diff --git a/.gitignore b/.gitignore
index b00b0fca1..b952f0309 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,7 +16,6 @@ bin/sabre-cs-fixer
 bin/hoa
 
 # Development stuff
-testdata/
 .php_cs.cache
 .idea
 
diff --git a/.travis.yml b/.travis.yml
index d1feb60de..4f50e97fd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,8 @@ php:
 env:
   global:
     - MEMCACHED_SERVER=127.0.0.1
+    - RUN_PHPCSFIXER="TRUE"
+    - RUN_PHPUNIT="TRUE"
     - RUN_PHPSTAN="FALSE"
   matrix:
     - PREFER_LOWEST="" REPORT_COVERAGE="TRUE" WITH_COVERAGE="--coverage-clover=coverage.xml"
@@ -15,19 +17,28 @@ env:
 
 matrix:
   include:
+    - name: 'PHP8'
+      dist: focal
+      php: nightly
+      env:
+        - RUN_PHPCSFIXER="FALSE"
+        - REPORT_COVERAGE="FALSE"
     - name: 'PHPStan'
       php: 7.4
       env:
+        - RUN_PHPCSFIXER="FALSE"
+        - RUN_PHPUNIT="FALSE"
         - RUN_PHPSTAN="TRUE"
         - REPORT_COVERAGE="FALSE"
   fast_finish: true
 
 before_script:
+  - if [ $RUN_PHPCSFIXER == "FALSE" ]; then composer remove --no-update --dev friendsofphp/php-cs-fixer; fi
   - composer update $PREFER_LOWEST
 
 script:
-  - if [ $RUN_PHPSTAN == "FALSE" ]; then php vendor/bin/php-cs-fixer fix --dry-run --diff; fi
-  - if [ $RUN_PHPSTAN == "FALSE" ]; then php vendor/bin/phpunit --configuration tests/phpunit.xml $WITH_COVERAGE; fi
+  - if [ $RUN_PHPCSFIXER == "TRUE" ]; then php vendor/bin/php-cs-fixer fix --dry-run --diff; fi
+  - if [ $RUN_PHPUNIT == "TRUE" ]; then php vendor/bin/phpunit --configuration tests/phpunit.xml $WITH_COVERAGE; fi
   - if [ $RUN_PHPSTAN == "TRUE" ]; then composer phpstan; fi
 
 after_success:
diff --git a/composer.json b/composer.json
index 2187f77fe..e4a0b4389 100644
--- a/composer.json
+++ b/composer.json
@@ -32,12 +32,12 @@
     "homepage" : "http://sabre.io/vobject/",
     "license" : "BSD-3-Clause",
     "require" : {
-        "php"          : "^7.1",
+        "php"          : "^7.1 || ^8.0",
         "ext-mbstring" : "*",
         "sabre/xml"    : "^2.1"
     },
     "require-dev" : {
-        "friendsofphp/php-cs-fixer": "~2.16.1",
+        "friendsofphp/php-cs-fixer": "~2.16.7",
         "phpunit/phpunit" : "^7.5 || ^8.5 || ^9.0",
         "phpstan/phpstan": "^0.12"
     },
diff --git a/lib/ITip/Broker.php b/lib/ITip/Broker.php
index c09cdf3be..4e0368e13 100644
--- a/lib/ITip/Broker.php
+++ b/lib/ITip/Broker.php
@@ -162,7 +162,7 @@ public function processMessage(Message $itipMessage, VCalendar $existingObject =
      *
      * @return array
      */
-    public function parseEvent($calendar = null, $userHref, $oldCalendar = null)
+    public function parseEvent($calendar, $userHref, $oldCalendar = null)
     {
         if ($oldCalendar) {
             if (is_string($oldCalendar)) {
diff --git a/lib/Version.php b/lib/Version.php
index 83c82a573..63452400f 100644
--- a/lib/Version.php
+++ b/lib/Version.php
@@ -14,5 +14,5 @@ class Version
     /**
      * Full version number.
      */
-    const VERSION = '4.3.4';
+    const VERSION = '4.3.5';
 }
diff --git a/lib/timezonedata/php-bc.php b/lib/timezonedata/php-bc.php
index 83f38f507..3116c6868 100644
--- a/lib/timezonedata/php-bc.php
+++ b/lib/timezonedata/php-bc.php
@@ -147,7 +147,6 @@
     'US/Michigan',
     'US/Mountain',
     'US/Pacific',
-    'US/Pacific-New',
     'US/Samoa',
     'WET',
 ];