "S", "M"]),
-        help="Set parity, default=N")
-    @click.option(
-        "--rtscts",
-        is_flag=True,
-        help="Enable RTS/CTS flow control, default=Off")
-    @click.option(
-        "--xonxoff",
-        is_flag=True,
-        help="Enable software flow control, default=Off")
-    @click.option(
-        "--rts",
-        default=None,
-        type=click.Choice(["0", "1"]),
-        help="Set initial RTS line state, default=0")
-    @click.option(
-        "--dtr",
-        default=None,
-        type=click.Choice(["0", "1"]),
-        help="Set initial DTR line state, default=0")
-    @click.option(
-        "--echo", is_flag=True, help="Enable local echo, default=Off")
-    @click.option(
-        "--cr",
-        is_flag=True,
-        help="Do not send CR+LF, send CR only, default=Off")
-    @click.option(
-        "--lf",
-        is_flag=True,
-        help="Do not send CR+LF, send LF only, default=Off")
-    @click.option(
-        "--debug",
-        "-d",
-        count=True,
-        help="""Debug received data (escape non-printable chars)
-    # --debug can be given multiple times:
-    # 0: just print what is received
-    # 1: escape non-printable characters, do newlines as unusual
-    # 2: escape non-printable characters, newlines too
-    # 3: hex dump everything""")
-    @click.option(
-        "--exit-char",
-        type=int,
-        default=3,
-        help="ASCII code of special character that is used to exit "
-        "the application, default=3 (Ctrl+C)")
-    @click.option(
-        "--menu-char",
-        type=int,
-        default=20,
-        help="ASCII code of special character that is used to "
-        "control miniterm (menu), default=20 (DEC)")
-    @click.option(
-        "--quiet",
-        is_flag=True,
-        help="Diagnostics: suppress non-error messages, default=Off")
-    @click.pass_context
-    def device_monitor(ctx, **kwargs):
-        _device_monitor(ctx, **kwargs)
-
-
-def _device_monitor(ctx, **kwargs):
+@remote_device.command("monitor", short_help="Monitor device (Serial)")
+@click.option("--port", "-p", help="Port, a number or a device name")
+@click.option(
+    "--baud", "-b", type=int, default=9600, help="Set baud rate, default=9600")
+@click.option(
+    "--parity",
+    default="N",
+    type=click.Choice(["N", "E", "O", "S", "M"]),
+    help="Set parity, default=N")
+@click.option(
+    "--rtscts", is_flag=True, help="Enable RTS/CTS flow control, default=Off")
+@click.option(
+    "--xonxoff",
+    is_flag=True,
+    help="Enable software flow control, default=Off")
+@click.option(
+    "--rts",
+    default=None,
+    type=click.Choice(["0", "1"]),
+    help="Set initial RTS line state")
+@click.option(
+    "--dtr",
+    default=None,
+    type=click.Choice(["0", "1"]),
+    help="Set initial DTR line state")
+@click.option("--echo", is_flag=True, help="Enable local echo, default=Off")
+@click.option(
+    "--encoding",
+    default="UTF-8",
+    help="Set the encoding for the serial port (e.g. hexlify, "
+    "Latin1, UTF-8), default: UTF-8")
+@click.option("--filter", "-f", multiple=True, help="Add text transformation")
+@click.option(
+    "--eol",
+    default="CRLF",
+    type=click.Choice(["CR", "LF", "CRLF"]),
+    help="End of line mode, default=CRLF")
+@click.option(
+    "--raw", is_flag=True, help="Do not apply any encodings/transformations")
+@click.option(
+    "--exit-char",
+    type=int,
+    default=3,
+    help="ASCII code of special character that is used to exit "
+    "the application, default=3 (Ctrl+C)")
+@click.option(
+    "--menu-char",
+    type=int,
+    default=20,
+    help="ASCII code of special character that is used to "
+    "control miniterm (menu), default=20 (DEC)")
+@click.option(
+    "--quiet",
+    is_flag=True,
+    help="Diagnostics: suppress non-error messages, default=Off")
+@click.pass_context
+def device_monitor(ctx, **kwargs):
 
     def _tx_target(sock_dir):
         try:
diff --git a/setup.py b/setup.py
index 29a759d9..b54a4d19 100644
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@ install_requires = [
     "requests>=2.4.0,<3",
     "semantic_version>=2.5.0",
     "colorama",
-    "pyserial<4"
+    "pyserial>=3,<4"
 ]
 
 setup(