diff --git a/.gitattributes b/.gitattributes
index 99fda76..c3ed26d 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -4,4 +4,5 @@
 .gitignore export-ignore
 /.github export-ignore
 phpunit.xml.dist export-ignore
+phpunit10.xml.dist export-ignore
 phpcs.xml.dist export-ignore
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0fa2d1a..d648ee1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -73,9 +73,18 @@ jobs:
       - name: Lint
         run: composer phplint -- --checkstyle | cs2pr
 
-      - name: Run unit tests
+      - name: Grab PHPUnit version
+        id: phpunit_version
+        run: echo "VERSION=$(vendor/bin/phpunit --version | grep --only-matching --max-count=1 --extended-regexp '\b[0-9]+\.[0-9]+')" >> $GITHUB_OUTPUT
+
+      - name: "Run unit tests (PHPUnit < 10)"
+        if: ${{ ! startsWith( steps.phpunit_version.outputs.VERSION, '10.' ) }}
         run: composer phpunit
 
+      - name: "Run unit tests (PHPUnit 10+)"
+        if: ${{ startsWith( steps.phpunit_version.outputs.VERSION, '10.' ) }}
+        run: composer phpunit10
+
   coverage:
     needs: test
     # Don't run on forks.
@@ -124,9 +133,18 @@ jobs:
       - name: Lint
         run: composer phplint -- --checkstyle | cs2pr
 
-      - name: Run the unit tests with code coverage
+      - name: Grab PHPUnit version
+        id: phpunit_version
+        run: echo "VERSION=$(vendor/bin/phpunit --version | grep --only-matching --max-count=1 --extended-regexp '\b[0-9]+\.[0-9]+')" >> $GITHUB_OUTPUT
+
+      - name: "Run the unit tests with code coverage (PHPUnit < 10)"
+        if: ${{ ! startsWith( steps.phpunit_version.outputs.VERSION, '10.' ) }}
         run: composer coverage
 
+      - name: "Run the unit tests with code coverage (PHPUnit 10+)"
+        if: ${{ startsWith( steps.phpunit_version.outputs.VERSION, '10.' ) }}
+        run: composer coverage10
+
       - name: Upload coverage results to Coveralls
         if: ${{ success() }}
         uses: coverallsapp/github-action@v2
diff --git a/.gitignore b/.gitignore
index 468ad40..de58d45 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 /vendor/
 /composer.lock
 phpunit.xml
+phpunit10.xml
 .phpunit.result.cache
 .phpcs.xml
 phpcs.xml
diff --git a/composer.json b/composer.json
index 3e77214..85b11fa 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,7 @@
         "php-parallel-lint/php-console-color": "^1.0.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8.36 || ^5.7.21 || ^6.0 || ^7.0 || ^8.0 || ^9.0",
+        "phpunit/phpunit": "^4.8.36 || ^5.7.21 || ^6.0 || ^7.0 || ^8.0 || ^9.0 || ^10.1",
         "php-parallel-lint/php-parallel-lint": "^1.0",
         "php-parallel-lint/php-var-dump-check": "0.*",
         "php-parallel-lint/php-code-style": "^2.0"
@@ -55,9 +55,15 @@
         "phpunit": [
             "@php ./vendor/phpunit/phpunit/phpunit --no-coverage"
         ],
+        "phpunit10": [
+            "@php ./vendor/phpunit/phpunit/phpunit -c phpunit10.xml.dist --no-coverage"
+        ],
         "coverage": [
             "@php ./vendor/phpunit/phpunit/phpunit"
         ],
+        "coverage10": [
+            "@php ./vendor/phpunit/phpunit/phpunit -c phpunit10.xml.dist"
+        ],
         "build": [
             "@phplint",
             "@vardumpcheck",
@@ -70,8 +76,10 @@
         "vardumpcheck": "Check PHP files for forgotten variable dumps",
         "phpcs": "Check PHP code style",
         "fixcs": "Auto-fix PHP code style",
-        "phpunit": "PHP unit",
-        "coverage": "PHP unit with code coverage",
+        "phpunit": "Run the unit tests on PHPUnit 4.x - 9.x without code coverage.",
+        "phpunit10": "Run the unit tests on PHPUnit 10.x without code coverage.",
+        "coverage": "Run the unit tests on PHPUnit 4.x - 9.x with code coverage.",
+        "coverage10": "Run the unit tests on PHPUnit 10.x with code coverage.",
         "build": "Run all checks"
     }
 }
diff --git a/phpunit10.xml.dist b/phpunit10.xml.dist
new file mode 100644
index 0000000..065f3e1
--- /dev/null
+++ b/phpunit10.xml.dist
@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/10.1/phpunit.xsd"
+        backupGlobals="true"
+        beStrictAboutTestsThatDoNotTestAnything="true"
+        bootstrap="./vendor/autoload.php"
+        colors="true"
+        displayDetailsOnTestsThatTriggerErrors="true"
+        displayDetailsOnTestsThatTriggerWarnings="true"
+        displayDetailsOnTestsThatTriggerNotices="true"
+        displayDetailsOnTestsThatTriggerDeprecations="true"
+        displayDetailsOnIncompleteTests="true"
+        displayDetailsOnSkippedTests="true"
+        failOnWarning="true"
+        failOnNotice="true"
+        failOnDeprecation="true"
+        requireCoverageMetadata="true"
+    >
+
+    <testsuites>
+        <testsuite name="PHP-Console-Highlighter">
+            <directory suffix="Test.php">tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <source>
+        <include>
+            <directory suffix=".php">./src/</directory>
+        </include>
+    </source>
+
+    <coverage includeUncoveredFiles="true" ignoreDeprecatedCodeUnits="true">
+        <report>
+            <clover outputFile="build/logs/clover.xml"/>
+            <html outputDirectory="build/coverage/"/>
+            <text outputFile="php://stdout" showOnlySummary="true"/>
+        </report>
+    </coverage>
+
+    <php>
+        <ini name="memory_limit" value="256M"/>
+    </php>
+</phpunit>