diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5103b78..8d03adb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- [PR-46](https://github.com/itk-dev/serviceplatformen/pull/46)
+  Update symfony/string dependency
+
 ## [1.7.2] - 2025-11-24
 
 - [PR-45](https://github.com/itk-dev/serviceplatformen/pull/45)
diff --git a/composer.json b/composer.json
index f4d60f1..8b86d1d 100644
--- a/composer.json
+++ b/composer.json
@@ -31,12 +31,12 @@
         "itk-dev/azure-key-vault-php": "^1.0",
         "jms/serializer": "^3.18",
         "php-http/guzzle7-adapter": "^1.0",
-        "symfony/cache": "^5.4 || ^6.0",
-        "symfony/http-client": "^5.4 || ^6.0",
-        "symfony/options-resolver": "^5.4 || ^6.0",
-        "symfony/property-access": "^4.4 || ^5.4 || ^6.0",
-        "symfony/string": "^5.4 || ^6.0",
-        "symfony/uid": "^5.4 || ^6.0",
+        "symfony/cache": "^5.4 || ^6.0 || ^7.0",
+        "symfony/http-client": "^5.4 || ^6.0 || ^7.0",
+        "symfony/options-resolver": "^5.4 || ^6.0 || ^7.0",
+        "symfony/property-access": "^5.4 || ^6.0 || ^7.0",
+        "symfony/string": "^5.4 || ^6.0 || ^7.0",
+        "symfony/uid": "^5.4 || ^6.0 || ^7.0",
         "wsdltophp/packagebase": "^5.0"
     },
     "require-dev": {
@@ -46,8 +46,8 @@
         "phpstan/phpstan": "^1.8",
         "phpunit/phpunit": "^9.0",
         "squizlabs/php_codesniffer": "^3.7",
-        "symfony/console": "^5.4 || ^6.0",
-        "symfony/mime": "^5.4 || ^6.0",
+        "symfony/console": "^5.4 || ^6.0 || ^7.0",
+        "symfony/mime": "^5.4 || ^6.0 || ^7.0",
         "wsdltophp/packagegenerator": "^4.1"
     },
     "config": {
diff --git a/src/Command/SF1500/SF1500LookupCommand.php b/src/Command/SF1500/SF1500LookupCommand.php
index 1ca7bb0..d27ad91 100644
--- a/src/Command/SF1500/SF1500LookupCommand.php
+++ b/src/Command/SF1500/SF1500LookupCommand.php
@@ -86,7 +86,7 @@ protected function configure()
     /**
      * @throws SF1500Exception
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $options = $this->resolveOptions(
             array_filter(array_filter($input->getOptions()), fn ($name) => isset($this->inputOptions[$name]), ARRAY_FILTER_USE_KEY)
diff --git a/src/Command/SF1500/SF1500ReadCommand.php b/src/Command/SF1500/SF1500ReadCommand.php
index 5abd8a0..4efcd2b 100644
--- a/src/Command/SF1500/SF1500ReadCommand.php
+++ b/src/Command/SF1500/SF1500ReadCommand.php
@@ -53,10 +53,10 @@ protected function configure()
     &name=organisation
     &secret=test
     &version=bbcbd812-0d7c-420b-9b93-7318e3769578
-    
+
     If using path option make sure the path is relative to project root to the certificate file, e.g.
     '/app/src/Command/SF1500/certificate.p12'
- 
+
 certificate-passphrase:
     the passphrase for p12 certificate, i.e.
     'XYZ'
@@ -79,7 +79,7 @@ protected function configure()
     /**
      * @throws SF1500Exception
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $options = $this->resolveOptions(
             array_filter(
diff --git a/src/Command/SF1500/SF1500SearchCommand.php b/src/Command/SF1500/SF1500SearchCommand.php
index 3157d32..39e46d8 100644
--- a/src/Command/SF1500/SF1500SearchCommand.php
+++ b/src/Command/SF1500/SF1500SearchCommand.php
@@ -92,7 +92,7 @@ protected function configure()
     /**
      * @throws SF1500Exception
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $options = $this->resolveOptions(
             array_filter(
diff --git a/src/Command/SF1601/KombiPostAfsendCommand.php b/src/Command/SF1601/KombiPostAfsendCommand.php
index 810aace..b0b5e55 100644
--- a/src/Command/SF1601/KombiPostAfsendCommand.php
+++ b/src/Command/SF1601/KombiPostAfsendCommand.php
@@ -131,7 +131,7 @@ protected function configure()
         $this->inputOptions = array_combine(array_map(fn (InputOption $option) => $option->getName(), $inputOptions), $inputOptions);
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $this->setLogger(new ConsoleLogger($output));
 
diff --git a/src/Command/SF1601/PostForespoergCommand.php b/src/Command/SF1601/PostForespoergCommand.php
index 03c81a3..107dd74 100644
--- a/src/Command/SF1601/PostForespoergCommand.php
+++ b/src/Command/SF1601/PostForespoergCommand.php
@@ -69,7 +69,7 @@ protected function configure()
         $this->buildInputOptions($definition);
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $options = $this->resolveOptions(
             array_filter(