diff --git a/composer.json b/composer.json
index 1bc576b1120e8..61a7251983f12 100644
--- a/composer.json
+++ b/composer.json
@@ -188,7 +188,7 @@
             "url": "src/Symfony/Contracts",
             "options": {
                 "versions": {
-                    "symfony/contracts": "3.0.x-dev"
+                    "symfony/contracts": "3.1.x-dev"
                 }
             }
         },
diff --git a/src/Symfony/Contracts/Cache/composer.json b/src/Symfony/Contracts/Cache/composer.json
index 1523e063e5e74..55769fe504bcc 100644
--- a/src/Symfony/Contracts/Cache/composer.json
+++ b/src/Symfony/Contracts/Cache/composer.json
@@ -28,7 +28,7 @@
     "minimum-stability": "dev",
     "extra": {
         "branch-alias": {
-            "dev-main": "3.0-dev"
+            "dev-main": "3.1-dev"
         },
         "thanks": {
             "name": "symfony/contracts",
diff --git a/src/Symfony/Contracts/Deprecation/composer.json b/src/Symfony/Contracts/Deprecation/composer.json
index 1c1b4ba0e9400..e85ed6fc5850e 100644
--- a/src/Symfony/Contracts/Deprecation/composer.json
+++ b/src/Symfony/Contracts/Deprecation/composer.json
@@ -25,7 +25,7 @@
     "minimum-stability": "dev",
     "extra": {
         "branch-alias": {
-            "dev-main": "3.0-dev"
+            "dev-main": "3.1-dev"
         },
         "thanks": {
             "name": "symfony/contracts",
diff --git a/src/Symfony/Contracts/EventDispatcher/composer.json b/src/Symfony/Contracts/EventDispatcher/composer.json
index b4c3933baee49..436bb5ac2be75 100644
--- a/src/Symfony/Contracts/EventDispatcher/composer.json
+++ b/src/Symfony/Contracts/EventDispatcher/composer.json
@@ -28,7 +28,7 @@
     "minimum-stability": "dev",
     "extra": {
         "branch-alias": {
-            "dev-main": "3.0-dev"
+            "dev-main": "3.1-dev"
         },
         "thanks": {
             "name": "symfony/contracts",
diff --git a/src/Symfony/Contracts/HttpClient/composer.json b/src/Symfony/Contracts/HttpClient/composer.json
index a26300f4a78dd..5cea33690316d 100644
--- a/src/Symfony/Contracts/HttpClient/composer.json
+++ b/src/Symfony/Contracts/HttpClient/composer.json
@@ -27,7 +27,7 @@
     "minimum-stability": "dev",
     "extra": {
         "branch-alias": {
-            "dev-main": "3.0-dev"
+            "dev-main": "3.1-dev"
         },
         "thanks": {
             "name": "symfony/contracts",
diff --git a/src/Symfony/Contracts/Service/composer.json b/src/Symfony/Contracts/Service/composer.json
index d3b047f9a42ba..fd940fd99feeb 100644
--- a/src/Symfony/Contracts/Service/composer.json
+++ b/src/Symfony/Contracts/Service/composer.json
@@ -31,7 +31,7 @@
     "minimum-stability": "dev",
     "extra": {
         "branch-alias": {
-            "dev-main": "3.0-dev"
+            "dev-main": "3.1-dev"
         },
         "thanks": {
             "name": "symfony/contracts",
diff --git a/src/Symfony/Contracts/Translation/composer.json b/src/Symfony/Contracts/Translation/composer.json
index 875242f6d9add..579dcd79454ba 100644
--- a/src/Symfony/Contracts/Translation/composer.json
+++ b/src/Symfony/Contracts/Translation/composer.json
@@ -27,7 +27,7 @@
     "minimum-stability": "dev",
     "extra": {
         "branch-alias": {
-            "dev-main": "3.0-dev"
+            "dev-main": "3.1-dev"
         },
         "thanks": {
             "name": "symfony/contracts",
diff --git a/src/Symfony/Contracts/composer.json b/src/Symfony/Contracts/composer.json
index c520738efec2c..ac7fe739c12e1 100644
--- a/src/Symfony/Contracts/composer.json
+++ b/src/Symfony/Contracts/composer.json
@@ -52,7 +52,7 @@
     "minimum-stability": "dev",
     "extra": {
         "branch-alias": {
-            "dev-main": "3.0-dev"
+            "dev-main": "3.1-dev"
         }
     }
 }