diff --git a/.travis.yml b/.travis.yml
index fd0107d..c05bbc5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,7 @@ services:
 
 env:
   global:
-    - COMPOSER_ROOT_VERSION=4.6.x-dev
+    - COMPOSER_ROOT_VERSION=4.x-dev
 
 matrix:
   include:
@@ -27,7 +27,7 @@ before_script:
 
   - composer validate
   - composer require --no-update silverstripe-themes/simple:~3.2.0
-  - if [[ $DB == PGSQL ]]; then composer require silverstripe/postgresql:2.4.x-dev --no-update; fi
+  - if [[ $DB == PGSQL ]]; then composer require silverstripe/postgresql:2.x-dev --no-update; fi
   - composer install --prefer-source --no-interaction --no-progress --no-suggest --optimize-autoloader --verbose --profile
 
   # Validate cow schema
diff --git a/composer.json b/composer.json
index 8e36f0f..8a7898e 100644
--- a/composer.json
+++ b/composer.json
@@ -6,25 +6,22 @@
     "license": "BSD-3-Clause",
     "require": {
         "silverstripe/recipe-plugin": "^1.2",
-        "silverstripe/recipe-core": "4.6.x-dev",
-        "silverstripe/admin": "1.6.x-dev",
-        "silverstripe/asset-admin": "1.6.x-dev",
-        "silverstripe/campaign-admin": "1.6.x-dev",
-        "silverstripe/versioned-admin": "1.4.x-dev",
-        "silverstripe/cms": "4.6.x-dev",
-        "silverstripe/errorpage": "1.6.x-dev",
-        "silverstripe/graphql": "3.3.x-dev",
-        "silverstripe/reports": "4.6.x-dev",
-        "silverstripe/siteconfig": "4.6.x-dev",
-        "silverstripe/versioned": "1.6.x-dev"
+        "silverstripe/recipe-core": "4.x-dev",
+        "silverstripe/admin": "1.x-dev",
+        "silverstripe/asset-admin": "1.x-dev",
+        "silverstripe/campaign-admin": "1.x-dev",
+        "silverstripe/versioned-admin": "1.x-dev",
+        "silverstripe/cms": "4.x-dev",
+        "silverstripe/errorpage": "1.x-dev",
+        "silverstripe/graphql": "3.x-dev",
+        "silverstripe/reports": "4.x-dev",
+        "silverstripe/siteconfig": "4.x-dev",
+        "silverstripe/versioned": "1.x-dev"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.7"
     },
     "extra": {
-        "branch-alias": {
-            "4.x-dev": "4.6.x-dev"
-        },
         "project-files": [
             "app/src/*"
         ],