diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f6cc82e..64af7dc 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -16,6 +16,9 @@ jobs:
     name: "Lint"
     runs-on: "ubuntu-latest"
 
+    env:
+      COMPOSER_IGNORE_PLATFORM_REQ: "${{ matrix.php-version == '8.6' && 'php+' || '' }}" # PHP 8.6 is a pre-release; dependencies don't allow it yet
+
     strategy:
       matrix:
         php-version:
@@ -26,6 +29,7 @@ jobs:
           - "8.3"
           - "8.4"
           - "8.5"
+          - "8.6"
 
     steps:
       - name: Harden the runner (Audit all outbound calls)
@@ -98,6 +102,9 @@ jobs:
     name: "Tests"
     runs-on: "ubuntu-latest"
 
+    env:
+      COMPOSER_IGNORE_PLATFORM_REQ: "${{ matrix.php-version == '8.6' && 'php+' || '' }}" # PHP 8.6 is a pre-release; dependencies don't allow it yet
+
     strategy:
       fail-fast: false
       matrix:
@@ -109,6 +116,7 @@ jobs:
           - "8.3"
           - "8.4"
           - "8.5"
+          - "8.6"
         dependencies:
           - "lowest"
           - "highest"
@@ -143,6 +151,9 @@ jobs:
     name: "PHPStan"
     runs-on: "ubuntu-latest"
 
+    env:
+      COMPOSER_IGNORE_PLATFORM_REQ: "${{ matrix.php-version == '8.6' && 'php+' || '' }}" # PHP 8.6 is a pre-release; dependencies don't allow it yet
+
     strategy:
       fail-fast: false
       matrix:
@@ -154,6 +165,7 @@ jobs:
           - "8.3"
           - "8.4"
           - "8.5"
+          - "8.6"
         dependencies:
           - "lowest"
           - "highest"