diff --git a/src/Symfony/Component/DependencyInjection/CHANGELOG.md b/src/Symfony/Component/DependencyInjection/CHANGELOG.md
index 7e03a508561d..f13b825ce79a 100644
--- a/src/Symfony/Component/DependencyInjection/CHANGELOG.md
+++ b/src/Symfony/Component/DependencyInjection/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+4.0.0
+-----
+
+ * removed `Container::isFrozen`
+
 3.3.0
 -----
 
diff --git a/src/Symfony/Component/DependencyInjection/Container.php b/src/Symfony/Component/DependencyInjection/Container.php
index 05e038ac5cb6..5a8c6eda3420 100644
--- a/src/Symfony/Component/DependencyInjection/Container.php
+++ b/src/Symfony/Component/DependencyInjection/Container.php
@@ -114,20 +114,6 @@ public function isCompiled()
         return $this->compiled;
     }
 
-    /**
-     * Returns true if the container parameter bag are frozen.
-     *
-     * Deprecated since 3.3, to be removed in 4.0.
-     *
-     * @return bool true if the container parameter bag are frozen, false otherwise
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return $this->parameterBag instanceof FrozenParameterBag;
-    }
-
     /**
      * Gets the service container parameter bag.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
index 66a6c56bf5cc..4f627171be02 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
@@ -920,16 +920,6 @@ public function isCompiled()
         return true;
     }
 
-    /*{$this->docStar}
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
 EOF;
     }
 
diff --git a/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php b/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php
index 99419201c638..1fc18126393a 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php
@@ -83,19 +83,6 @@ public function testCompile()
         $this->assertEquals(array('foo' => 'bar'), $sc->getParameterBag()->all(), '->compile() copies the current parameters to the new parameter bag');
     }
 
-    /**
-     * @group legacy
-     * @expectedDeprecation The Symfony\Component\DependencyInjection\Container::isFrozen() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.
-     * @expectedDeprecation The Symfony\Component\DependencyInjection\Container::isFrozen() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.
-     */
-    public function testIsFrozen()
-    {
-        $sc = new Container(new ParameterBag(array('foo' => 'bar')));
-        $this->assertFalse($sc->isFrozen(), '->isFrozen() returns false if the parameters are not frozen');
-        $sc->compile();
-        $this->assertTrue($sc->isFrozen(), '->isFrozen() returns true if the parameters are frozen');
-    }
-
     public function testIsCompiled()
     {
         $sc = new Container(new ParameterBag(array('foo' => 'bar')));
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1-1.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1-1.php
index 44631328ce60..32f488e8f342 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1-1.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1-1.php
@@ -48,14 +48,4 @@ public function isCompiled()
     {
         return true;
     }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
 }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1.php
index 9ad021ece802..baa1874a9ab4 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1.php
@@ -46,14 +46,4 @@ public function isCompiled()
     {
         return true;
     }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
 }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services10.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services10.php
index 1cc1cc3d1644..c4192697b16c 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services10.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services10.php
@@ -52,16 +52,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'test' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services12.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services12.php
index 511127c1008d..3c20aa41a99d 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services12.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services12.php
@@ -56,16 +56,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'test' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services13.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services13.php
index 1cffb23b7b87..da30f18e5fe8 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services13.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services13.php
@@ -50,16 +50,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'bar' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services19.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services19.php
index 8718efe078d3..81ab4a6ca6bf 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services19.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services19.php
@@ -51,16 +51,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'service_from_anonymous_factory' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services24.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services24.php
index 6ccbbd31949f..f64c99f5d081 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services24.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services24.php
@@ -50,16 +50,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'foo' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services26.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services26.php
index 809d70da5e52..08e54eed089e 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services26.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services26.php
@@ -52,16 +52,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'test' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services31.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services31.php
index d22a130cd051..045b3c8e6134 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services31.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services31.php
@@ -51,16 +51,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'bar' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services32.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services32.php
index 08ca63092a6a..c18b3f5d4421 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services32.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services32.php
@@ -51,16 +51,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'bar' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services33.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services33.php
index fe0510cc2602..76787db068b2 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services33.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services33.php
@@ -53,16 +53,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'Symfony\Component\DependencyInjection\Tests\Fixtures\Container33\Foo' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services8.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services8.php
index bfc1d68bd1ef..a21d47d21bce 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services8.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services8.php
@@ -49,16 +49,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * {@inheritdoc}
      */
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
index f35ca89f03e1..da2accd3687c 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
@@ -73,16 +73,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'bar' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_dump_proxy_with_void_return_type.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_dump_proxy_with_void_return_type.php
index ec6af7fc2c8c..f09561d8f4e1 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_dump_proxy_with_void_return_type.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_dump_proxy_with_void_return_type.php
@@ -51,16 +51,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'bar' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php
index d623194c3ee6..651547430bcf 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php
@@ -61,16 +61,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'bar_service' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php
index 1fbfc52e4a07..d6e0e57205f4 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php
@@ -55,16 +55,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'bar_service' service.
      *
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php
index df5603572497..9179b270b141 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php
@@ -59,16 +59,6 @@ public function isCompiled()
         return true;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isFrozen()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
-
-        return true;
-    }
-
     /**
      * Gets the 'Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber' service.
      *