diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index ece5852a056..c4c12211f67 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -128,7 +128,7 @@ jobs:
 
       - name: Setting up redis service
         run: |
-          choco install redis-64 --version 3.0.503 --no-progress
+          choco install redis --version 5.0.7 --no-progress
           nssm install redis redis-server
           nssm start redis
 
diff --git a/lib/dml/tests/dml_mysqli_read_replica_test.php b/lib/dml/tests/dml_mysqli_read_replica_test.php
index a52f7dfbb3d..6a7006ab2a1 100644
--- a/lib/dml/tests/dml_mysqli_read_replica_test.php
+++ b/lib/dml/tests/dml_mysqli_read_replica_test.php
@@ -158,19 +158,18 @@ final class dml_mysqli_read_replica_test extends \database_driver_testcase {
         $this->resetDebugging();
         $db2 = \moodle_database::get_driver_instance($cfg->dbtype, $cfg->dblibrary);
         $db2->connect($cfg->dbhost, $cfg->dbuser, $cfg->dbpass, $cfg->dbname, $cfg->prefix, $cfg->dboptions);
-        $this->assertTrue(count($db2->get_records('user')) > 0);
+        $this->assertNotEmpty($db2->get_records('user'));
 
         $debugging = array_map(function ($d) {
             return $d->message;
         }, $this->getDebuggingMessages());
         $this->resetDebugging();
-        $this->assertEquals(2, count($debugging));
+        $this->assertCount(2, $debugging);
         $this->assertMatchesRegularExpression(
             sprintf(
                 '/%s%s/',
                 preg_quote("Readonly db connection failed for host {$invalidhost}:"),
-                '.* Name or service not known',
-                $cfg->dbname
+                '.*'
             ),
             $debugging[0]
         );
@@ -214,22 +213,23 @@ final class dml_mysqli_read_replica_test extends \database_driver_testcase {
             return $d->message;
         }, $this->getDebuggingMessages());
         $this->resetDebugging();
-        $this->assertEquals(2, count($debugging));
+        $this->assertCount(2, $debugging);
+        // Read-only attempt to connect to the non-existent replica database will fail.
+        // Note: The expected regex pattern is a bit generic because the actual error message may vary between operating systems.
         $this->assertMatchesRegularExpression(
             sprintf(
                 '/%s%s/',
                 preg_quote("Readonly db connection failed for host {$cfg->dbhost}: "),
-                "Access denied for user .* to database '$invaliddb'",
-                $cfg->dbname
+                ".* database '$invaliddb'"
             ),
             $debugging[0]
         );
+        // Read-write attempt to connect to the non-existent replica database will also fail.
         $this->assertMatchesRegularExpression(
             sprintf(
                 '/%s%s/',
                 preg_quote("Readwrite db connection failed for host {$cfg->dbhost}: "),
-                'Access denied for user .* '.preg_quote("to database '$invaliddb'"),
-                $cfg->dbname
+                ".* '$invaliddb"
             ),
             $debugging[1]
         );
diff --git a/lib/dml/tests/dml_pgsql_read_replica_test.php b/lib/dml/tests/dml_pgsql_read_replica_test.php
index d164923e378..781c9e04b53 100644
--- a/lib/dml/tests/dml_pgsql_read_replica_test.php
+++ b/lib/dml/tests/dml_pgsql_read_replica_test.php
@@ -282,22 +282,24 @@ class dml_pgsql_read_replica_test extends \advanced_testcase {
         $this->resetDebugging();
         $db2 = moodle_database::get_driver_instance($cfg->dbtype, $cfg->dblibrary);
         $db2->connect($cfg->dbhost, $cfg->dbuser, $cfg->dbpass, $cfg->dbname, $cfg->prefix, $cfg->dboptions);
-        $this->assertTrue(count($db2->get_records('user')) > 0);
+        $this->assertNotEmpty($db2->get_records('user'));
 
         $debugging = array_map(function ($d) {
             return $d->message;
         }, $this->getDebuggingMessages());
         $this->resetDebugging();
-        $this->assertEquals(2, count($debugging));
+        $this->assertCount(2, $debugging);
+        // Attempt to connect to the non-existent replica host will fail.
+        // Note: The expected regex pattern is a bit generic because the actual error message may vary between operating systems.
         $this->assertMatchesRegularExpression(
             sprintf(
                 '/%s%s/',
                 preg_quote("Readonly db connection failed for host {$invalidhost}: "),
-                '.* Name or service not known',
-                $cfg->dbname
+                '.*'
             ),
             $debugging[0]
         );
+        // Attempt to connect to the existing DB host will succeed.
         $this->assertEquals("Readwrite db connection succeeded for host {$cfg->dbhost}", $debugging[1]);
     }
 }
diff --git a/lib/tests/component_test.php b/lib/tests/component_test.php
index 29f88ad1aa9..b8825588c32 100644
--- a/lib/tests/component_test.php
+++ b/lib/tests/component_test.php
@@ -1349,10 +1349,10 @@ final class component_test extends \advanced_testcase {
 
                     foreach ($paths as $path) {
                         // The composer.json can specify any arbitrary directory within the folder.
-                        // It always contains a leading slash (/).
+                        // It always contains a leading slash (/) or backslash (\) on Windows.
                         // It may also have an optional trailing slash (/).
                         // Concatenate the parts and removes the slashes.
-                        $relativenamespacepath = trim("{$relativepath}/{$path}", '/');
+                        $relativenamespacepath = trim("{$relativepath}/{$path}", '/\\');
 
                         // The Moodle PSR-4 autoloader data has two formats:
                         // - a string, for a single source; or
@@ -1377,7 +1377,7 @@ final class component_test extends \advanced_testcase {
                 // The Moodle composer file autoloads are a simple string[].
                 $autoloadnamefiles = $rc->getProperty('composerautoloadfiles')->getValue(null);
                 foreach ($composer['autoload']['files'] as $file) {
-                    $this->assertContains(trim($relativepath, '/') . "/{$file}", $autoloadnamefiles);
+                    $this->assertContains(trim($relativepath, '/\\') . "/{$file}", $autoloadnamefiles);
                 }
             }
         }