diff --git a/composer.json b/composer.json
index 1dc0cc9..958dc24 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     "require": {
         "php": "^7.2",
         "dealerdirect/phpcodesniffer-composer-installer": "^0.4",
-        "slevomat/coding-standard": "^4.6.1",
+        "slevomat/coding-standard": "^4.8",
         "squizlabs/php_codesniffer": "^3.3.2"
     },
     "require-dev": {
diff --git a/src/Libero/ruleset.xml b/src/Libero/ruleset.xml
index e81b69e..b1a1919 100644
--- a/src/Libero/ruleset.xml
+++ b/src/Libero/ruleset.xml
@@ -26,8 +26,15 @@
             <property name="psr12Compatible" value="true"/>
         </properties>
     </rule>
+    <rule ref="SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnly">
+        <properties>
+            <property name="allowFallbackGlobalConstants" value="false"/>
+            <property name="allowFallbackGlobalFunctions" value="false"/>
+        </properties>
+    </rule>
     <rule ref="SlevomatCodingStandard.Namespaces.UnusedUses"/>
     <rule ref="SlevomatCodingStandard.Namespaces.UseDoesNotStartWithBackslash"/>
+    <rule ref="SlevomatCodingStandard.Namespaces.UseFromSameNamespace"/>
     <rule ref="SlevomatCodingStandard.Namespaces.UseSpacing"/>
     <rule ref="SlevomatCodingStandard.TypeHints.DeclareStrictTypes">
         <properties>
diff --git a/tests/RulesetTests.php b/tests/RulesetTests.php
index 0bd833a..bda7d4f 100644
--- a/tests/RulesetTests.php
+++ b/tests/RulesetTests.php
@@ -21,6 +21,7 @@
 use function implode;
 use function ini_get;
 use function mb_convert_encoding;
+use function mb_detect_encoding;
 use function preg_match_all;
 use function preg_replace;
 use function sort;
diff --git a/tests/cases/php/global-fallbacks b/tests/cases/php/global-fallbacks
new file mode 100644
index 0000000..498fe7a
--- /dev/null
+++ b/tests/cases/php/global-fallbacks
@@ -0,0 +1,24 @@
+---DESCRIPTION---
+No global fallbacks
+---CONTENTS---
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor;
+
+date(DATE_ATOM);
+
+---FIXED---
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor;
+
+use function date;
+use const DATE_ATOM;
+
+date(DATE_ATOM);
+
+---
diff --git a/tests/cases/php/use-fully-qualified b/tests/cases/php/use-fully-qualified
new file mode 100644
index 0000000..089859e
--- /dev/null
+++ b/tests/cases/php/use-fully-qualified
@@ -0,0 +1,32 @@
+---DESCRIPTION---
+Use statements must be used
+---CONTENTS---
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor;
+
+new \Foo(\bar(\BAZ));
+new \Qux\Quux(\Qux\quuz(\Qux\CORGE));
+new \Vendor\Grault(\Vendor\garply(\Vendor\WALDO));
+
+---FIXED---
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor;
+
+use Foo;
+use Qux\Quux;
+use function bar;
+use function Qux\quuz;
+use const BAZ;
+use const Qux\CORGE;
+
+new Foo(bar(BAZ));
+new Quux(quuz(CORGE));
+new Grault(garply(WALDO));
+
+---
diff --git a/tests/cases/php/use-useless b/tests/cases/php/use-useless
new file mode 100644
index 0000000..6f2c223
--- /dev/null
+++ b/tests/cases/php/use-useless
@@ -0,0 +1,25 @@
+---DESCRIPTION---
+Use statements must not be from the same namespace
+---CONTENTS---
+<?php
+
+declare(strict_types=1);
+
+namespace Foo;
+
+use Foo\Bar;
+use function Foo\baz;
+use const Foo\QUX;
+
+new Bar(baz(QUX));
+
+---FIXED---
+<?php
+
+declare(strict_types=1);
+
+namespace Foo;
+
+new Bar(baz(QUX));
+
+---
diff --git a/tests/cases/whitespace/use-namespace b/tests/cases/whitespace/use-namespace
index 0e8e99c..8c2f159 100644
--- a/tests/cases/whitespace/use-namespace
+++ b/tests/cases/whitespace/use-namespace
@@ -5,11 +5,11 @@ Use declarations must go after the namespace declaration
 
 declare(strict_types=1);
 
-use Foo;
+use Foo\Bar;
 
 namespace Vendor;
 
-new Foo();
+new Bar();
 
 ---MESSAGES---
 5:1 PSR2.Namespaces.UseDeclaration.UseBeforeNamespace