diff --git a/phpcs.xml.dist b/phpcs.xml.dist
index e972afa..abf6f4b 100644
--- a/phpcs.xml.dist
+++ b/phpcs.xml.dist
@@ -241,7 +241,6 @@
     <rule ref="SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnly">
         <properties>
             <property name="allowFallbackGlobalConstants" value="false"/>
-            <property name="allowFallbackGlobalFunctions" value="false"/>
             <property name="allowFullyQualifiedGlobalConstants" value="false"/>
             <property name="allowFullyQualifiedGlobalFunctions" value="false"/>
             <property name="allowFullyQualifiedExceptions" value="true"/>
diff --git a/src/Converter/Time/PhpTimeConverter.php b/src/Converter/Time/PhpTimeConverter.php
index 1b1e198..eabae74 100644
--- a/src/Converter/Time/PhpTimeConverter.php
+++ b/src/Converter/Time/PhpTimeConverter.php
@@ -24,7 +24,6 @@ use Ramsey\Uuid\Type\Time;
 use function count;
 use function dechex;
 use function explode;
-use function ini_get;
 use function is_float;
 use function is_int;
 use function str_pad;
diff --git a/src/Generator/DefaultTimeGenerator.php b/src/Generator/DefaultTimeGenerator.php
index f82d663..3feea5c 100644
--- a/src/Generator/DefaultTimeGenerator.php
+++ b/src/Generator/DefaultTimeGenerator.php
@@ -27,7 +27,7 @@ use function dechex;
 use function hex2bin;
 use function is_int;
 use function pack;
-use function random_int;
+use function sprintf;
 use function str_pad;
 use function strlen;
 
diff --git a/src/Generator/RandomBytesGenerator.php b/src/Generator/RandomBytesGenerator.php
index dcf6ad8..e6e9a19 100644
--- a/src/Generator/RandomBytesGenerator.php
+++ b/src/Generator/RandomBytesGenerator.php
@@ -16,8 +16,6 @@ namespace Ramsey\Uuid\Generator;
 
 use Ramsey\Uuid\Exception\RandomSourceException;
 
-use function random_bytes;
-
 /**
  * RandomBytesGenerator generates strings of random binary data using the
  * built-in `random_bytes()` PHP function
diff --git a/src/Provider/Dce/SystemDceSecurityProvider.php b/src/Provider/Dce/SystemDceSecurityProvider.php
index 18f0d5e..1ee12bd 100644
--- a/src/Provider/Dce/SystemDceSecurityProvider.php
+++ b/src/Provider/Dce/SystemDceSecurityProvider.php
@@ -18,11 +18,8 @@ use Ramsey\Uuid\Exception\DceSecurityException;
 use Ramsey\Uuid\Provider\DceSecurityProviderInterface;
 use Ramsey\Uuid\Type\IntegerValue;
 
-use function constant;
 use function escapeshellarg;
-use function ini_get;
 use function preg_split;
-use function shell_exec;
 use function str_getcsv;
 use function strpos;
 use function strrpos;
diff --git a/src/Provider/Node/RandomNodeProvider.php b/src/Provider/Node/RandomNodeProvider.php
index e4c10e7..aa3a3d1 100644
--- a/src/Provider/Node/RandomNodeProvider.php
+++ b/src/Provider/Node/RandomNodeProvider.php
@@ -21,7 +21,6 @@ use function bin2hex;
 use function dechex;
 use function hex2bin;
 use function hexdec;
-use function random_bytes;
 use function str_pad;
 use function substr;
 
diff --git a/src/Provider/Node/SystemNodeProvider.php b/src/Provider/Node/SystemNodeProvider.php
index 9c19c45..486f194 100644
--- a/src/Provider/Node/SystemNodeProvider.php
+++ b/src/Provider/Node/SystemNodeProvider.php
@@ -19,16 +19,10 @@ use Ramsey\Uuid\Provider\NodeProviderInterface;
 use function array_filter;
 use function array_map;
 use function array_walk;
-use function constant;
 use function count;
-use function file_get_contents;
-use function glob;
-use function ini_get;
 use function is_array;
-use function is_readable;
 use function ob_get_clean;
 use function ob_start;
-use function passthru;
 use function preg_match;
 use function preg_match_all;
 use function reset;
diff --git a/src/Provider/Time/SystemTimeProvider.php b/src/Provider/Time/SystemTimeProvider.php
index 8958c48..93ff01f 100644
--- a/src/Provider/Time/SystemTimeProvider.php
+++ b/src/Provider/Time/SystemTimeProvider.php
@@ -17,8 +17,6 @@ namespace Ramsey\Uuid\Provider\Time;
 use Ramsey\Uuid\Provider\TimeProviderInterface;
 use Ramsey\Uuid\Type\Time;
 
-use function gettimeofday;
-
 /**
  * SystemTimeProvider retrieves the current time using built-in PHP functions
  */