diff --git a/CHANGELOG.md b/CHANGELOG.md
index f14bb939d..0dcf3f20c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ Please also have a look at our
 
 ### Changed
 
+- Remove `thecodingmachine/safe` dependency (#1482)
 - Clean up extra whitespace in CSS selector (#1398)
 - The array keys passed to `DeclarationBlock::setSelectors()` are no longer
   preserved (#1407)
diff --git a/bin/quickdump.php b/bin/quickdump.php
index dc0fe8697..7d3919a5d 100755
--- a/bin/quickdump.php
+++ b/bin/quickdump.php
@@ -5,7 +5,7 @@
 
 use Sabberworm\CSS\Parser;
 
-use function Safe\file_get_contents;
+use function Sabberworm\CSS\Safe\file_get_contents;
 
 /**
  * This script is used for generating the examples in the README.
diff --git a/composer.json b/composer.json
index 49cc7519c..4c957bb6f 100644
--- a/composer.json
+++ b/composer.json
@@ -24,8 +24,7 @@
     "homepage": "https://www.sabberworm.com/blog/2010/6/10/php-css-parser",
     "require": {
         "php": "^7.2.0 || ~8.0.0 || ~8.1.0 || ~8.2.0 || ~8.3.0 || ~8.4.0 || ~8.5.0",
-        "ext-iconv": "*",
-        "thecodingmachine/safe": "^1.3 || ^2.5 || ^3.3"
+        "ext-iconv": "*"
     },
     "require-dev": {
         "php-parallel-lint/php-parallel-lint": "1.4.0",
@@ -44,6 +43,9 @@
         "ext-mbstring": "for parsing UTF-8 CSS"
     },
     "autoload": {
+        "files": [
+            "src/Safe/safe_functions.php"
+        ],
         "psr-4": {
             "Sabberworm\\CSS\\": "src/"
         }
diff --git a/config/phpstan.neon b/config/phpstan.neon
index 55ba682af..059c75a0f 100644
--- a/config/phpstan.neon
+++ b/config/phpstan.neon
@@ -15,6 +15,9 @@ parameters:
     - %currentWorkingDirectory%/src/
     - %currentWorkingDirectory%/tests/
 
+  excludePaths:
+    - %currentWorkingDirectory%/src/Safe/safe_functions.php
+
   type_perfect:
     no_mixed_property: true
     no_mixed_caller: true
diff --git a/src/CSSList/CSSList.php b/src/CSSList/CSSList.php
index 62f7fe654..b97d23791 100644
--- a/src/CSSList/CSSList.php
+++ b/src/CSSList/CSSList.php
@@ -25,7 +25,7 @@
 use Sabberworm\CSS\Value\URL;
 use Sabberworm\CSS\Value\Value;
 
-use function Safe\preg_match;
+use function Sabberworm\CSS\Safe\preg_match;
 
 /**
  * This is the most generic container available. It can contain `DeclarationBlock`s (rule sets with a selector),
diff --git a/src/Parsing/ParserState.php b/src/Parsing/ParserState.php
index 3451fe0c4..f1eaad426 100644
--- a/src/Parsing/ParserState.php
+++ b/src/Parsing/ParserState.php
@@ -7,9 +7,9 @@
 use Sabberworm\CSS\Comment\Comment;
 use Sabberworm\CSS\Settings;
 
-use function Safe\iconv;
-use function Safe\preg_match;
-use function Safe\preg_split;
+use function Sabberworm\CSS\Safe\iconv;
+use function Sabberworm\CSS\Safe\preg_match;
+use function Sabberworm\CSS\Safe\preg_split;
 
 /**
  * @internal since 8.7.0
diff --git a/src/Property/Selector.php b/src/Property/Selector.php
index d74554535..9c3aa96d6 100644
--- a/src/Property/Selector.php
+++ b/src/Property/Selector.php
@@ -11,8 +11,8 @@
 use Sabberworm\CSS\Property\Selector\SpecificityCalculator;
 use Sabberworm\CSS\Renderable;
 
-use function Safe\preg_match;
-use function Safe\preg_replace;
+use function Sabberworm\CSS\Safe\preg_match;
+use function Sabberworm\CSS\Safe\preg_replace;
 
 /**
  * Class representing a single CSS selector. Selectors have to be split by the comma prior to being passed into this
diff --git a/src/Property/Selector/SpecificityCalculator.php b/src/Property/Selector/SpecificityCalculator.php
index 6c7bbccd5..73a0d3ca4 100644
--- a/src/Property/Selector/SpecificityCalculator.php
+++ b/src/Property/Selector/SpecificityCalculator.php
@@ -4,7 +4,7 @@
 
 namespace Sabberworm\CSS\Property\Selector;
 
-use function Safe\preg_match_all;
+use function Sabberworm\CSS\Safe\preg_match_all;
 
 /**
  * Utility class to calculate the specificity of a CSS selector.
diff --git a/src/Rule/Rule.php b/src/Rule/Rule.php
index 26e68b231..d3af4e2d4 100644
--- a/src/Rule/Rule.php
+++ b/src/Rule/Rule.php
@@ -17,7 +17,7 @@
 use Sabberworm\CSS\Value\RuleValueList;
 use Sabberworm\CSS\Value\Value;
 
-use function Safe\preg_match;
+use function Sabberworm\CSS\Safe\preg_match;
 
 /**
  * `Rule`s just have a string key (the rule) and a 'Value'.
diff --git a/src/Safe/Exceptions/DirException.php b/src/Safe/Exceptions/DirException.php
new file mode 100644
index 000000000..33075ca79
--- /dev/null
+++ b/src/Safe/Exceptions/DirException.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS\Safe\Exceptions;
+
+class DirException extends \ErrorException implements SafeExceptionInterface
+{
+    public static function createFromPhpError(): self
+    {
+        $error = \error_get_last();
+
+        return new self($error['message'] ?? 'An error occurred', 0, $error['type'] ?? 1);
+    }
+}
diff --git a/src/Safe/Exceptions/FilesystemException.php b/src/Safe/Exceptions/FilesystemException.php
new file mode 100644
index 000000000..24eacf14b
--- /dev/null
+++ b/src/Safe/Exceptions/FilesystemException.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS\Safe\Exceptions;
+
+class FilesystemException extends \ErrorException implements SafeExceptionInterface
+{
+    public static function createFromPhpError(): self
+    {
+        $error = \error_get_last();
+
+        return new self($error['message'] ?? 'An error occurred', 0, $error['type'] ?? 1);
+    }
+}
diff --git a/src/Safe/Exceptions/IconvException.php b/src/Safe/Exceptions/IconvException.php
new file mode 100644
index 000000000..1644afe95
--- /dev/null
+++ b/src/Safe/Exceptions/IconvException.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS\Safe\Exceptions;
+
+class IconvException extends \ErrorException implements SafeExceptionInterface
+{
+    public static function createFromPhpError(): self
+    {
+        $error = \error_get_last();
+
+        return new self($error['message'] ?? 'An error occurred', 0, $error['type'] ?? 1);
+    }
+}
diff --git a/src/Safe/Exceptions/PcreException.php b/src/Safe/Exceptions/PcreException.php
new file mode 100644
index 000000000..d97bd3bbc
--- /dev/null
+++ b/src/Safe/Exceptions/PcreException.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS\Safe\Exceptions;
+
+class PcreException extends \Exception implements SafeExceptionInterface
+{
+    public static function createFromPhpError(): self
+    {
+        $errorMap = [
+            PREG_INTERNAL_ERROR => 'PREG_INTERNAL_ERROR: Internal error',
+            PREG_BACKTRACK_LIMIT_ERROR => 'PREG_BACKTRACK_LIMIT_ERROR: Backtrack limit reached',
+            PREG_RECURSION_LIMIT_ERROR => 'PREG_RECURSION_LIMIT_ERROR: Recursion limit reached',
+            PREG_BAD_UTF8_ERROR => 'PREG_BAD_UTF8_ERROR: Invalid UTF8 character',
+            PREG_BAD_UTF8_OFFSET_ERROR => 'PREG_BAD_UTF8_OFFSET_ERROR',
+            PREG_JIT_STACKLIMIT_ERROR => 'PREG_JIT_STACKLIMIT_ERROR',
+        ];
+        $errMsg = $errorMap[\preg_last_error()] ?? 'Unknown PCRE error: ' . \preg_last_error();
+
+        return new self($errMsg, \preg_last_error());
+    }
+}
diff --git a/src/Safe/Exceptions/SafeExceptionInterface.php b/src/Safe/Exceptions/SafeExceptionInterface.php
new file mode 100644
index 000000000..63f9c65fa
--- /dev/null
+++ b/src/Safe/Exceptions/SafeExceptionInterface.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS\Safe\Exceptions;
+
+interface SafeExceptionInterface extends \Throwable
+{
+}
diff --git a/src/Safe/safe_functions.php b/src/Safe/safe_functions.php
new file mode 100644
index 000000000..10c007f87
--- /dev/null
+++ b/src/Safe/safe_functions.php
@@ -0,0 +1,194 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * These functions have been absorbed from "thecodingmachine/safe" to avoid a dependency.
+ *
+ * See: https://github.com/thecodingmachine/safe
+ */
+
+namespace Sabberworm\CSS\Safe;
+
+use Sabberworm\CSS\Safe\Exceptions\DirException;
+use Sabberworm\CSS\Safe\Exceptions\FilesystemException;
+use Sabberworm\CSS\Safe\Exceptions\IconvException;
+use Sabberworm\CSS\Safe\Exceptions\PcreException;
+
+use const PREG_NO_ERROR;
+
+/**
+ * Searches subject for a match to the regular expression given in pattern.
+ *
+ * @param string $pattern The pattern to search for, as a string.
+ * @param string $subject The input string.
+ * @param null|string[] $matches If matches is provided, then it is filled with the results of search.
+ * @param int $flags Can be a combination of flags.
+ * @param int $offset Offset from which to start the search (in bytes).
+ *
+ * @return 0|1 Returns 1 if the pattern matches given subject, 0 if it does not.
+ *
+ * @throws PcreException
+ */
+function preg_match(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): int
+{
+    \error_clear_last();
+    $safeResult = \preg_match($pattern, $subject, $matches, $flags, $offset);
+    if ($safeResult === false) {
+        throw PcreException::createFromPhpError();
+    }
+
+    return $safeResult;
+}
+
+/**
+ * Searches subject for all matches to the regular expression given in pattern
+ * and puts them in matches in the order specified by flags.
+ *
+ * @param string $pattern The pattern to search for, as a string.
+ * @param string $subject The input string.
+ * @param array|null $matches Array of all matches in multi-dimensional array ordered according to flags.
+ * @param int $flags Can be a combination of flags.
+ * @param int $offset Offset from which to start the search (in bytes).
+ *
+ * @return 0|positive-int Returns the number of full pattern matches (which might be zero).
+ *
+ * @throws PcreException
+ */
+function preg_match_all(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): int
+{
+    \error_clear_last();
+    $safeResult = \preg_match_all($pattern, $subject, $matches, $flags, $offset);
+    if ($safeResult === false) {
+        throw PcreException::createFromPhpError();
+    }
+
+    return $safeResult;
+}
+
+/**
+ * Split the given string by a regular expression.
+ *
+ * @param string $pattern The pattern to search for, as a string.
+ * @param string $subject The input string.
+ * @param int|null $limit If specified, then only substrings up to limit are returned.
+ * @param int $flags Can be any combination of flags.
+ *
+ * @return list<string> Returns an array containing substrings of subject split along boundaries matched by pattern.
+ *
+ * @throws PcreException
+ */
+function preg_split(string $pattern, string $subject, ?int $limit = -1, int $flags = 0): array
+{
+    \error_clear_last();
+    $safeResult = \preg_split($pattern, $subject, $limit, $flags);
+    if ($safeResult === false) {
+        throw PcreException::createFromPhpError();
+    }
+
+    return $safeResult;
+}
+
+/**
+ * Searches subject for matches to pattern and replaces them with replacement.
+ *
+ * @param string[]|string $pattern The pattern to search for.
+ * @param string[]|string $replacement The string or an array with strings to replace.
+ * @param string|array|string[] $subject The string or an array with strings to search and replace.
+ * @param int $limit The maximum possible replacements for each pattern. Defaults to -1 (no limit).
+ * @param int $count If specified, this variable will be filled with the number of replacements done.
+ * @param-out int $count
+ *
+ * @return string|array|string[] Returns an array if the subject parameter is an array, or a string otherwise.
+ *
+ * @throws PcreException
+ */
+function preg_replace($pattern, $replacement, $subject, int $limit = -1, ?int &$count = null)
+{
+    \error_clear_last();
+    $result = \preg_replace($pattern, $replacement, $subject, $limit, $count);
+    if (\preg_last_error() !== PREG_NO_ERROR || $result === null) {
+        throw PcreException::createFromPhpError();
+    }
+
+    return $result;
+}
+
+/**
+ * Performs a character set conversion on the string from from_encoding to to_encoding.
+ *
+ * @param string $from_encoding The input charset.
+ * @param string $to_encoding The output charset.
+ * @param string $string The string to be converted.
+ *
+ * @return string Returns the converted string.
+ *
+ * @throws IconvException
+ */
+function iconv(string $from_encoding, string $to_encoding, string $string): string
+{
+    \error_clear_last();
+    $safeResult = \iconv($from_encoding, $to_encoding, $string);
+    if ($safeResult === false) {
+        throw IconvException::createFromPhpError();
+    }
+
+    return $safeResult;
+}
+
+/**
+ * This function is similar to file, except that file_get_contents returns the file in a string.
+ *
+ * @param string $filename Name of the file to read.
+ * @param bool $use_include_path Whether to search in the include path.
+ * @param resource|null $context A valid context resource created with stream_context_create.
+ * @param int $offset The offset where the reading starts on the original stream.
+ * @param 0|positive-int $length Maximum length of data read.
+ *
+ * @return string The function returns the read data.
+ *
+ * @throws FilesystemException
+ */
+function file_get_contents(string $filename, bool $use_include_path = false, $context = null, int $offset = 0, ?int $length = null): string
+{
+    \error_clear_last();
+    if ($length !== null) {
+        $safeResult = \file_get_contents($filename, $use_include_path, $context, $offset, $length);
+    } elseif ($offset !== 0) {
+        $safeResult = \file_get_contents($filename, $use_include_path, $context, $offset);
+    } elseif ($context !== null) {
+        $safeResult = \file_get_contents($filename, $use_include_path, $context);
+    } else {
+        $safeResult = \file_get_contents($filename, $use_include_path);
+    }
+    if ($safeResult === false) {
+        throw FilesystemException::createFromPhpError();
+    }
+
+    return $safeResult;
+}
+
+/**
+ * Opens up a directory handle to be used in subsequent closedir, readdir, and rewinddir calls.
+ *
+ * @param string $directory The directory path that is to be opened.
+ * @param resource|null $context For a description of the context parameter, refer to the streams section.
+ *
+ * @return resource Returns a directory handle resource on success.
+ *
+ * @throws DirException
+ */
+function opendir(string $directory, $context = null)
+{
+    \error_clear_last();
+    if ($context !== null) {
+        $safeResult = \opendir($directory, $context);
+    } else {
+        $safeResult = \opendir($directory);
+    }
+    if ($safeResult === false) {
+        throw DirException::createFromPhpError();
+    }
+
+    return $safeResult;
+}
diff --git a/src/Value/CSSString.php b/src/Value/CSSString.php
index 8271671f2..180db0cea 100644
--- a/src/Value/CSSString.php
+++ b/src/Value/CSSString.php
@@ -11,7 +11,7 @@
 use Sabberworm\CSS\Parsing\UnexpectedTokenException;
 use Sabberworm\CSS\ShortClassNameProvider;
 
-use function Safe\preg_match;
+use function Sabberworm\CSS\Safe\preg_match;
 
 /**
  * This class is a wrapper for quoted strings to distinguish them from keywords.
diff --git a/src/Value/CalcFunction.php b/src/Value/CalcFunction.php
index 3d85b22a7..852d15b57 100644
--- a/src/Value/CalcFunction.php
+++ b/src/Value/CalcFunction.php
@@ -8,7 +8,7 @@
 use Sabberworm\CSS\Parsing\UnexpectedEOFException;
 use Sabberworm\CSS\Parsing\UnexpectedTokenException;
 
-use function Safe\preg_match;
+use function Sabberworm\CSS\Safe\preg_match;
 
 class CalcFunction extends CSSFunction
 {
diff --git a/src/Value/Size.php b/src/Value/Size.php
index ad6d794cc..ac11a168a 100644
--- a/src/Value/Size.php
+++ b/src/Value/Size.php
@@ -10,8 +10,8 @@
 use Sabberworm\CSS\Parsing\UnexpectedTokenException;
 use Sabberworm\CSS\ShortClassNameProvider;
 
-use function Safe\preg_match;
-use function Safe\preg_replace;
+use function Sabberworm\CSS\Safe\preg_match;
+use function Sabberworm\CSS\Safe\preg_replace;
 
 /**
  * A `Size` consists of a numeric `size` value and a unit.
diff --git a/src/Value/Value.php b/src/Value/Value.php
index 67065d370..8c86e32b0 100644
--- a/src/Value/Value.php
+++ b/src/Value/Value.php
@@ -13,7 +13,7 @@
 use Sabberworm\CSS\Position\Positionable;
 use Sabberworm\CSS\ShortClassNameProvider;
 
-use function Safe\preg_match;
+use function Sabberworm\CSS\Safe\preg_match;
 
 /**
  * Abstract base class for specific classes of CSS values: `Size`, `Color`, `CSSString` and `URL`, and another
diff --git a/tests/ParserTest.php b/tests/ParserTest.php
index d05dc8a88..f0c5613be 100644
--- a/tests/ParserTest.php
+++ b/tests/ParserTest.php
@@ -30,8 +30,8 @@
 use Sabberworm\CSS\Value\URL;
 use Sabberworm\CSS\Value\ValueList;
 
-use function Safe\file_get_contents;
-use function Safe\opendir;
+use function Sabberworm\CSS\Safe\file_get_contents;
+use function Sabberworm\CSS\Safe\opendir;
 
 /**
  * @covers \Sabberworm\CSS\Parser
diff --git a/tests/RuleSet/LenientParsingTest.php b/tests/RuleSet/LenientParsingTest.php
index ae249701d..200326464 100644
--- a/tests/RuleSet/LenientParsingTest.php
+++ b/tests/RuleSet/LenientParsingTest.php
@@ -10,7 +10,7 @@
 use Sabberworm\CSS\Parsing\UnexpectedTokenException;
 use Sabberworm\CSS\Settings;
 
-use function Safe\file_get_contents;
+use function Sabberworm\CSS\Safe\file_get_contents;
 
 /**
  * @coversNothing