diff --git a/stubs/Fiber.php b/stubs/Fiber.php
deleted file mode 100644
index 2b0d485..0000000
--- a/stubs/Fiber.php
+++ /dev/null
@@ -1,92 +0,0 @@
-<?php
-
-final class Fiber
-{
-    /**
-     * @param callable $callback Function to invoke when starting the fiber.
-     */
-    public function __construct(callable $callback) { }
-
-    /**
-     * Starts execution of the fiber. Returns when the fiber suspends or terminates.
-     *
-     * @param mixed ...$args Arguments passed to fiber function.
-     *
-     * @return mixed Value from the first suspension point.
-     *
-     * @throw FiberError If the fiber is running or terminated.
-     * @throw Throwable If the fiber callable throws an uncaught exception.
-     */
-    public function start(mixed ...$args): mixed { }
-
-    /**
-     * Resumes the fiber, returning the given value from {@see Fiber::suspend()}.
-     * Returns when the fiber suspends or terminates.
-     *
-     * @param mixed $value
-     *
-     * @return mixed Value from the next suspension point or NULL if the fiber terminates.
-     *
-     * @throw FiberError If the fiber is running or terminated.
-     * @throw Throwable If the fiber callable throws an uncaught exception.
-     */
-    public function resume(mixed $value = null): mixed { }
-
-    /**
-     * Throws the given exception into the fiber from {@see Fiber::suspend()}.
-     * Returns when the fiber suspends or terminates.
-     *
-     * @param Throwable $exception
-     *
-     * @return mixed Value from the next suspension point or NULL if the fiber terminates.
-     *
-     * @throw FiberError If the fiber is running or terminated.
-     * @throw Throwable If the fiber callable throws an uncaught exception.
-     */
-    public function throw(Throwable $exception): mixed { }
-
-    /**
-     * @return bool True if the fiber has been started.
-     */
-    public function isStarted(): bool { }
-
-    /**
-     * @return bool True if the fiber is suspended.
-     */
-    public function isSuspended(): bool { }
-
-    /**
-     * @return bool True if the fiber is currently running.
-     */
-    public function isRunning(): bool { }
-
-    /**
-     * @return bool True if the fiber has completed execution.
-     */
-    public function isTerminated(): bool { }
-
-    /**
-     * @return mixed Return value of the fiber callback.
-     *
-     * @throws FiberError If the fiber has not terminated or did not return a value.
-     */
-    public function getReturn(): mixed { }
-
-    /**
-     * @return self|null Returns the currently executing fiber instance or NULL if in {main}.
-     */
-    public static function this(): ?self { }
-
-    /**
-     * Suspend execution of the fiber. The fiber may be resumed with {@see Fiber::resume()} or {@see Fiber::throw()}.
-     *
-     * Cannot be called from {main}.
-     *
-     * @param mixed $value Value to return from {@see Fiber::resume()} or {@see Fiber::throw()}.
-     *
-     * @return mixed Value provided to {@see Fiber::resume()}.
-     *
-     * @throws Throwable Exception provided to {@see Fiber::throw()}.
-     */
-    public static function suspend(mixed $value = null): mixed { }
-}
diff --git a/stubs/FiberError.php b/stubs/FiberError.php
deleted file mode 100644
index 822d70d..0000000
--- a/stubs/FiberError.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-
-/**
- * Exception thrown due to invalid fiber actions, such as resuming a terminated fiber.
- */
-final class FiberError extends Error
-{
-    /**
-     * Constructor throws to prevent user code from throwing FiberError.
-     */
-    public function __construct()
-    {
-        throw new \Error('The "FiberError" class is reserved for internal use and cannot be manually instantiated');
-    }
-}
diff --git a/stubs/FiberExit.php b/stubs/FiberExit.php
deleted file mode 100644
index 9f3b03f..0000000
--- a/stubs/FiberExit.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-
-/**
- * Exception thrown when destroying a fiber. This exception cannot be caught by user code.
- */
-final class FiberExit extends Exception
-{
-    /**
-     * Constructor throws to prevent user code from throwing FiberExit.
-     */
-    public function __construct()
-    {
-        throw new \Error('The "FiberExit" class is reserved for internal use and cannot be manually instantiated');
-    }
-}
diff --git a/stubs/ReflectionFiber.php b/stubs/ReflectionFiber.php
deleted file mode 100644
index 4fc76dd..0000000
--- a/stubs/ReflectionFiber.php
+++ /dev/null
@@ -1,49 +0,0 @@
-<?php
-
-class ReflectionFiber
-{
-    /**
-     * @param Fiber $fiber Any Fiber object, including those that are not started or have
-     *                     terminated.
-     */
-    public function __construct(Fiber $fiber) { }
-
-    /**
-     * @return string Current file of fiber execution.
-     */
-    public function getExecutingFile(): string { }
-
-    /**
-     * @return int Current line of fiber execution.
-     */
-    public function getExecutingLine(): int { }
-
-    /**
-     * @param int $options Same flags as {@see debug_backtrace()}.
-     *
-     * @return array Fiber backtrace, similar to {@see debug_backtrace()}
-     *               and {@see ReflectionGenerator::getTrace()}.
-     */
-    public function getTrace(int $options = DEBUG_BACKTRACE_PROVIDE_OBJECT): array { }
-
-    /**
-     * @return bool True if the fiber has been started.
-     */
-    public function isStarted(): bool { }
-
-    /**
-     * @return bool True if the fiber is currently suspended.
-     */
-    public function isSuspended(): bool { }
-
-    /**
-     * @return bool True if the fiber is currently running.
-     */
-    public function isRunning(): bool { }
-
-    /**
-     * @return bool True if the fiber has completed execution (either returning or
-     *              throwing an exception), false otherwise.
-     */
-    public function isTerminated(): bool { }
-}