diff --git a/.travis.yml b/.travis.yml
index c41f8ef..480fccb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,9 @@
 language: php
 php:
-  - 7.0
-  - 7.1
-  - 7.2
   - 7.3
+  - 7.4
+  - 8.0
+  - 8.1
   - nightly
 env:
   - PREFER_LOWEST="--prefer-lowest --prefer-stable"
diff --git a/composer.json b/composer.json
index 11d5aae..21ed608 100644
--- a/composer.json
+++ b/composer.json
@@ -24,11 +24,11 @@
         "sort-packages": true
     },
     "require": {
-        "php": "^7.0"
+        "php": "^7.3 || ^8.0"
     },
     "require-dev": {
-        "php-coveralls/php-coveralls": "^2.1",
-        "phpunit/phpunit": "^6.0",
+        "php-coveralls/php-coveralls": "^2.4",
+        "phpunit/phpunit": "^9.0",
         "squizlabs/php_codesniffer": "^3.2"
     },
     "autoload": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 9654ad0..2d1aa6e 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,12 +1,13 @@
-<phpunit colors="true" forceCoversAnnotation="true">
-    <testsuites>
-        <testsuite name="TraderInteractive Library Test Suite">
-            <directory suffix="Test.php">tests</directory>
-        </testsuite>
-    </testsuites>
-    <filter>
-        <whitelist>
-            <directory>src</directory>
-        </whitelist>
-    </filter>
+<?xml version="1.0"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" colors="true" forceCoversAnnotation="true" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage>
+    <include>
+      <directory>src</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="TraderInteractive Library Test Suite">
+      <directory suffix="Test.php">tests</directory>
+    </testsuite>
+  </testsuites>
 </phpunit>
diff --git a/tests/ArraysTest.php b/tests/ArraysTest.php
index d307309..c8994db 100644
--- a/tests/ArraysTest.php
+++ b/tests/ArraysTest.php
@@ -155,10 +155,10 @@ public function projectBasicUse()
     /**
      * @test
      * @covers ::project
-     * @expectedException \InvalidArgumentException
      */
     public function projectStrictKeyFail()
     {
+        $this->expectException(\InvalidArgumentException::class);
         A::project([['key1' => 1, 'key2' => 2], ['key1' => 3]], 'key2');
     }
 
@@ -177,11 +177,11 @@ public function projectStrictKeyFalse()
     /**
      * @test
      * @covers ::project
-     * @expectedException \InvalidArgumentException
-     * @expectedExceptionMessage a value in $input was not an array
      */
     public function projectInputValueNotArray()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('a value in $input was not an array');
         A::project([1], 'not under test');
     }
 
@@ -288,11 +288,11 @@ public function wherePreservesOriginalKeys()
     /**
      * @test
      * @covers ::where
-     * @expectedException \InvalidArgumentException
-     * @expectedExceptionMessage a value in $array was not an array
      */
     public function whereInputValueNotArray()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('a value in $array was not an array');
         A::where([1], []);
     }
 
@@ -336,11 +336,11 @@ public function embedIntoEmptyDestination()
      *
      * @test
      * @covers ::embedInto
-     * @expectedException InvalidArgumentException
-     * @expectedExceptionMessage a value in $destination was not an array
      */
     public function embedIntoNonArrayDestinationItems()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('a value in $destination was not an array');
         A::embedInto(['one' => 0], 'result', ['one' => 0]);
     }
 
@@ -349,10 +349,10 @@ public function embedIntoNonArrayDestinationItems()
      *
      * @test
      * @covers ::embedInto
-     * @expectedException Exception
      */
     public function embedIntoExistingFieldName()
     {
+        $this->expectException(\Exception::class);
         A::embedInto(['new'], 'result', [['result' => 'old']]);
     }
 
@@ -440,11 +440,11 @@ public function extractTakeFirst()
      *
      * @test
      * @covers ::extract
-     * @expectedException \Exception
-     * @expectedExceptionMessage Duplicate entry for 'boo' found.
      */
     public function extractThrowOnDuplicate()
     {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage("Duplicate entry for 'boo' found.");
         $input = [
             ['key' => 'foo', 'value' => 'bar', 'extra' => 'abc'],
             ['extra' => 123, 'key' => 'baz', 'value' => 'fez'],
@@ -461,11 +461,11 @@ public function extractThrowOnDuplicate()
      *
      * @test
      * @covers ::extract
-     * @expectedException \InvalidArgumentException
-     * @expectedExceptionMessage $arrays was not a multi-dimensional array
      */
     public function extractWithSingleDimensionalArray()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('$arrays was not a multi-dimensional array');
         A::extract(['key' => 'foo', 'value' => 'bar', 'extra' => 'abc'], 'key', 'value');
     }
 
@@ -474,11 +474,11 @@ public function extractWithSingleDimensionalArray()
      *
      * @test
      * @covers ::extract
-     * @expectedException \UnexpectedValueException
-     * @expectedExceptionMessage Value for $arrays[1][key] was not a string or integer
      */
     public function extractWithInvalidKeyValue()
     {
+        $this->expectException(\UnexpectedValueException::class);
+        $this->expectExceptionMessage('Value for $arrays[1][key] was not a string or integer');
         $input = [
             ['key' => 'foo', 'value' => 'bar', 'extra' => 'abc'],
             ['extra' => 123, 'key' => [], 'value' => 'fez'],
@@ -492,11 +492,11 @@ public function extractWithInvalidKeyValue()
      *
      * @test
      * @covers ::extract
-     * @expectedException \InvalidArgumentException
-     * @expectedExceptionMessage $keyIndex was not a string or integer
      */
     public function extractWithInvalidKeyIndex()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('$keyIndex was not a string or integer');
         A::extract([], true, 'value');
     }
 
@@ -505,11 +505,11 @@ public function extractWithInvalidKeyIndex()
      *
      * @test
      * @covers ::extract
-     * @expectedException \InvalidArgumentException
-     * @expectedExceptionMessage $valueIndex was not a string or integer
      */
     public function extractWithInvalidValueIndex()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('$valueIndex was not a string or integer');
         A::extract([], 'key', []);
     }
 
@@ -518,11 +518,11 @@ public function extractWithInvalidValueIndex()
      *
      * @test
      * @covers ::extract
-     * @expectedException \InvalidArgumentException
-     * @expectedExceptionMessage $duplicateBehavior was not 'takeFirst', 'takeLast', or 'throw'
      */
     public function extractWithInvalidDuplicateBehavior()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage("\$duplicateBehavior was not 'takeFirst', 'takeLast', or 'throw'");
         A::extract([], 'key', 'value', 'invalid');
     }
 
@@ -619,11 +619,11 @@ public function partitionOnePartition()
      *
      * @test
      * @covers ::partition
-     * @expectedException \InvalidArgumentException
-     * @expectedExceptionMessage $partitionCount must be a positive integer
      */
     public function partitionNegativePartitionCount()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('$partitionCount must be a positive integer');
         A::partition(['a', 'b', 'c'], -1);
     }
 
@@ -632,11 +632,11 @@ public function partitionNegativePartitionCount()
      *
      * @test
      * @covers ::partition
-     * @expectedException \InvalidArgumentException
-     * @expectedExceptionMessage $partitionCount must be a positive integer
      */
     public function partitionZeroPartitionCount()
     {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('$partitionCount must be a positive integer');
         A::partition(['a', 'b', 'c'], 0);
     }
 
@@ -978,10 +978,10 @@ public function rename()
     /**
      * @test
      * @covers ::rename
-     * @expectedException InvalidArgumentException
      */
     public function renameOldKeyDoesNotExist()
     {
+        $this->expectException(\InvalidArgumentException::class);
         $input = ['id' => 1, 'data' => ['a', 'b', 'c']];
         Arrays::rename($input, 'value', 'values');
     }
@@ -989,10 +989,10 @@ public function renameOldKeyDoesNotExist()
     /**
      * @test
      * @covers ::rename
-     * @expectedException InvalidArgumentException
      */
     public function renameNewKeyExists()
     {
+        $this->expectException(\InvalidArgumentException::class);
         $input = ['id' => 1, 'values' => ['a', 'b', 'c'], 'value' => [1, 2, 3]];
         Arrays::rename($input, 'value', 'values');
     }