diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 00000000..435a8d9d
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,13 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [5.0.0] - 2020-07-23
+
+- Removed single-process POW support (was only needed on Windows)
+
diff --git a/src/etc/onionrvalues.py b/src/etc/onionrvalues.py
index bbf2f8e5..47e55181 100755
--- a/src/etc/onionrvalues.py
+++ b/src/etc/onionrvalues.py
@@ -23,7 +23,7 @@ import filepaths
 DENIABLE_PEER_ADDRESS = "OVPCZLOXD6DC5JHX4EQ3PSOGAZ3T24F75HQLIUZSDSMYPEOXCPFA"
 PASSWORD_LENGTH = 25
 ONIONR_TAGLINE = 'Private P2P Communication - GPLv3 - https://Onionr.net'
-ONIONR_VERSION = '4.0.0'
+ONIONR_VERSION = '5.0.0'
 ONIONR_VERSION_CODENAME = 'Genesis'
 ONIONR_VERSION_TUPLE = tuple(ONIONR_VERSION.split('.')) # (MAJOR, MINOR, VERSION)
 API_VERSION = '1' # increments of 1; only change when something fundamental about how the API works changes. This way other nodes know how to communicate without learning too much information about you.
diff --git a/src/etc/powchoice.py b/src/etc/powchoice.py
deleted file mode 100755
index a9bcfac7..00000000
--- a/src/etc/powchoice.py
+++ /dev/null
@@ -1,27 +0,0 @@
-'''
-    Onionr - Private P2P Communication
-
-    This file does determinations for what proof of work module should be used
-'''
-'''
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <https://www.gnu.org/licenses/>.
-'''
-import platform
-def use_subprocess(config_inst):
-    use = True
-    if not config_inst.get('general.use_subprocess_pow_if_possible', True):
-        use = False
-    if 'Windows' == platform.system():
-        use = False
-    return use
\ No newline at end of file
diff --git a/src/onionrblocks/insert/main.py b/src/onionrblocks/insert/main.py
index 14f00ea6..6661603c 100644
--- a/src/onionrblocks/insert/main.py
+++ b/src/onionrblocks/insert/main.py
@@ -12,14 +12,13 @@ import filepaths
 import onionrstorage
 from .. import storagecounter
 from onionrplugins import onionrevents as events
-from etc import powchoice, onionrvalues
+from etc import onionrvalues
 import config
 import onionrcrypto as crypto
 import onionrexceptions
 from onionrusers import onionrusers
 from onionrutils import localcommand, blockmetadata, stringvalidators
 import coredb
-import onionrproofs
 from onionrproofs import subprocesspow
 import logger
 from onionrtypes import UserIDSecretKey
@@ -87,8 +86,6 @@ def insert_block(data: Union[str, bytes], header: str = 'txt',
         our_pub_key = bytesconverter.bytes_to_str(
             crypto.cryptoutils.get_pub_key_from_priv(our_private_key))
 
-    use_subprocess = powchoice.use_subprocess(config)
-
     retData = False
 
     if type(data) is None:
@@ -208,10 +205,7 @@ def insert_block(data: Union[str, bytes], header: str = 'txt',
         metadata['expire'] = expire
 
     # send block data (and metadata) to POW module to get tokenized block data
-    if use_subprocess:
-        payload = subprocesspow.SubprocessPOW(data, metadata).start()
-    else:
-        payload = onionrproofs.POW(metadata, data).waitForResult()
+    payload = subprocesspow.SubprocessPOW(data, metadata).start()
     if payload != False:  # noqa
         try:
             retData = onionrstorage.set_data(payload)