diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a9962cf..f56c25e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,7 +11,7 @@ on:
 env:
   extensions: 'json'
   cache-version: '1'
-  composer-version: 'v1'
+  composer-version: 'v2'
   composer-install: 'composer update --no-interaction --no-progress --no-suggest --prefer-dist --prefer-stable'
 
 jobs:
@@ -21,13 +21,13 @@ jobs:
 
     strategy:
       matrix:
-        php-version: [ '8.1', '8.2' ]
+        php-version: [ '8.1', '8.2', '8.3', '8.4' ]
         operating-system: [ 'ubuntu-latest' ]
       fail-fast: false
 
     steps:
       - name: 'Checkout'
-        uses: 'actions/checkout@v2'
+        uses: 'actions/checkout@v4'
 
       - name: 'Setup PHP cache environment'
         id: 'extcache'
@@ -38,7 +38,7 @@ jobs:
           key: '${{ env.cache-version }}'
 
       - name: 'Cache PHP extensions'
-        uses: 'actions/cache@v2'
+        uses: 'actions/cache@v4'
         with:
           path: '${{ steps.extcache.outputs.dir }}'
           key: '${{ steps.extcache.outputs.key }}'
@@ -56,10 +56,10 @@ jobs:
 
       - name: 'Get Composer cache directory'
         id: 'composercache'
-        run: 'echo "::set-output name=dir::$(composer config cache-files-dir)"'
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
 
       - name: 'Cache PHP dependencies'
-        uses: "actions/cache@v2"
+        uses: "actions/cache@v4"
         with:
           path: '${{ steps.composercache.outputs.dir }}'
           key: "${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}"
@@ -80,13 +80,13 @@ jobs:
 
     strategy:
       matrix:
-        php-version: [ '8.1', '8.2' ]
+        php-version: [ '8.1', '8.2', '8.3', '8.4' ]
         operating-system: [ 'ubuntu-latest' ]
       fail-fast: false
 
     steps:
       - name: 'Checkout'
-        uses: 'actions/checkout@v2'
+        uses: 'actions/checkout@v4'
 
       - name: 'Setup PHP cache environment'
         id: 'extcache'
@@ -97,7 +97,7 @@ jobs:
           key: '${{ env.cache-version }}'
 
       - name: 'Cache PHP extensions'
-        uses: 'actions/cache@v2'
+        uses: 'actions/cache@v4'
         with:
           path: '${{ steps.extcache.outputs.dir }}'
           key: '${{ steps.extcache.outputs.key }}'
@@ -115,10 +115,10 @@ jobs:
 
       - name: 'Get Composer cache directory'
         id: 'composercache'
-        run: 'echo "::set-output name=dir::$(composer config cache-files-dir)"'
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
 
       - name: 'Cache PHP dependencies'
-        uses: 'actions/cache@v2'
+        uses: 'actions/cache@v4'
         with:
           path: '${{ steps.composercache.outputs.dir }}'
           key: "${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}"
@@ -136,15 +136,14 @@ jobs:
 
     strategy:
       matrix:
-        php-version: [ '8.1', '8.2' ]
+        php-version: [ '8.1', '8.2', '8.3', '8.4' ]
         operating-system: [ 'ubuntu-latest' ]
         composer-args: [ '' ]
-
       fail-fast: false
 
     steps:
       - name: 'Checkout'
-        uses: 'actions/checkout@v2'
+        uses: 'actions/checkout@v4'
 
       - name: 'Setup PHP cache environment'
         id: 'extcache'
@@ -155,7 +154,7 @@ jobs:
           key: '${{ env.cache-version }}'
 
       - name: 'Cache PHP extensions'
-        uses: 'actions/cache@v2'
+        uses: 'actions/cache@v4'
         with:
           path: '${{ steps.extcache.outputs.dir }}'
           key: '${{ steps.extcache.outputs.key }}'
@@ -173,10 +172,10 @@ jobs:
 
       - name: 'Get Composer cache directory'
         id: 'composercache'
-        run: 'echo "::set-output name=dir::$(composer config cache-files-dir)"'
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
 
       - name: 'Cache PHP dependencies'
-        uses: 'actions/cache@v2'
+        uses: 'actions/cache@v4'
         with:
           path: '${{ steps.composercache.outputs.dir }}'
           key: "${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}"
@@ -194,7 +193,7 @@ jobs:
 
     strategy:
       matrix:
-        php-version: [ '8.1', '8.2' ]
+        php-version: [ '8.1', '8.2', '8.3', '8.4' ]
         operating-system: [ 'ubuntu-latest' ]
       fail-fast: false
 
@@ -202,7 +201,7 @@ jobs:
 
     steps:
       - name: 'Checkout'
-        uses: 'actions/checkout@v2'
+        uses: 'actions/checkout@v4'
 
       - name: 'Setup PHP cache environment'
         id: 'extcache'
@@ -213,7 +212,7 @@ jobs:
           key: '${{ env.cache-version }}'
 
       - name: 'Cache PHP extensions'
-        uses: 'actions/cache@v2'
+        uses: 'actions/cache@v4'
         with:
           path: '${{ steps.extcache.outputs.dir }}'
           key: '${{ steps.extcache.outputs.key }}'
@@ -231,10 +230,10 @@ jobs:
 
       - name: 'Get Composer cache directory'
         id: 'composercache'
-        run: 'echo "::set-output name=dir::$(composer config cache-files-dir)"'
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
 
       - name: 'Cache PHP dependencies'
-        uses: 'actions/cache@v2'
+        uses: 'actions/cache@v4'
         with:
           path: '${{ steps.composercache.outputs.dir }}'
           key: "${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}"
@@ -246,7 +245,7 @@ jobs:
       - name: 'Tests'
         run: vendor/bin/tester tests -C --coverage coverage.xml --coverage-src src
 
-      - uses: codecov/codecov-action@v1
+      - uses: codecov/codecov-action@v3
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true
diff --git a/docs/en/index.md b/docs/en/index.md
index c1e6776..e40a9ca 100644
--- a/docs/en/index.md
+++ b/docs/en/index.md
@@ -125,6 +125,20 @@ $httpRequest = HttpRequest::from('https://www.example.com/', HttpMethod::GET, [
 ]);
 ```
 
+Option `verify` can be set by boolean value or by specifying path to accepted certificate file.
+
+```php
+$httpRequest = HttpRequest::from('https://www.example.com/', HttpMethod::GET, [
+	'verify' => false,
+]);
+```
+
+```php
+$httpRequest = HttpRequest::from('https://www.example.com/', HttpMethod::GET, [
+	'verify' => 'path/to/some/accepted/certificate.crt',
+]);
+```
+
 ## Redirects
 
 
diff --git a/src/Fapi/HttpClient/GuzzleHttpClient.php b/src/Fapi/HttpClient/GuzzleHttpClient.php
old mode 100644
new mode 100755
index 62f1dde..f44f897
--- a/src/Fapi/HttpClient/GuzzleHttpClient.php
+++ b/src/Fapi/HttpClient/GuzzleHttpClient.php
@@ -104,8 +104,14 @@ private function processOptions(RequestInterface $request): array
 			$options['connect_timeout'] = (int) ($headerLine !== '' ? $headerLine : 5);
 		}
 
-		if ($request->hasHeader('verify') && !(bool) $request->getHeaderLine('verify')) {
-			$options['verify'] = false;
+		if ($request->hasHeader('verify')) {
+			$headerLine = $request->getHeaderLine('verify');
+
+			$options['verify'] = match ($headerLine) {
+				'false', '' => false,
+				'true', '1' => true,
+				default => $headerLine,
+			};
 		}
 
 		if ($request->hasHeader('cert')) {
diff --git a/src/Fapi/HttpClient/HttpRequest.php b/src/Fapi/HttpClient/HttpRequest.php
old mode 100644
new mode 100755
index 810116c..663fd5f
--- a/src/Fapi/HttpClient/HttpRequest.php
+++ b/src/Fapi/HttpClient/HttpRequest.php
@@ -108,7 +108,11 @@ private static function preProcessHeaders(array $options, StreamInterface|string
 		if (isset($options['verify'])) {
 			$value = $options['verify'];
 			self::validateVerify($value);
-			$data['verify'] = (bool) $value;
+			if (is_bool($value)) {
+				$value = $value ? 'true' : 'false';
+			}
+
+			$data['verify'] = $value;
 		}
 
 		if (isset($options['cert'])) {
@@ -211,8 +215,10 @@ private static function validateConnectTimeoutOption(mixed $connectTimeout): voi
 
 	private static function validateVerify(mixed $verify): void
 	{
-		if (!is_bool($verify)) {
-			throw new InvalidArgumentException('Option verify must be an bool.');
+		if (!(is_bool($verify) || (is_string($verify) && file_exists($verify)))) {
+			throw new InvalidArgumentException(
+				'Option verify must be an bool or a string path to file, ' . $verify . ' given.',
+			);
 		}
 	}