diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 93ce61cc18..5aa50094bf 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -20,7 +20,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - php: '7.4'
+          - php: '7.2'
           - php: '8.0'
           - php: '7.4'
             mode: high-deps
@@ -203,7 +203,7 @@ jobs:
           [[ ! $X ]] || (exit 1)
 
       - name: Run tests with SIGCHLD enabled PHP
-        if: "${{ matrix.php == '7.4' && ! matrix.mode }}"
+        if: "${{ matrix.php == '7.2' && ! matrix.mode }}"
         run: |
           mkdir build
           cd build
diff --git a/src/Symfony/Component/String/Tests/AbstractAsciiTestCase.php b/src/Symfony/Component/String/Tests/AbstractAsciiTestCase.php
index d9598d7363..70e4ba311d 100644
--- a/src/Symfony/Component/String/Tests/AbstractAsciiTestCase.php
+++ b/src/Symfony/Component/String/Tests/AbstractAsciiTestCase.php
@@ -36,6 +36,8 @@ abstract class AbstractAsciiTestCase extends TestCase
 
     /**
      * @dataProvider provideBytesAt
+     *
+     * @requires extension intl 66.2
      */
     public function testBytesAt(array $expected, string $string, int $offset, int $form = null)
     {
@@ -157,6 +159,8 @@ abstract class AbstractAsciiTestCase extends TestCase
 
     /**
      * @dataProvider provideLength
+     *
+     * @requires extension intl 66.2
      */
     public function testLength(int $length, string $string)
     {
diff --git a/src/Symfony/Component/String/Tests/AbstractUnicodeTestCase.php b/src/Symfony/Component/String/Tests/AbstractUnicodeTestCase.php
index 5617bc051e..0f2a58404c 100644
--- a/src/Symfony/Component/String/Tests/AbstractUnicodeTestCase.php
+++ b/src/Symfony/Component/String/Tests/AbstractUnicodeTestCase.php
@@ -57,6 +57,8 @@ abstract class AbstractUnicodeTestCase extends AbstractAsciiTestCase
 
     /**
      * @dataProvider provideCodePointsAt
+     *
+     * @requires extension intl 66.2
      */
     public function testCodePointsAt(array $expected, string $string, int $offset, int $form = null)
     {