diff --git a/composer.json b/composer.json
index 8513e5fe79..40fb550b0e 100644
--- a/composer.json
+++ b/composer.json
@@ -134,6 +134,9 @@
         "framework/yii"
     ],
     "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        },
         "asset-installer-paths": {
             "npm-asset-library": "vendor/npm",
             "bower-asset-library": "vendor/bower"
diff --git a/extensions/apidoc/composer.json b/extensions/apidoc/composer.json
index 16e8cd101d..80fda8252f 100644
--- a/extensions/apidoc/composer.json
+++ b/extensions/apidoc/composer.json
@@ -33,6 +33,9 @@
 	},
 	"bin": ["apidoc"],
 	"extra": {
+		"branch-alias": {
+			"dev-master": "2.0.x-dev"
+		},
 		"asset-installer-paths": {
 			"npm-asset-library": "vendor/npm",
 			"bower-asset-library": "vendor/bower"
diff --git a/extensions/authclient/composer.json b/extensions/authclient/composer.json
index 81c5aa1f2a..39f5166b2a 100644
--- a/extensions/authclient/composer.json
+++ b/extensions/authclient/composer.json
@@ -23,5 +23,10 @@
 	},
 	"autoload": {
 		"psr-4": { "yii\\authclient\\": "" }
+	},
+	"extra": {
+		"branch-alias": {
+			"dev-master": "2.0.x-dev"
+		}
 	}
 }
diff --git a/extensions/bootstrap/composer.json b/extensions/bootstrap/composer.json
index 744611fc47..839a6d249c 100644
--- a/extensions/bootstrap/composer.json
+++ b/extensions/bootstrap/composer.json
@@ -25,5 +25,10 @@
         "psr-4": {
             "yii\\bootstrap\\": ""
         }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
     }
 }
diff --git a/extensions/codeception/composer.json b/extensions/codeception/composer.json
index fa99992554..3a11b06ae8 100644
--- a/extensions/codeception/composer.json
+++ b/extensions/codeception/composer.json
@@ -21,5 +21,10 @@
 	},
 	"autoload": {
 		"psr-4": { "yii\\codeception\\": "" }
-	}
+	},
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }
diff --git a/extensions/composer/composer.json b/extensions/composer/composer.json
index f311581d66..7e540341c5 100644
--- a/extensions/composer/composer.json
+++ b/extensions/composer/composer.json
@@ -17,13 +17,16 @@
 			"email": "qiang.xue@gmail.com"
 		}
 	],
+    "require": {
+        "composer-plugin-api": "1.0.0"
+    },
 	"autoload": {
 		"psr-4": { "yii\\composer\\": "" }
 	},
-	"extra": {
-		"class": "yii\\composer\\Plugin"
-	},
-	"require": {
-		"composer-plugin-api": "1.0.0"
-	}
+    "extra": {
+        "class": "yii\\composer\\Plugin",
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }
diff --git a/extensions/debug/composer.json b/extensions/debug/composer.json
index 0ae32c1fa3..6edd31af17 100644
--- a/extensions/debug/composer.json
+++ b/extensions/debug/composer.json
@@ -25,5 +25,10 @@
         "psr-4": {
             "yii\\debug\\": ""
         }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
     }
 }
diff --git a/extensions/elasticsearch/composer.json b/extensions/elasticsearch/composer.json
index d38454f9e7..8bbebe8da3 100644
--- a/extensions/elasticsearch/composer.json
+++ b/extensions/elasticsearch/composer.json
@@ -23,5 +23,10 @@
 	},
 	"autoload": {
 		"psr-4": { "yii\\elasticsearch\\": "" }
-	}
+	},
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }
diff --git a/extensions/faker/composer.json b/extensions/faker/composer.json
index a8a5bc1a2b..ffda69aa35 100644
--- a/extensions/faker/composer.json
+++ b/extensions/faker/composer.json
@@ -22,5 +22,10 @@
 	},
 	"autoload": {
 		"psr-4": { "yii\\faker\\": "" }
-	}
+	},
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }
diff --git a/extensions/gii/composer.json b/extensions/gii/composer.json
index 3ec4d169f7..41e391ca6e 100644
--- a/extensions/gii/composer.json
+++ b/extensions/gii/composer.json
@@ -27,5 +27,10 @@
         "psr-4": {
             "yii\\gii\\": ""
         }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
     }
 }
diff --git a/extensions/imagine/composer.json b/extensions/imagine/composer.json
index e4ec8ec12b..11a887e707 100644
--- a/extensions/imagine/composer.json
+++ b/extensions/imagine/composer.json
@@ -25,5 +25,10 @@
 		"psr-4": {
 			"yii\\imagine\\": ""
 		}
-	}
+	},
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }
diff --git a/extensions/jui/composer.json b/extensions/jui/composer.json
index a97aab5599..77e564eb66 100644
--- a/extensions/jui/composer.json
+++ b/extensions/jui/composer.json
@@ -25,5 +25,10 @@
         "psr-4": {
             "yii\\jui\\": ""
         }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
     }
 }
diff --git a/extensions/mongodb/composer.json b/extensions/mongodb/composer.json
index 6556bd00ae..b68e1f1e55 100644
--- a/extensions/mongodb/composer.json
+++ b/extensions/mongodb/composer.json
@@ -23,5 +23,10 @@
 	},
 	"autoload": {
 		"psr-4": { "yii\\mongodb\\": "" }
-	}
+	},
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }
diff --git a/extensions/redis/composer.json b/extensions/redis/composer.json
index 756102836a..16b95d1461 100644
--- a/extensions/redis/composer.json
+++ b/extensions/redis/composer.json
@@ -22,5 +22,10 @@
 	},
 	"autoload": {
 		"psr-4": { "yii\\redis\\": "" }
-	}
+	},
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }
diff --git a/extensions/smarty/composer.json b/extensions/smarty/composer.json
index 7d32b6d28c..8c4da17a28 100644
--- a/extensions/smarty/composer.json
+++ b/extensions/smarty/composer.json
@@ -23,5 +23,10 @@
 	},
 	"autoload": {
 		"psr-4": { "yii\\smarty\\": "" }
-	}
+	},
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }
diff --git a/extensions/sphinx/composer.json b/extensions/sphinx/composer.json
index db3e928c15..275fa28b3b 100644
--- a/extensions/sphinx/composer.json
+++ b/extensions/sphinx/composer.json
@@ -24,5 +24,10 @@
 	},
 	"autoload": {
 		"psr-4": { "yii\\sphinx\\": "" }
-	}
+	},
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }
diff --git a/extensions/swiftmailer/composer.json b/extensions/swiftmailer/composer.json
index f248942888..d745811c6a 100644
--- a/extensions/swiftmailer/composer.json
+++ b/extensions/swiftmailer/composer.json
@@ -23,5 +23,10 @@
 	},
 	"autoload": {
 		"psr-4": { "yii\\swiftmailer\\": "" }
-	}
+	},
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }
diff --git a/extensions/twig/composer.json b/extensions/twig/composer.json
index ee7b0f8582..4aeb80289e 100644
--- a/extensions/twig/composer.json
+++ b/extensions/twig/composer.json
@@ -23,5 +23,10 @@
 	},
 	"autoload": {
 		"psr-4": { "yii\\twig\\": "" }
-	}
+	},
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }
diff --git a/framework/composer.json b/framework/composer.json
index 251a8609b6..06524b2604 100644
--- a/framework/composer.json
+++ b/framework/composer.json
@@ -68,5 +68,10 @@
     },
     "bin": [
         "yii"
-    ]
+    ],
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
 }