diff --git a/.gitignore b/.gitignore
index 36e61a1..1d570a7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 /vendor/
 composer.lock
 .phpunit.result.cache
+/composer.phar
diff --git a/.travis.yml b/.travis.yml
index b85507c..576ddfd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,6 @@
 language: php
+php:
+    - 7.3
 
 services:
   - docker
@@ -10,14 +12,12 @@ cache:
 
 before_install:
   - docker-compose up -d
-  - docker pull php:7.1-cli
-  - docker pull php:7.2-cli
   - docker pull php:7.3-cli
   - docker pull php:7.4-cli
   - docker pull php:8.0-cli
 
 install:
-  - composer install
+  - composer update
 
 script:
   - ./run-tests.sh
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 535beb6..d2c7550 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,17 @@ All notable changes to `powerdns-php` will be documented in this file.
 Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
 ## Unreleased
-[Compare v2.6.0 - Unreleased](https://github.com/exonet/powerdns-php/compare/v2.6.0...develop)
+[Compare v3.0.0 - Unreleased](https://github.com/exonet/powerdns-php/compare/v3.0.0...develop)
+
+## [v3.0.0](https://github.com/exonet/powerdns-php/releases/tag/v3.0.0) - 2021-01-05
+[Compare v2.6.0 - v3.0.0](https://github.com/exonet/powerdns-php/compare/v2.6.0...v3.0.0)
+### Breaking
+- Dropped support for unsupported PHP versions. PHP 7.3 (or newer) is now required.
+
+### Changed
+- Updated Guzzle to 7.2. (@itspluxstahre #50)
+- Updated PHPUnit to 9.5.0.
+- When running tests a `composer update` will be executed for each environment to validate the packages/config for the specified PHP version.
 
 ## [v2.6.0](https://github.com/exonet/powerdns-php/releases/tag/v2.6.0) - 2020-12-21
 [Compare v2.5.2 - v2.6.0](https://github.com/exonet/powerdns-php/compare/v2.5.2...v2.6.0)
diff --git a/composer.json b/composer.json
index 6e5a5ad..e514530 100755
--- a/composer.json
+++ b/composer.json
@@ -19,14 +19,14 @@
         }
     ],
     "require": {
-        "php": ">=7.1",
+        "php": "^7.3|^8.0",
         "ext-json": "*",
-        "guzzlehttp/guzzle": "^6.3",
+        "guzzlehttp/guzzle": "^7.2",
         "psr/log": "^1.0"
     },
     "require-dev": {
         "mockery/mockery": "^1.2",
-        "phpunit/phpunit": "^7"
+        "phpunit/phpunit": "^9"
     },
     "autoload": {
         "psr-4": {
@@ -39,7 +39,6 @@
         }
     },
     "config": {
-        "sort-packages": true,
-        "platform-check": false
+        "sort-packages": true
     }
 }
diff --git a/phpunit.xml b/phpunit.xml
index 4f42fdb..f56d653 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,20 +1,13 @@
-<phpunit
-        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/7.0/phpunit.xsd"
-        backupGlobals="true"
-        backupStaticAttributes="false"
-        bootstrap="vendor/autoload.php"
-        cacheTokens="false"
-        colors="true"
->
-    <testsuites>
-        <testsuite name="PowerDNS API Client">
-            <directory>./tests</directory>
-        </testsuite>
-    </testsuites>
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">./src</directory>
-        </whitelist>
-    </filter>
+<?xml version="1.0"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd" backupGlobals="true" backupStaticAttributes="false" bootstrap="vendor/autoload.php" colors="true">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">./src</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="PowerDNS API Client">
+      <directory>./tests</directory>
+    </testsuite>
+  </testsuites>
 </phpunit>
diff --git a/run-tests.sh b/run-tests.sh
index 3873887..4456394 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 bold=$(tput bold)
 red=$(tput setaf 1)
 green=$(tput setaf 2)
@@ -5,7 +7,7 @@ normal=$(tput sgr0)
 RESULTS=""
 HAS_FAILED_TESTS=0
 
-function run() {
+run() {
     PHP_VERSION=$1
     PDNS_VERSION=$2
     SHORT_PDNS=${PDNS_VERSION//./}
@@ -23,9 +25,10 @@ function run() {
         -e PDNS_HOST="http://pdns" \
         --net powerdns-php_default \
         -v "$PWD":/usr/src \
+        -v "$PWD"/composer.phar:/usr/src/composer.phar \
         -w /usr/src/ \
         php:"$PHP_VERSION"-cli \
-        php ./vendor/bin/phpunit
+        bash -c './composer.phar -n update && php ./vendor/bin/phpunit'
 
     if [ $? -eq 0 ]; then
         RESULTS="$RESULTS\n${green}✓ PHP $PHP_VERSION / PDNS: $PDNS_VERSION"
@@ -41,12 +44,17 @@ function run() {
 SET_PHP_VERSION=$1
 SET_PDNS_VERSION=$2
 
+# Grab the most recent stable composer.
+rm -f composer.phar
+curl -L -sS https://getcomposer.org/composer-stable.phar -o composer.phar
+chmod +x composer.phar
+
 # If both arguments are given, only run that combo.
 if [ "$#" -eq 2 ]; then
     run "$SET_PHP_VERSION" "$SET_PDNS_VERSION"
 else
     # Run tests for all supported PHP 7 / PowerDNS 4 combinations.
-    for phpversion in {1..4}; do
+    for phpversion in {3..4}; do
         for pdnsversion in {1..3}; do
             run "7.$phpversion" "4.$pdnsversion"
         done
diff --git a/src/Connector.php b/src/Connector.php
index f86cf9e..1c6ba55 100644
--- a/src/Connector.php
+++ b/src/Connector.php
@@ -123,7 +123,7 @@ private function makeCall(string $method, string $urlPath, ?string $payload = nu
         $stream = $payload !== null ? \GuzzleHttp\Psr7\stream_for($payload) : null;
         $request = new Request($method, $url, $headers, $stream);
 
-        $response = $this->httpClient->send($request);
+        $response = $this->httpClient->send($request, ['http_errors' => false]);
 
         return $this->parseResponse($response);
     }