diff --git a/CHANGELOG.md b/CHANGELOG.md
index c640687..7869166 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ### v3.9.x - [Unreleased]
 
+### v3.9.7 - 2019-08-02
+
 #### Added
 
 - MySQL configuration tuning
@@ -28,6 +30,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Removed WordOps version from the Nginx header X-Powered-By to avoid possible security issues
 - Several code quality improvements to speed up WordOps execution
 - Few adjustements on PHP-FPM configuration (max_input_time,opcache.consistency_checks)
+-
 
 #### Fixed
 
@@ -35,6 +38,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Fail2ban standalone install
 - `wo stack purge --all` error due to PHP7.3 check
 - Nginx helper configuration during plugin install for Nginx fastcgi_cache and redis-cache
+- phpRedisAdmin stack installation
+- Fixed Travis CI build on pull requests
 
 ### v3.9.6.2 - 2019-07-24
 
diff --git a/install b/install
index 83c90a8..204861e 100755
--- a/install
+++ b/install
@@ -7,10 +7,10 @@
 # Copyright (c) 2019 - WordOps
 # This script is licensed under M.I.T
 # -------------------------------------------------------------------------
-# Version 3.9.6.3 - 2019-07-29
+# Version 3.9.7 - 2019-08-02
 # -------------------------------------------------------------------------
 readonly wo_version_old="2.2.3"
-readonly wo_version_new="3.9.6.3"
+readonly wo_version_new="3.9.7"
 # CONTENTS
 # ---
 # 1. VARIABLES AND DECLARATIONS
diff --git a/setup.py b/setup.py
index c2b96ff..14a12e6 100644
--- a/setup.py
+++ b/setup.py
@@ -56,7 +56,7 @@ if not os.path.isfile('/root/.gitconfig'):
     shutil.copy2(os.path.expanduser("~")+'/.gitconfig', '/root/.gitconfig')
 
 setup(name='wo',
-      version='3.9.6.2',
+      version='3.9.7',
       description=long_description,
       long_description=long_description,
       classifiers=[],
diff --git a/wo/cli/plugins/stack.py b/wo/cli/plugins/stack.py
index 6d8c898..ef34d53 100644
--- a/wo/cli/plugins/stack.py
+++ b/wo/cli/plugins/stack.py
@@ -10,6 +10,7 @@ import pwd
 import random
 import shutil
 import string
+import re
 
 import psutil
 # from pynginxconfig import NginxConfig
@@ -1590,7 +1591,8 @@ class WOStackController(CementBaseController):
 
             # PHPREDISADMIN
             if self.app.pargs.phpredisadmin:
-                if not os.path.isdir('/var/www/22222/htdocs/cache/redis/phpRedisAdmin'):
+                if not os.path.isdir('/var/www/22222/htdocs/'
+                                     'cache/redis/phpRedisAdmin'):
                     Log.debug(
                         self, "Setting packages variable for phpRedisAdmin")
                     self.app.pargs.composer = True
@@ -1728,38 +1730,53 @@ class WOStackController(CementBaseController):
                 WOShellExec.cmd_exec(self, "systemctl enable redis-server")
                 if os.path.isfile("/etc/redis/redis.conf"):
                     wo_ram = psutil.virtual_memory().total / (1024 * 1024)
-                    if wo_ram < 512:
+                    if wo_ram < 1024:
                         Log.debug(self, "Setting maxmemory variable to "
                                   "{0} in redis.conf"
                                   .format(int(wo_ram*1024*1024*0.1)))
-                        WOShellExec.cmd_exec(self, "sed -i 's/# maxmemory"
-                                             " <bytes>/maxmemory {0}/'"
-                                             " /etc/redis/redis.conf"
-                                             .format(int(wo_ram*1024*1024*0.1)))
+                        WOFileUtils.searchreplace(self,
+                                                  "/etc/redis/redis.conf",
+                                                  "# maxmemory <bytes>",
+                                                  "maxmemory {0}"
+                                                  .format
+                                                  (int(wo_ram*1024*1024*0.1)))
                         Log.debug(
                             self, "Setting maxmemory-policy variable to "
                             "allkeys-lru in redis.conf")
-                        WOShellExec.cmd_exec(self, "sed -i 's/# maxmemory-"
-                                             "policy.*/maxmemory-policy "
-                                             "allkeys-lru/' "
-                                                   "/etc/redis/redis.conf")
+                        WOFileUtils.searchreplace(self,
+                                                  "/etc/redis/redis.conf",
+                                                  "# maxmemory-policy "
+                                                  "noeviction",
+                                                  "maxmemory-policy "
+                                                  "allkeys-lru")
+                        Log.debug(
+                            self, "Setting tcp-backlog variable to "
+                            "in redis.conf")
+                        WOFileUtils.searchreplace(self,
+                                                  "/etc/redis/redis.conf",
+                                                  "tcp-backlog 511",
+                                                  "tcp-backlog 32768")
 
                         WOService.restart_service(self, 'redis-server')
                     else:
                         Log.debug(self, "Setting maxmemory variable to {0} "
                                   "in redis.conf"
                                   .format(int(wo_ram*1024*1024*0.2)))
-                        WOShellExec.cmd_exec(self, "sed -i 's/# maxmemory "
-                                             "<bytes>/maxmemory {0}/' "
-                                             "/etc/redis/redis.conf"
-                                             .format(int(wo_ram*1024*1024*0.2)))
+                        WOFileUtils.searchreplace(self,
+                                                  "/etc/redis/redis.conf",
+                                                  "# maxmemory <bytes>",
+                                                  "maxmemory {0}"
+                                                  .format
+                                                  (int(wo_ram*1024*1024*0.1)))
                         Log.debug(
                             self, "Setting maxmemory-policy variable "
                             "to allkeys-lru in redis.conf")
-                        WOShellExec.cmd_exec(self, "sed -i 's/# maxmemory-"
-                                             "policy.*/maxmemory-policy "
-                                             "allkeys-lru/' "
-                                                   "/etc/redis/redis.conf")
+                        WOFileUtils.searchreplace(self,
+                                                  "/etc/redis/redis.conf",
+                                                  "# maxmemory-policy "
+                                                  "noeviction",
+                                                  "maxmemory-policy "
+                                                  "allkeys-lru")
                         WOService.restart_service(self, 'redis-server')
             if 'mariadb-server' in apt_packages:
                 # setting innodb memory usage
diff --git a/wo/core/variables.py b/wo/core/variables.py
index d553aef..4e1ba54 100644
--- a/wo/core/variables.py
+++ b/wo/core/variables.py
@@ -10,7 +10,7 @@ class WOVariables():
     """Intialization of core variables"""
 
     # WordOps version
-    wo_version = "3.9.6.3"
+    wo_version = "3.9.7"
     # WordOps packages versions
     wo_wp_cli = "2.2.0"
     wo_adminer = "4.7.2"