diff --git a/CHANGELOG.md b/CHANGELOG.md
index dca34edc..12b61b05 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 - Enh #459: Explicitly import constants in "use" section (@mspirkov)
 - Enh #460: Remove unnecessary files from Composer package (@mspirkov)
+- Enh #461: Add `ext-pdo_mysql` to `require` section of `composer.json` (@Tigrov)
 
 ## 2.0.0 December 05, 2025
 
diff --git a/composer.json b/composer.json
index acb5c46a..513faf7a 100644
--- a/composer.json
+++ b/composer.json
@@ -34,6 +34,7 @@
         "php": "8.1 - 8.5",
         "ext-ctype": "*",
         "ext-pdo": "*",
+        "ext-pdo_mysql": "*",
         "psr/log": "^2.0|^3.0",
         "yiisoft/db": "^2.0"
     },
diff --git a/tests/DeadLockTest.php b/tests/DeadLockTest.php
index ade36946..35fdbc8c 100644
--- a/tests/DeadLockTest.php
+++ b/tests/DeadLockTest.php
@@ -283,20 +283,21 @@ private function childrenUpdateLocked(): int
             return 1;
         }
 
-        try {
-            /* at first, parent should do 1st select */
-            $this->log('child 2: wait signal from child 1');
+        /* at first, parent should do 1st select */
+        $this->log('child 2: wait signal from child 1');
 
-            if (pcntl_sigtimedwait([SIGUSR1], $info, 10) <= 0) {
-                $this->log('child 2: wait timeout exceeded');
+        if (pcntl_sigtimedwait([SIGUSR1], $info, 10) <= 0) {
+            $this->log('child 2: wait timeout exceeded');
 
-                return 1;
-            }
+            return 1;
+        }
+
+        $this->log('child 2: connect');
 
-            $this->log('child 2: connect');
+        $second = $this->createConnection();
+        $this->loadFixture(db: $second);
 
-            $second = $this->createConnection();
-            $this->loadFixture(db: $second);
+        try {
             $second->open();
 
             /* sleep(1); */