diff --git a/examples/fetching-examples.php b/examples/fetching-examples.php
index 3bf0b694..753738d0 100644
--- a/examples/fetching-examples.php
+++ b/examples/fetching-examples.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 if (@!include __DIR__ . '/../vendor/autoload.php') {
 	die('Install dependencies using `composer install --dev`');
 }
diff --git a/examples/result-set-data-types.php b/examples/result-set-data-types.php
index 54ce8b00..3517f59d 100644
--- a/examples/result-set-data-types.php
+++ b/examples/result-set-data-types.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Dibi\Type;
 
 if (@!include __DIR__ . '/../vendor/autoload.php') {
diff --git a/examples/tracy-and-exceptions.php b/examples/tracy-and-exceptions.php
index f0c0750e..e1e4b08a 100644
--- a/examples/tracy-and-exceptions.php
+++ b/examples/tracy-and-exceptions.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 if (@!include __DIR__ . '/../vendor/autoload.php') {
 	die('Install dependencies using `composer install --dev`');
 }
diff --git a/examples/tracy.php b/examples/tracy.php
index 537652c6..8348f3f0 100644
--- a/examples/tracy.php
+++ b/examples/tracy.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 if (@!include __DIR__ . '/../vendor/autoload.php') {
 	die('Install dependencies using `composer install --dev`');
 }
diff --git a/examples/using-extension-methods.php b/examples/using-extension-methods.php
index c424d26f..bb962c61 100644
--- a/examples/using-extension-methods.php
+++ b/examples/using-extension-methods.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 if (@!include __DIR__ . '/../vendor/autoload.php') {
 	die('Install dependencies using `composer install --dev`');
 }
diff --git a/src/Dibi/Bridges/Nette/DibiExtension22.php b/src/Dibi/Bridges/Nette/DibiExtension22.php
index a58411cc..47ef4d57 100644
--- a/src/Dibi/Bridges/Nette/DibiExtension22.php
+++ b/src/Dibi/Bridges/Nette/DibiExtension22.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Bridges\Nette;
 
 use Dibi;
diff --git a/src/Dibi/Bridges/Tracy/Panel.php b/src/Dibi/Bridges/Tracy/Panel.php
index 4bcbab38..1f10c05a 100644
--- a/src/Dibi/Bridges/Tracy/Panel.php
+++ b/src/Dibi/Bridges/Tracy/Panel.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Bridges\Tracy;
 
 use Dibi;
diff --git a/src/Dibi/Connection.php b/src/Dibi/Connection.php
index 6e53d2d7..87f11b77 100644
--- a/src/Dibi/Connection.php
+++ b/src/Dibi/Connection.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 use Traversable;
diff --git a/src/Dibi/DataSource.php b/src/Dibi/DataSource.php
index 3d62a94a..418a4acb 100644
--- a/src/Dibi/DataSource.php
+++ b/src/Dibi/DataSource.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/DateTime.php b/src/Dibi/DateTime.php
index 21f120de..2b26341d 100644
--- a/src/Dibi/DateTime.php
+++ b/src/Dibi/DateTime.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/Drivers/FirebirdDriver.php b/src/Dibi/Drivers/FirebirdDriver.php
index bca253c5..1375727f 100644
--- a/src/Dibi/Drivers/FirebirdDriver.php
+++ b/src/Dibi/Drivers/FirebirdDriver.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/MsSqlDriver.php b/src/Dibi/Drivers/MsSqlDriver.php
index 27c0b7d8..dfe4cf5d 100644
--- a/src/Dibi/Drivers/MsSqlDriver.php
+++ b/src/Dibi/Drivers/MsSqlDriver.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/MsSqlReflector.php b/src/Dibi/Drivers/MsSqlReflector.php
index e36e834e..71576bfb 100644
--- a/src/Dibi/Drivers/MsSqlReflector.php
+++ b/src/Dibi/Drivers/MsSqlReflector.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/MySqlReflector.php b/src/Dibi/Drivers/MySqlReflector.php
index a43c615d..c5b73198 100644
--- a/src/Dibi/Drivers/MySqlReflector.php
+++ b/src/Dibi/Drivers/MySqlReflector.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/MySqliDriver.php b/src/Dibi/Drivers/MySqliDriver.php
index 5ee7c27b..e261b790 100644
--- a/src/Dibi/Drivers/MySqliDriver.php
+++ b/src/Dibi/Drivers/MySqliDriver.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/OdbcDriver.php b/src/Dibi/Drivers/OdbcDriver.php
index 65ca0c01..2e0141b3 100644
--- a/src/Dibi/Drivers/OdbcDriver.php
+++ b/src/Dibi/Drivers/OdbcDriver.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/OracleDriver.php b/src/Dibi/Drivers/OracleDriver.php
index 26e83b29..028bab20 100644
--- a/src/Dibi/Drivers/OracleDriver.php
+++ b/src/Dibi/Drivers/OracleDriver.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/PdoDriver.php b/src/Dibi/Drivers/PdoDriver.php
index b11f1fe6..a4892550 100644
--- a/src/Dibi/Drivers/PdoDriver.php
+++ b/src/Dibi/Drivers/PdoDriver.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/PostgreDriver.php b/src/Dibi/Drivers/PostgreDriver.php
index 42df416a..ac8fe54f 100644
--- a/src/Dibi/Drivers/PostgreDriver.php
+++ b/src/Dibi/Drivers/PostgreDriver.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/Sqlite3Driver.php b/src/Dibi/Drivers/Sqlite3Driver.php
index 5c95e570..573a0a72 100644
--- a/src/Dibi/Drivers/Sqlite3Driver.php
+++ b/src/Dibi/Drivers/Sqlite3Driver.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/SqliteReflector.php b/src/Dibi/Drivers/SqliteReflector.php
index b9f260cc..6072a562 100644
--- a/src/Dibi/Drivers/SqliteReflector.php
+++ b/src/Dibi/Drivers/SqliteReflector.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/SqlsrvDriver.php b/src/Dibi/Drivers/SqlsrvDriver.php
index 1c292bca..eb11418f 100644
--- a/src/Dibi/Drivers/SqlsrvDriver.php
+++ b/src/Dibi/Drivers/SqlsrvDriver.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Drivers/SqlsrvReflector.php b/src/Dibi/Drivers/SqlsrvReflector.php
index 81393042..7893de72 100644
--- a/src/Dibi/Drivers/SqlsrvReflector.php
+++ b/src/Dibi/Drivers/SqlsrvReflector.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Drivers;
 
 use Dibi;
diff --git a/src/Dibi/Event.php b/src/Dibi/Event.php
index cb748341..8bedca6c 100644
--- a/src/Dibi/Event.php
+++ b/src/Dibi/Event.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/Fluent.php b/src/Dibi/Fluent.php
index 114a0e91..f5e4cce8 100644
--- a/src/Dibi/Fluent.php
+++ b/src/Dibi/Fluent.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/HashMap.php b/src/Dibi/HashMap.php
index c803e52d..f7607d82 100644
--- a/src/Dibi/HashMap.php
+++ b/src/Dibi/HashMap.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/Helpers.php b/src/Dibi/Helpers.php
index dbf83840..cb081199 100644
--- a/src/Dibi/Helpers.php
+++ b/src/Dibi/Helpers.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/Literal.php b/src/Dibi/Literal.php
index 6f9d8500..ba7844fc 100644
--- a/src/Dibi/Literal.php
+++ b/src/Dibi/Literal.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/Loggers/FileLogger.php b/src/Dibi/Loggers/FileLogger.php
index 23103d1f..3f70f9b8 100644
--- a/src/Dibi/Loggers/FileLogger.php
+++ b/src/Dibi/Loggers/FileLogger.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Loggers;
 
 use Dibi;
diff --git a/src/Dibi/Loggers/FirePhpLogger.php b/src/Dibi/Loggers/FirePhpLogger.php
index deb13fd8..48c9c64c 100644
--- a/src/Dibi/Loggers/FirePhpLogger.php
+++ b/src/Dibi/Loggers/FirePhpLogger.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Loggers;
 
 use Dibi;
diff --git a/src/Dibi/Reflection/Column.php b/src/Dibi/Reflection/Column.php
index fe897b8c..2213b49a 100644
--- a/src/Dibi/Reflection/Column.php
+++ b/src/Dibi/Reflection/Column.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Reflection;
 
 use Dibi;
diff --git a/src/Dibi/Reflection/Database.php b/src/Dibi/Reflection/Database.php
index 8667e037..be7f6821 100644
--- a/src/Dibi/Reflection/Database.php
+++ b/src/Dibi/Reflection/Database.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Reflection;
 
 use Dibi;
diff --git a/src/Dibi/Reflection/ForeignKey.php b/src/Dibi/Reflection/ForeignKey.php
index 4d6d0b0c..ad267d2c 100644
--- a/src/Dibi/Reflection/ForeignKey.php
+++ b/src/Dibi/Reflection/ForeignKey.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Reflection;
 
 use Dibi;
diff --git a/src/Dibi/Reflection/Index.php b/src/Dibi/Reflection/Index.php
index e01f9279..ac98acfe 100644
--- a/src/Dibi/Reflection/Index.php
+++ b/src/Dibi/Reflection/Index.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Reflection;
 
 use Dibi;
diff --git a/src/Dibi/Reflection/Result.php b/src/Dibi/Reflection/Result.php
index d223d9f9..44e90629 100644
--- a/src/Dibi/Reflection/Result.php
+++ b/src/Dibi/Reflection/Result.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Reflection;
 
 use Dibi;
diff --git a/src/Dibi/Reflection/Table.php b/src/Dibi/Reflection/Table.php
index fabbe517..5456a5c9 100644
--- a/src/Dibi/Reflection/Table.php
+++ b/src/Dibi/Reflection/Table.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi\Reflection;
 
 use Dibi;
diff --git a/src/Dibi/Result.php b/src/Dibi/Result.php
index 5458eeb9..8214879a 100644
--- a/src/Dibi/Result.php
+++ b/src/Dibi/Result.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/ResultIterator.php b/src/Dibi/ResultIterator.php
index e452c6d2..cfc5c90a 100644
--- a/src/Dibi/ResultIterator.php
+++ b/src/Dibi/ResultIterator.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/Row.php b/src/Dibi/Row.php
index adf3980c..881daf7b 100644
--- a/src/Dibi/Row.php
+++ b/src/Dibi/Row.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/Strict.php b/src/Dibi/Strict.php
index befbf390..34db31ec 100644
--- a/src/Dibi/Strict.php
+++ b/src/Dibi/Strict.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 use ReflectionClass;
diff --git a/src/Dibi/Translator.php b/src/Dibi/Translator.php
index 06953e7c..95565548 100644
--- a/src/Dibi/Translator.php
+++ b/src/Dibi/Translator.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/Type.php b/src/Dibi/Type.php
index f6c40e8e..a2cc9a07 100644
--- a/src/Dibi/Type.php
+++ b/src/Dibi/Type.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/dibi.php b/src/Dibi/dibi.php
index 580646f6..2fab42f8 100644
--- a/src/Dibi/dibi.php
+++ b/src/Dibi/dibi.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 use Dibi\Type;
 
 
diff --git a/src/Dibi/exceptions.php b/src/Dibi/exceptions.php
index a3ba981e..b9a7b686 100644
--- a/src/Dibi/exceptions.php
+++ b/src/Dibi/exceptions.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/src/Dibi/interfaces.php b/src/Dibi/interfaces.php
index 63d1de09..243aa953 100644
--- a/src/Dibi/interfaces.php
+++ b/src/Dibi/interfaces.php
@@ -5,6 +5,8 @@
  * Copyright (c) 2005 David Grudl (https://davidgrudl.com)
  */
 
+declare(strict_types=1);
+
 namespace Dibi;
 
 
diff --git a/tests/dibi/Connection.affectedRows.phpt b/tests/dibi/Connection.affectedRows.phpt
index 8114ccfb..19d49be2 100644
--- a/tests/dibi/Connection.affectedRows.phpt
+++ b/tests/dibi/Connection.affectedRows.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Connection.connect.phpt b/tests/dibi/Connection.connect.phpt
index ed31db92..54a5f27a 100644
--- a/tests/dibi/Connection.connect.phpt
+++ b/tests/dibi/Connection.connect.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 use Dibi\Connection;
 
diff --git a/tests/dibi/Connection.fetch.phpt b/tests/dibi/Connection.fetch.phpt
index 072d6b7e..d7b2b1f7 100644
--- a/tests/dibi/Connection.fetch.phpt
+++ b/tests/dibi/Connection.fetch.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 use Dibi\Row;
 
diff --git a/tests/dibi/Connection.substitutions.phpt b/tests/dibi/Connection.substitutions.phpt
index 2e652da2..2c1a98f2 100644
--- a/tests/dibi/Connection.substitutions.phpt
+++ b/tests/dibi/Connection.substitutions.phpt
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Connection.transactions.phpt b/tests/dibi/Connection.transactions.phpt
index 6eae5c33..04cfaa35 100644
--- a/tests/dibi/Connection.transactions.phpt
+++ b/tests/dibi/Connection.transactions.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/DataSource.phpt b/tests/dibi/DataSource.phpt
index b0b89567..cc731278 100644
--- a/tests/dibi/DataSource.phpt
+++ b/tests/dibi/DataSource.phpt
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Tester\Assert;
 use Dibi\Row;
 
diff --git a/tests/dibi/Fluent.cloning.phpt b/tests/dibi/Fluent.cloning.phpt
index 6e18b4c0..5c4d5af5 100644
--- a/tests/dibi/Fluent.cloning.phpt
+++ b/tests/dibi/Fluent.cloning.phpt
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Tester\Assert;
 use Dibi\Fluent;
 
diff --git a/tests/dibi/Fluent.delete.phpt b/tests/dibi/Fluent.delete.phpt
index 199d4c51..405f8819 100644
--- a/tests/dibi/Fluent.delete.phpt
+++ b/tests/dibi/Fluent.delete.phpt
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Fluent.fetch.limit.mssql.phpt b/tests/dibi/Fluent.fetch.limit.mssql.phpt
index 241e6ba1..f63c8367 100644
--- a/tests/dibi/Fluent.fetch.limit.mssql.phpt
+++ b/tests/dibi/Fluent.fetch.limit.mssql.phpt
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Fluent.fetch.limit.phpt b/tests/dibi/Fluent.fetch.limit.phpt
index 6695b786..e8e54be8 100644
--- a/tests/dibi/Fluent.fetch.limit.phpt
+++ b/tests/dibi/Fluent.fetch.limit.phpt
@@ -4,6 +4,8 @@
  * @dataProvider? ../databases.ini mysql
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Fluent.fetch.phpt b/tests/dibi/Fluent.fetch.phpt
index 9b03575e..bc831a6e 100644
--- a/tests/dibi/Fluent.fetch.phpt
+++ b/tests/dibi/Fluent.fetch.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 use Dibi\Row;
 
diff --git a/tests/dibi/Fluent.insert.phpt b/tests/dibi/Fluent.insert.phpt
index db0226db..474e4758 100644
--- a/tests/dibi/Fluent.insert.phpt
+++ b/tests/dibi/Fluent.insert.phpt
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Fluent.select.phpt b/tests/dibi/Fluent.select.phpt
index 45a85eca..78f24bd8 100644
--- a/tests/dibi/Fluent.select.phpt
+++ b/tests/dibi/Fluent.select.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Fluent.update.phpt b/tests/dibi/Fluent.update.phpt
index ea7ada32..a9f37d0d 100644
--- a/tests/dibi/Fluent.update.phpt
+++ b/tests/dibi/Fluent.update.phpt
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Helpers.getSuggestion().phpt b/tests/dibi/Helpers.getSuggestion().phpt
index 29ca4a02..b8d971c0 100644
--- a/tests/dibi/Helpers.getSuggestion().phpt
+++ b/tests/dibi/Helpers.getSuggestion().phpt
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Dibi\Helpers;
 use Tester\Assert;
 
diff --git a/tests/dibi/Postgre.like.phpt b/tests/dibi/Postgre.like.phpt
index 716bb0f7..b84c5c28 100644
--- a/tests/dibi/Postgre.like.phpt
+++ b/tests/dibi/Postgre.like.phpt
@@ -4,6 +4,8 @@
  * @dataProvider? ../databases.ini postgre
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Result.meta.phpt b/tests/dibi/Result.meta.phpt
index 96b863c9..fdd12551 100644
--- a/tests/dibi/Result.meta.phpt
+++ b/tests/dibi/Result.meta.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini !=odbc, !=sqlsrv
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Result.normalize.phpt b/tests/dibi/Result.normalize.phpt
index 73e17754..19d0d078 100644
--- a/tests/dibi/Result.normalize.phpt
+++ b/tests/dibi/Result.normalize.phpt
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Tester\Assert;
 use Dibi\Type;
 
@@ -164,7 +166,7 @@ test(function () {
 	Assert::same(['col' => NULL], $result->test(['col' => NULL]));
 	Assert::exception(function () use ($result) {
 		$result->test(['col' => TRUE]);
-	}, Exception::class);
+	}, TypeError::class);
 	Assert::same(['col' => NULL], $result->test(['col' => FALSE]));
 
 	Assert::same(['col' => NULL], $result->test(['col' => '']));
@@ -183,7 +185,7 @@ test(function () {
 	Assert::same(['col' => NULL], $result->test(['col' => NULL]));
 	Assert::exception(function () use ($result) {
 		$result->test(['col' => TRUE]);
-	}, Exception::class);
+	}, TypeError::class);
 	Assert::same(['col' => NULL], $result->test(['col' => FALSE]));
 
 	Assert::same(['col' => NULL], $result->test(['col' => '']));
@@ -201,7 +203,7 @@ test(function () {
 	Assert::same(['col' => NULL], $result->test(['col' => NULL]));
 	Assert::exception(function () use ($result) {
 		$result->test(['col' => TRUE]);
-	}, Exception::class);
+	}, TypeError::class);
 	Assert::same(['col' => NULL], $result->test(['col' => FALSE]));
 
 	Assert::same(['col' => NULL], $result->test(['col' => '']));
@@ -217,7 +219,7 @@ test(function () {
 	Assert::same(['col' => NULL], $result->test(['col' => NULL]));
 	Assert::exception(function () use ($result) {
 		$result->test(['col' => TRUE]);
-	}, Exception::class);
+	}, TypeError::class);
 	Assert::same(['col' => NULL], $result->test(['col' => FALSE]));
 
 	Assert::same(['col' => NULL], $result->test(['col' => '']));
diff --git a/tests/dibi/Result.types.phpt b/tests/dibi/Result.types.phpt
index 6be67fc0..aeddfba3 100644
--- a/tests/dibi/Result.types.phpt
+++ b/tests/dibi/Result.types.phpt
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Row.phpt b/tests/dibi/Row.phpt
index f631c708..bcf79bd5 100644
--- a/tests/dibi/Row.phpt
+++ b/tests/dibi/Row.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Sqlsrv.insert.phpt b/tests/dibi/Sqlsrv.insert.phpt
index 8520a3d2..b4e4fa49 100644
--- a/tests/dibi/Sqlsrv.insert.phpt
+++ b/tests/dibi/Sqlsrv.insert.phpt
@@ -4,6 +4,8 @@
  * @dataProvider? ../databases.ini sqlsrv
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Sqlsrv.limits.phpt b/tests/dibi/Sqlsrv.limits.phpt
index 38d9cdc2..adc13242 100644
--- a/tests/dibi/Sqlsrv.limits.phpt
+++ b/tests/dibi/Sqlsrv.limits.phpt
@@ -4,6 +4,8 @@
  * @dataProvider? ../databases.ini sqlsrv
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Strict.phpt b/tests/dibi/Strict.phpt
index 69084445..a0390d0d 100644
--- a/tests/dibi/Strict.phpt
+++ b/tests/dibi/Strict.phpt
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Translator.DateTimeInterface.phpt b/tests/dibi/Translator.DateTimeInterface.phpt
index 1d61cbd3..f5c7ba99 100644
--- a/tests/dibi/Translator.DateTimeInterface.phpt
+++ b/tests/dibi/Translator.DateTimeInterface.phpt
@@ -4,6 +4,8 @@
  * @phpversion 5.5
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Translator.conditions.phpt b/tests/dibi/Translator.conditions.phpt
index 99198212..fbd25a30 100644
--- a/tests/dibi/Translator.conditions.phpt
+++ b/tests/dibi/Translator.conditions.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Translator.identifiers.phpt b/tests/dibi/Translator.identifiers.phpt
index 176a97c6..d842bc08 100644
--- a/tests/dibi/Translator.identifiers.phpt
+++ b/tests/dibi/Translator.identifiers.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/Translator.phpt b/tests/dibi/Translator.phpt
index d9e5918b..7cf5f2c0 100644
--- a/tests/dibi/Translator.phpt
+++ b/tests/dibi/Translator.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 use Dibi\DateTime;
 
diff --git a/tests/dibi/bootstrap.php b/tests/dibi/bootstrap.php
index 254b884f..2fd619d4 100644
--- a/tests/dibi/bootstrap.php
+++ b/tests/dibi/bootstrap.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 // The Nette Tester command-line runner can be
 // invoked through the command: ../../vendor/bin/tester .
 
diff --git a/tests/dibi/exceptions.mysql.phpt b/tests/dibi/exceptions.mysql.phpt
index 97d81471..dbdb809c 100644
--- a/tests/dibi/exceptions.mysql.phpt
+++ b/tests/dibi/exceptions.mysql.phpt
@@ -5,6 +5,8 @@
  * @dataProvider? ../databases.ini mysql
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/exceptions.postgre.phpt b/tests/dibi/exceptions.postgre.phpt
index dc1f4b13..3ec3379d 100644
--- a/tests/dibi/exceptions.postgre.phpt
+++ b/tests/dibi/exceptions.postgre.phpt
@@ -5,6 +5,8 @@
  * @dataProvider? ../databases.ini postgre
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/exceptions.sqlite.phpt b/tests/dibi/exceptions.sqlite.phpt
index 3e192317..b59f1fcf 100644
--- a/tests/dibi/exceptions.sqlite.phpt
+++ b/tests/dibi/exceptions.sqlite.phpt
@@ -5,6 +5,8 @@
  * @dataProvider ../databases.ini sqlite
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/meta.phpt b/tests/dibi/meta.phpt
index e03b9eeb..0c2515e2 100644
--- a/tests/dibi/meta.phpt
+++ b/tests/dibi/meta.phpt
@@ -4,6 +4,8 @@
  * @dataProvider ../databases.ini !=odbc
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';
diff --git a/tests/dibi/mysql.time.phpt b/tests/dibi/mysql.time.phpt
index f0fd1cd7..5314b37c 100644
--- a/tests/dibi/mysql.time.phpt
+++ b/tests/dibi/mysql.time.phpt
@@ -4,6 +4,8 @@
  * @dataProvider? ../databases.ini mysql
  */
 
+declare(strict_types=1);
+
 use Tester\Assert;
 
 require __DIR__ . '/bootstrap.php';