diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 72e6dcc..7e6e62a 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -7,6 +7,9 @@ on:
     branches:
       - main
 
+env:
+  PHP_VERSION: 8.3
+
 # Cancels all previous workflow runs for the same branch that have not yet completed.
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -23,7 +26,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: latest
+          php-version: ${{ env.PHP_VERSION }}
           coverage: none
 
       - name: Install dependencies
@@ -42,7 +45,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: latest
+          php-version: ${{ env.PHP_VERSION }}
           coverage: none
 
       - name: Install dependencies
@@ -55,13 +58,12 @@ jobs:
         run: composer analyse:psalm
 
   unit-tests:
-    name: Unit Tests (PHP ${{ matrix.php-version }}) on ${{ matrix.os }}
+    name: Unit Tests on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
 
     strategy:
       fail-fast: false
       matrix:
-        php-version: [8.3]
         os: [ubuntu-latest, macos-latest, windows-latest]
         dependencies: [lowest, highest]
 
@@ -72,7 +74,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: ${{ matrix.php-version }}
+          php-version: ${{ env.PHP_VERSION }}
           coverage: none
 
       - name: Install dependencies