diff --git a/lizmap/modules/lizmap/lib/Commands/ProjectLoad.php b/lizmap/modules/lizmap/lib/Commands/ProjectLoad.php
index b4323b4289..b22d3de51f 100644
--- a/lizmap/modules/lizmap/lib/Commands/ProjectLoad.php
+++ b/lizmap/modules/lizmap/lib/Commands/ProjectLoad.php
@@ -34,7 +34,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             return 1;
         }
         $checker = new \Lizmap\CliHelpers\RepositoryWMSChecker();
-        $checker->checkAllRepository($nb, function ($str) use ($output) {$output->writeln($str); });
+        $checker->checkAllRepository($nb, function ($str) use ($output): void {$output->writeln($str); });
 
         return 0;
     }
diff --git a/lizmap/modules/lizmap/lib/Commands/WMTSCacheClean.php b/lizmap/modules/lizmap/lib/Commands/WMTSCacheClean.php
index 136d0a446d..5b95366a02 100644
--- a/lizmap/modules/lizmap/lib/Commands/WMTSCacheClean.php
+++ b/lizmap/modules/lizmap/lib/Commands/WMTSCacheClean.php
@@ -27,7 +27,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $fakeServer = new \Jelix\FakeServerConf\ApacheMod(\jApp::wwwPath(), '/index.php');
         $fakeServer->setHttpRequest($req->getServerURI());
 
-        $WMTSCache = new \Lizmap\CliHelpers\WMTSCache(function ($str) use ($output) {$output->writeln($str); });
+        $WMTSCache = new \Lizmap\CliHelpers\WMTSCache(function ($str) use ($output): void {$output->writeln($str); });
         $WMTSCache->clean(
             $input->getArgument('repository'),
             $input->getArgument('project'),
diff --git a/lizmap/modules/lizmap/lib/Commands/WMTSCapabilities.php b/lizmap/modules/lizmap/lib/Commands/WMTSCapabilities.php
index c078eaca5f..a86dc77cad 100644
--- a/lizmap/modules/lizmap/lib/Commands/WMTSCapabilities.php
+++ b/lizmap/modules/lizmap/lib/Commands/WMTSCapabilities.php
@@ -29,7 +29,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $fakeServer = new \Jelix\FakeServerConf\ApacheMod(\jApp::wwwPath(), '/index.php');
         $fakeServer->setHttpRequest($req->getServerURI());
 
-        $WMTSCache = new \Lizmap\CliHelpers\WMTSCache(function ($str) use ($output) {$output->writeln($str); });
+        $WMTSCache = new \Lizmap\CliHelpers\WMTSCache(function ($str) use ($output): void {$output->writeln($str); });
 
         return $WMTSCache->capabilities(
             $input->getArgument('repository'),
diff --git a/lizmap/modules/lizmap/lib/Commands/WMTSSeed.php b/lizmap/modules/lizmap/lib/Commands/WMTSSeed.php
index dcc29ca888..8609985c3b 100644
--- a/lizmap/modules/lizmap/lib/Commands/WMTSSeed.php
+++ b/lizmap/modules/lizmap/lib/Commands/WMTSSeed.php
@@ -46,7 +46,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
             return 1;
         }
-        $WMTSCache = new \Lizmap\CliHelpers\WMTSCache(function ($str) use ($output) {$output->writeln($str); });
+        $WMTSCache = new \Lizmap\CliHelpers\WMTSCache(function ($str) use ($output): void {$output->writeln($str); });
 
         return $WMTSCache->seed(
             $input->getArgument('repository'),
diff --git a/tests/units/testslib/ContextForTests.php b/tests/units/testslib/ContextForTests.php
index c072c1b395..3fe3e6d158 100644
--- a/tests/units/testslib/ContextForTests.php
+++ b/tests/units/testslib/ContextForTests.php
@@ -214,7 +214,7 @@ public function getUrl($selector, $params = array())
     {
         // simple url build
         $keyWithVal4QueryString = array();
-        array_walk($params, function($v ,$key) use (&$keyWithVal4QueryString) {$keyWithVal4QueryString[]=$key.'='.$v;});
+        array_walk($params, function($v ,$key) use (&$keyWithVal4QueryString): void {$keyWithVal4QueryString[]=$key.'='.$v;});
         return $selector.'?'.implode("&", $keyWithVal4QueryString);
     }