diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 08a1fbb..f6c6c16 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: ['7.1', '7.2', '7.3', '7.4', '8.0']
+        php: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
 
     steps:
       - name: Checkout code
@@ -23,6 +23,12 @@ jobs:
           tools: composer
           coverage: none
 
+      - name: Require PHPSpec 7.1 dependencies
+        run: |
+          composer require "phpspec/phpspec:^7.1@dev" --no-interaction --no-update
+          composer update --prefer-dist --no-interaction --no-progress --ignore-platform-req=php
+        if: "matrix.php == '8.1'"
+
       - name: Install dependencies
         run: composer update --prefer-dist --no-interaction --no-progress
 
diff --git a/composer.json b/composer.json
index fc67cd0..5d24bcd 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
         "ext-zlib": "*",
         "ergebnis/composer-normalize": "^2.6",
         "guzzlehttp/psr7": "^1.0",
-        "phpspec/phpspec": "^5.1 || ^6.3",
+        "phpspec/phpspec": "^5.1 || ^6.3 || ^7.1",
         "slim/slim": "^3.0",
         "laminas/laminas-diactoros": "^2.0"
     },