diff --git a/src/Illuminate/Container/Container.php b/src/Illuminate/Container/Container.php
index 98d8f0ae7900..8e3b5449958b 100755
--- a/src/Illuminate/Container/Container.php
+++ b/src/Illuminate/Container/Container.php
@@ -63,6 +63,13 @@ class Container implements ArrayAccess, ContainerContract
      */
     protected $abstractAliases = [];
 
+    /**
+     * The global extension closures for services.
+     *
+     * @var array[]
+     */
+    protected $globalExtenders = [];
+
     /**
      * The extension closures for services.
      *
@@ -378,14 +385,20 @@ public function singletonIf($abstract, $concrete = null)
     /**
      * "Extend" an abstract type in the container.
      *
-     * @param  string  $abstract
-     * @param  \Closure  $closure
+     * @param  string|\Closure  $abstract
+     * @param  \Closure|null  $closure
      * @return void
      *
      * @throws \InvalidArgumentException
      */
-    public function extend($abstract, Closure $closure)
+    public function extend($abstract, Closure $closure = null)
     {
+        if ($abstract instanceof Closure) {
+            $this->globalExtenders[] = $abstract;
+
+            return;
+        }
+
         $abstract = $this->getAlias($abstract);
 
         if (isset($this->instances[$abstract])) {
@@ -1173,7 +1186,20 @@ public function getAlias($abstract)
      */
     protected function getExtenders($abstract)
     {
-        return $this->extenders[$this->getAlias($abstract)] ?? [];
+        return array_merge(
+            $this->globalExtenders,
+            $this->extenders[$this->getAlias($abstract)] ?? []
+        );
+    }
+
+    /**
+     * Remove all of the global extender callbacks.
+     *
+     * @return void
+     */
+    public function forgetGlobalExtenders()
+    {
+        $this->globalExtenders = [];
     }
 
     /**
diff --git a/tests/Container/ContainerExtendTest.php b/tests/Container/ContainerExtendTest.php
index a34c5c6ef9d6..f2c5353cb022 100644
--- a/tests/Container/ContainerExtendTest.php
+++ b/tests/Container/ContainerExtendTest.php
@@ -187,6 +187,209 @@ public function testUnsetExtend()
 
         $this->assertSame('foo', $container->make('foo'));
     }
+
+    public function testGloballyExtendedBindings()
+    {
+        // Given a simple "foo" binding.
+        $container = new Container;
+        $container['foo'] = 'foo';
+
+        // When we append "bar" to all bindings.
+        $container->extend(function ($old, $container) {
+            return $old.'bar';
+        });
+
+        // Then we resolve "foobar".
+        $this->assertSame('foobar', $container->make('foo'));
+    }
+
+    public function testGloballyExtendedSingletons()
+    {
+        // Given an registered "foo" singleton.
+        $container = new Container;
+        $container->singleton('foo', function () {
+            return (object) ['name' => 'taylor'];
+        });
+
+        // When we add the age property to all bindings.
+        $container->extend(function ($old, $container) {
+            $old->age = 26;
+
+            return $old;
+        });
+
+        // Then the "foo" singleton has the "age" property.
+        $result = $container->make('foo');
+        $this->assertSame('taylor', $result->name);
+        $this->assertEquals(26, $result->age);
+
+        // And it stays the same instance no matter how many times we resolve it.
+        $this->assertSame($result, $container->make('foo'));
+    }
+
+    public function testResolvedInstancesAreNotAffectedByNewGlobalExtenders()
+    {
+        // Given an already resolved "foo" instance.
+        $container = new Container;
+        $container->instance('foo', (object) ['foo' => 'original']);
+
+        // When we add a new global extender.
+        $container->extend(function ($obj, $container) {
+            $obj->foo = 'extended';
+
+            return $obj;
+        });
+
+        // Then the "foo" instance was not extended.
+        $this->assertSame('original', $container->make('foo')->foo);
+    }
+
+    public function testGlobalExtendersAreLazyInitialized()
+    {
+        // Given an uninitialized class.
+        ContainerLazyExtendStub::$initialized = false;
+
+        // And a simple binding of that class.
+        $container = new Container;
+        $container->bind(ContainerLazyExtendStub::class);
+
+        // When we add a global extender that initializes that class.
+        $container->extend(function ($obj, $container) {
+            $obj->init();
+
+            return $obj;
+        });
+
+        // Then the class is still not initialized.
+        $this->assertFalse(ContainerLazyExtendStub::$initialized);
+
+        // but will be initialized when resolved from the container.
+        $container->make(ContainerLazyExtendStub::class);
+        $this->assertTrue(ContainerLazyExtendStub::$initialized);
+    }
+
+    public function testGlobalExtendersCanBeCalledBeforeBind()
+    {
+        // Given a registered global extenders that appends "bar" to all bindings.
+        $container = new Container;
+        $container->extend(function ($old, $container) {
+            return $old.'bar';
+        });
+
+        // When we, later on, bind "foo" to the container.
+        $container['foo'] = 'foo';
+
+        // Then it gets resolved to "foobar".
+        $this->assertSame('foobar', $container->make('foo'));
+    }
+
+    public function testGlobalExtendersDoNotTriggerInstanceRebindingCallbacks()
+    {
+        // Given an indicator that the instance has no rebound.
+        $testRebound = false;
+
+        // And a rebinding callback that toggles that indicator to true.
+        $container = new Container;
+        $container->rebinding('foo', function () use (&$testRebound) {
+            $testRebound = true;
+        });
+
+        // And a "foo" instance already bound.
+        $obj = new stdClass;
+        $container->instance('foo', $obj);
+
+        // When we register a new global extender.
+        $container->extend(function ($obj, $container) {
+            return $obj;
+        });
+
+        // Then the rebinding callback was not called.
+        $this->assertFalse($testRebound);
+    }
+
+    public function testGlobalExtendersDoNotTriggerBindRebindingCallback()
+    {
+        // Given an indicator that the instance has no rebound.
+        $testRebound = false;
+
+        // And a rebinding callback that toggles that indicator to true.
+        $container = new Container;
+        $container->rebinding('foo', function () use (&$testRebound) {
+            $testRebound = true;
+        });
+
+        // And an existing "foo" binding that has been resolved once.
+        $container->bind('foo', function () {
+            return new stdClass;
+        });
+        $container->make('foo');
+        $this->assertFalse($testRebound);
+
+        // When we register a new global extender.
+        $container->extend(function ($obj, $container) {
+            return $obj;
+        });
+
+        // Then the rebinding callback was not called.
+        $this->assertFalse($testRebound);
+    }
+
+    public function testGlobalExtensionWorksOnAliasedBindings()
+    {
+        // Given a singleton with an alias.
+        $container = new Container;
+        $container->singleton('something', function () {
+            return 'some value';
+        });
+        $container->alias('something', 'something-alias');
+
+        // When we register a global extender.
+        $container->extend(function ($value) {
+            return $value.' extended';
+        });
+
+        // Then both the singleton and its alias appear to be extended.
+        $this->assertSame('some value extended', $container->make('something'));
+        $this->assertSame('some value extended', $container->make('something-alias'));
+    }
+
+    public function testMultipleGlobalExtenders()
+    {
+        // Given a simple binding.
+        $container = new Container;
+        $container['foo'] = 'foo';
+
+        // When we register two global extenders.
+        $container->extend(function ($old, $container) {
+            return $old.'bar';
+        });
+        $container->extend(function ($old, $container) {
+            return $old.'baz';
+        });
+
+        // Then the binding has been extended by both global extenders.
+        $this->assertSame('foobarbaz', $container->make('foo'));
+    }
+
+    public function testForgetGlobalExtenders()
+    {
+        // Given a simple binding.
+        $container = new Container;
+        $container->bind('foo', function () {
+            return 'foo';
+        });
+
+        // And a global extender that appends "bar" to all bindings.
+        $container->extend(function ($obj, $container) {
+            return $obj.'bar';
+        });
+
+        // When we forget all global extenders.
+        $container->forgetGlobalExtenders();
+
+        // Then the global extender is not applied when we next resolve that binding.
+        $this->assertSame('foo', $container->make('foo'));
+    }
 }
 
 class ContainerLazyExtendStub