diff --git a/composer.json b/composer.json
index ab160e189..b125904a3 100644
--- a/composer.json
+++ b/composer.json
@@ -8,20 +8,20 @@
     "sweetrdf/easyrdf": "1.13.*",
     "symfony/polyfill-php80": "1.*",
     "symfony/polyfill-php81": "1.*",
-    "twig/twig": "3.8.*",
+    "twig/twig": "3.14.*",
     "willdurand/negotiation": "3.1.*",
-    "punic/punic": "3.5.1",
+    "punic/punic": "3.8.*",
     "ml/json-ld": "1.*",
     "ext-intl": "*",
     "ext-mbstring": "*",
     "ext-xsl": "*",
-    "monolog/monolog": "1.27.*",
+    "monolog/monolog": "3.7.*",
     "symfony/translation": "6.4.*",
-    "symfony/translation-contracts": "3.0.*",
+    "symfony/translation-contracts": "3.5.*",
     "symfony/twig-bundle": "6.4.*"
   },
   "require-dev": {
-    "phpunit/phpunit": "9.5.*",
+    "phpunit/phpunit": "9.6.*",
     "symfony/dom-crawler": "6.4.*",
     "symfony/config": "6.4.*",
     "symfony/runtime": "6.4.*",
@@ -30,7 +30,7 @@
     "symfony/dotenv": "6.4.*",
     "symfony/lokalise-translation-provider": "6.4.*",
     "symfony/console": "6.4.*",
-    "mockery/mockery": "1.5.1",
+    "mockery/mockery": "1.6.*",
     "friendsofphp/php-cs-fixer": "3.64.*"
   },
   "autoload": {
diff --git a/tests/ConceptPropertyValueLiteralTest.php b/tests/ConceptPropertyValueLiteralTest.php
index d87fa889f..55e0d27a6 100644
--- a/tests/ConceptPropertyValueLiteralTest.php
+++ b/tests/ConceptPropertyValueLiteralTest.php
@@ -61,11 +61,22 @@ public function testGetLabelThatIsADate()
      */
     public function testGetLabelThatIsABrokenDate()
     {
-        $this->expectWarning();
-        $vocab = $this->model->getVocabulary('dates');
-        $concept = $vocab->getConceptInfo("http://www.skosmos.skos/date/d2", "en");
-        $props = $concept->getProperties();
-        $propvals = $props['http://www.skosmos.skos/date/ownDate']->getValues();
+        set_error_handler(function ($code, $message) {
+            throw new \PHPUnit\Framework\Error($message,$code);
+        });
+
+        try {
+            $vocab = $this->model->getVocabulary('dates');
+
+            $this->expectException(\PHPUnit\Framework\Error::class);
+            $this->expectExceptionMessage("Failed to parse time string (1986-21-00) at position 6 (1): Unexpected character");
+
+            $concept = $vocab->getConceptInfo("http://www.skosmos.skos/date/d2", "en");
+            $props = $concept->getProperties();
+            $propvals = $props['http://www.skosmos.skos/date/ownDate']->getValues();
+        } finally {
+            restore_error_handler();
+        }
     }
 
     /**
diff --git a/tests/ConceptTest.php b/tests/ConceptTest.php
index 6f5550b99..b8686d61d 100644
--- a/tests/ConceptTest.php
+++ b/tests/ConceptTest.php
@@ -312,10 +312,22 @@ public function testGetDateWithCreatedAndModified()
      */
     public function testGetTimestampInvalidWarning()
     {
-        $this->expectError();
-        $vocab = $this->model->getVocabulary('test');
-        $concept = $vocab->getConceptInfo("http://www.skosmos.skos/test/ta114", "en");
-        $props = $concept->getDate(); # this should throw a E_USER_WARNING exception
+        set_error_handler(function ($code, $message) {
+            throw new \PHPUnit\Framework\Error($message, $code);
+        });
+
+        try {
+            $vocab = $this->model->getVocabulary('test');
+
+            $this->expectException(\PHPUnit\Framework\Error::class);
+            $this->expectExceptionMessage("Failed to parse time string (1986-21-00) at position 6 (1): Unexpected character");
+
+            $concept = $vocab->getConceptInfo("http://www.skosmos.skos/test/ta114", "en");
+            $concept->getDate(); # this should throw an ErrorException
+
+        } finally {
+            restore_error_handler();
+        }
     }
 
     /**
diff --git a/tests/VocabularyConfigTest.php b/tests/VocabularyConfigTest.php
index 3e4e0616a..b2cafbe31 100644
--- a/tests/VocabularyConfigTest.php
+++ b/tests/VocabularyConfigTest.php
@@ -164,10 +164,17 @@ public function testGetDefaultLanguage()
      */
     public function testGetDefaultLanguageWhenNotSet()
     {
-        $vocab = $this->model->getVocabulary('testdiff');
-        $this->expectError();
-        $this->expectErrorMessage("Default language for vocabulary 'testdiff' unknown, choosing 'en'.");
-        $lang = $vocab->getConfig()->getDefaultLanguage();
+        set_error_handler(function ($code, $message) {
+            throw new \PHPUnit\Framework\Error($message, $code);
+        });
+        try {
+            $vocab = $this->model->getVocabulary('testdiff');
+            $this->expectException(\PHPUnit\Framework\Error::class);
+            $this->expectExceptionMessage("Default language for vocabulary 'testdiff' unknown, choosing 'en'.");
+            $lang = $vocab->getConfig()->getDefaultLanguage();
+        } finally {
+            restore_error_handler();
+        }
     }
 
     /**
@@ -210,10 +217,19 @@ public function testGetDataURLs()
      */
     public function testGetDataURLsNotGuessable()
     {
-        $vocab = $this->model->getVocabulary('test');
-        $this->expectWarning();
-        $this->expectWarningMessage("Could not guess format for <http://skosmos.skos/dump/test/>.");
-        $url = $vocab->getConfig()->getDataURLs();
+        set_error_handler(function ($code, $message) {
+            throw new \PHPUnit\Framework\Error($message, $code);
+        });
+
+        try {
+            $vocab = $this->model->getVocabulary('test');
+            $this->expectException(\PHPUnit\Framework\Error::class);
+            $this->expectExceptionMessage("Could not guess format for <http://skosmos.skos/dump/test/>.");
+
+            $url = $vocab->getConfig()->getDataURLs();
+        } finally {
+            restore_error_handler();
+        }
     }
 
     /**
@@ -243,11 +259,21 @@ public function testGetDataURLsMarc()
      */
     public function testGetDataURLsMarcNotDefined()
     {
-        $vocab = $this->model->getVocabulary('marc-undefined');
-        $this->expectWarning();
-        $this->expectWarningMessage("Could not guess format for <http://skosmos.skos/dump/test/marc-undefined.mrcx>.");
-        $url = $vocab->getConfig()->getDataURLs();
-        $this->assertEquals(array(), $url);
+        set_error_handler(function ($code, $message) {
+            throw new \PHPUnit\Framework\Error($message, $code);
+        });
+
+        try {
+            $vocab = $this->model->getVocabulary('marc-undefined');
+
+            $this->expectException(\PHPUnit\Framework\Error::class);
+            $this->expectExceptionMessage("Could not guess format for <http://skosmos.skos/dump/test/marc-undefined.mrcx>.");
+
+            $url = $vocab->getConfig()->getDataURLs();
+            $this->assertEquals(array(), $url);
+        } finally {
+            restore_error_handler();
+        }
     }
 
     /**
@@ -660,11 +686,20 @@ public function testGetPropertyOrderDefault()
      */
     public function testGetPropertyOrderUnknown()
     {
-        $vocab = $this->model->getVocabulary('testUnknownPropertyOrder');
-        $this->expectWarning();
-        $this->expectWarningMessage("Property order for vocabulary 'testUnknownPropertyOrder' unknown, using default order");
-        $params = $vocab->getConfig()->getPropertyOrder();
-        $this->assertEquals(VocabularyConfig::DEFAULT_PROPERTY_ORDER, $params);
+        set_error_handler(function ($code, $message) {
+            throw new \PHPUnit\Framework\Error($message, $code);
+        });
+
+        try {
+            $vocab = $this->model->getVocabulary('testUnknownPropertyOrder');
+            $this->expectException(\PHPUnit\Framework\Error::class);
+            $this->expectExceptionMessage("Property order for vocabulary 'testUnknownPropertyOrder' unknown, using default order");
+
+            $params = $vocab->getConfig()->getPropertyOrder();
+            $this->assertEquals(VocabularyConfig::DEFAULT_PROPERTY_ORDER, $params);
+        } finally {
+            restore_error_handler();
+        }
     }
 
     /**