diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7c5b7e8..414cddb 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -18,7 +18,7 @@ jobs:
           - php-version: 8.2
             phing_tasks: "phpunitfast"
           - php-version: 8.3
-            phing_tasks: "phpunitfast phpcs-console php-cs-fixer-dryrun phpstan-console"
+            phing_tasks: "phpunitfast phpcs-console php-cs-fixer-dryrun phpstan-console rector-console"
 
     steps:
       - name: Setup PHP
@@ -27,6 +27,13 @@ jobs:
           php-version: ${{ matrix.php-version }}
           extensions: intl, xsl
 
+      - name: Cache rector data
+        uses: actions/cache@v4
+        with:
+          path: .rector
+          key: "php-${{ matrix.php-version }}-rector-${{ github.sha }}"
+          restore-keys: "php-${{ matrix.php-version }}-rector-"
+
       - name: Checkout
         uses: actions/checkout@v4
 
diff --git a/.gitignore b/.gitignore
index 2b1aafc..2f6a1d0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ composer.lock
 .php_cs_cache
 .phpstan_cache
 .phpunit.result.cache
+.rector
diff --git a/build.xml b/build.xml
index 08c5a01..161e43f 100644
--- a/build.xml
+++ b/build.xml
@@ -38,6 +38,7 @@
     <phingcall target="phpmd"/>
     <phingcall target="pdepend"/>
     <phingcall target="phpstan-checkstyle"/>
+    <phingcall target="rector-console"/>
   </target>
 
   <!-- Report rule violations with PHPMD (mess detector) -->
@@ -139,6 +140,18 @@
     </exec>  
   </target>
 
+  <!-- Rector -->
+  <target name="rector-console">
+    <exec executable="${srcdir}/vendor/bin/rector" escape="false" passthru="true" checkreturn="true">
+      <arg line="--config=${srcdir}/tests/rector.php --dry-run" />
+    </exec>
+  </target>
+  <target name="rector">
+    <exec executable="${srcdir}/vendor/bin/rector" escape="false" passthru="true" checkreturn="true">
+      <arg line="--config=${srcdir}/tests/rector.php" />
+    </exec>
+  </target>
+
   <!-- PHPUnit without logging output -->
   <target name="phpunitfast" description="Run tests">
     <exec dir="${srcdir}" executable="${sh}" passthru="true" checkreturn="true">
diff --git a/composer.json b/composer.json
index d2b13c6..0293374 100644
--- a/composer.json
+++ b/composer.json
@@ -36,7 +36,8 @@
         "phpstan/phpstan": "1.12.7",
         "phpunit/phpunit": "10.5.36",
         "phing/phing": "3.0",
-        "squizlabs/php_codesniffer": "3.10.3"
+        "squizlabs/php_codesniffer": "3.10.3",
+        "rector/rector": "^1.2"
     },
     "autoload": {
         "psr-0": {
diff --git a/src/VuFindHttp/HttpService.php b/src/VuFindHttp/HttpService.php
index 27c0568..97127f9 100644
--- a/src/VuFindHttp/HttpService.php
+++ b/src/VuFindHttp/HttpService.php
@@ -201,7 +201,7 @@ public function get(
         $timeout = null,
         array $headers = []
     ) {
-        if ($params) {
+        if ($params !== []) {
             $query = $this->createQueryString($params);
             if (str_contains($url, '?')) {
                 $url .= '&' . $query;
@@ -211,7 +211,7 @@ public function get(
         }
         $client
             = $this->createClient($url, \Laminas\Http\Request::METHOD_GET, $timeout);
-        if ($headers) {
+        if ($headers !== []) {
             $client->setHeaders($headers);
         }
         return $this->send($client);
diff --git a/tests/phpcs.xml b/tests/phpcs.xml
index 55f14a4..12dbbf9 100644
--- a/tests/phpcs.xml
+++ b/tests/phpcs.xml
@@ -5,6 +5,7 @@
   <file>.</file>
   <exclude-pattern>*/config/*</exclude-pattern>
   <exclude-pattern>*.php-cs-fixer.*</exclude-pattern>
+  <exclude-pattern>*rector.*</exclude-pattern>
   <arg name="extensions" value="php"/>
   <!-- We only use PEAR to ensure complete comments at this time -->
   <rule ref="PEAR.Commenting">
diff --git a/tests/rector.php b/tests/rector.php
new file mode 100644
index 0000000..926d1d9
--- /dev/null
+++ b/tests/rector.php
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Caching\ValueObject\Storage\FileCacheStorage;
+use Rector\Config\RectorConfig;
+use Rector\PHPUnit\Set\PHPUnitSetList;
+
+return RectorConfig::configure()
+    ->withCache(
+        cacheClass: FileCacheStorage::class,
+        cacheDirectory: __DIR__ . '/../.rector'
+    )->withPaths([
+        __DIR__ . '/../src',
+    ])
+    ->withSets([
+        PHPUnitSetList::ANNOTATIONS_TO_ATTRIBUTES,
+    ])
+    ->withTypeCoverageLevel(0)
+    ->withDeadCodeLevel(6)
+    ->withCodeQualityLevel(24);