diff --git a/software/nayuos/instance.cfg b/software/nayuos/instance.cfg
index d51e875f11d7e85caa5870f94402aef7e1396251..90e528fa9ad81a51253de36094b1636bfaee1b6d 100644
--- a/software/nayuos/instance.cfg
+++ b/software/nayuos/instance.cfg
@@ -99,7 +99,7 @@ context =
 recipe = slapos.recipe.template:jinja2
 template = {{ software_dir }}/scripts/cros_full_build.in
 rendered = ${directory:run}/cros_full_build
-md5sum = 2a64b5cc0314ec2221a949928956f5c0
+md5sum = ff09ba2bda748af933c78de4df9149fc
 mode = 0700
 context =
   key bash_path                         bin:bash
@@ -111,6 +111,7 @@ context =
   key keep_cache                        parameters:configuration.keep_cache
   key ebuilds_dir                       nayuos-ebuilds:location
   raw scripts_dir                       {{ software_dir }}/scripts
+  raw patches_dir                       {{ software_dir }}/patches
   raw logo_dir                          {{ software_dir }}/logo
 # packages to be copied from our overlay into ChromiuOS' overlay
 # those packages will be marked as dependency of root filesystem
diff --git a/software/nayuos/patches/user-agent.patch b/software/nayuos/patches/user-agent.patch
new file mode 100644
index 0000000000000000000000000000000000000000..79f68d5c210da57542a8286ccba51bf97d7e0160
--- /dev/null
+++ b/software/nayuos/patches/user-agent.patch
@@ -0,0 +1,14 @@
+diff --git a/login_manager/chrome_setup.cc b/login_manager/chrome_setup.cc
+index cbe93f471..bd72cbb09 100644
+--- a/login_manager/chrome_setup.cc
++++ b/login_manager/chrome_setup.cc
+@@ -341,6 +341,9 @@ void AddSystemFlags(ChromiumCommandBuilder* builder) {
+   // On developer systems, set a flag to let the browser know.
+   if (builder->is_developer_end_user())
+     builder->AddArg("--system-developer-mode");
++  //Modify user agent to improve anonimity by preventing fingerprinting
++  const char* useragent = "$USERAGENTSTRING"
++  builder->AddArg(base::StringPrintf("--user-agent=%s",useragent))
+ }
+ 
+ // Adds UI-related flags to the command line.
diff --git a/software/nayuos/scripts/cros_full_build.in b/software/nayuos/scripts/cros_full_build.in
index fc066d7f17247093288c6c1264135204ca47ba62..83afa7004562e6024029a52280370637d6af2687 100644
--- a/software/nayuos/scripts/cros_full_build.in
+++ b/software/nayuos/scripts/cros_full_build.in
@@ -152,6 +152,11 @@ increase_revision_number ${CHROMIUM_OVERLAY}/chromeos-base/openssh-server-init/
 sed -i -n '/src_install/q;p' $(latest_ebuild ${CHROMIUM_OVERLAY}/chromeos-base/chromeos-sshd-init)
 increase_revision_number ${CHROMIUM_OVERLAY}/chromeos-base/chromeos-sshd-init/
 
+# modify user agent to improve anonimity by preventing fingerprinting
+# TODO: scrape https://techblog.willshouse.com/2012/01/03/most-common-user-agents/
+NEWUSERAGENT="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36"
+sed -i "s!\$USERAGENTSTRING!${NEWUSERAGENT}!" {{patches_dir}}/user-agent.patch
+patch {{ cros_location }}/{{ branch }}/src/platform2/login_manager/chrome_setup.cc {{patches_dir}}/user-agent.patch
 
 # bashrc modifications
 BASH_EBUILD_DIR="${PORTAGE_STABLE}/app-shells/bash"
diff --git a/software/nayuos/software.cfg b/software/nayuos/software.cfg
index fc19946a06fbf18df3b4be696a3739c4ffde0f6d..55921989fe7c3f6537f5bba112b74ffa42078225 100644
--- a/software/nayuos/software.cfg
+++ b/software/nayuos/software.cfg
@@ -6,6 +6,7 @@ extends =
   ../../component/libexpat/buildout.cfg
   ../../component/libaio/buildout.cfg
   ../../component/boost-lib/buildout.cfg
+  ../../component/patch/buildout.cfg
 
 parts +=
   slapos-cookbook
@@ -13,6 +14,7 @@ parts +=
   git
   curl
   thin-provisioning-tools
+  patch
 
 versions = versions
 
@@ -26,7 +28,7 @@ recipe = slapos.recipe.template:jinja2
 template = ${:_profile_base_location_}/instance.cfg
 rendered = ${buildout:directory}/instance.cfg
 mode = 0644
-md5sum = 73f964d73367dbf280d904e408a7f9b8
+md5sum = 30389eea4851d3e353466e1a2712c54e
 context =
   key software_dir            :_profile_base_location_
   key instance_dir            buildout:directory