diff --git a/.github/workflows/benchmarks.yml b/.github/workflows/benchmarks.yml
index 88cef877..88e4b370 100644
--- a/.github/workflows/benchmarks.yml
+++ b/.github/workflows/benchmarks.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         php-version:
-          - "8.3"
+          - "8.4"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/code-coverage.yml b/.github/workflows/code-coverage.yml
index c0484ea7..7fc2feef 100644
--- a/.github/workflows/code-coverage.yml
+++ b/.github/workflows/code-coverage.yml
@@ -17,7 +17,7 @@ jobs:
       - name: "installing PHP"
         uses: "shivammathur/setup-php@v2"
         with:
-          php-version: "8.3"
+          php-version: "8.4"
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
           extensions: bcmath, mbstring, intl, sodium, json
diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 835c9bbf..d9376481 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -15,7 +15,7 @@ jobs:
       - name: "installing PHP"
         uses: "shivammathur/setup-php@v2"
         with:
-          php-version: "8.3"
+          php-version: "8.4"
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
           extensions: bcmath, mbstring, intl, sodium, json
diff --git a/.github/workflows/documentation-check.yml b/.github/workflows/documentation-check.yml
index d583dbc2..6fb7da39 100644
--- a/.github/workflows/documentation-check.yml
+++ b/.github/workflows/documentation-check.yml
@@ -15,7 +15,7 @@ jobs:
       - name: "installing PHP"
         uses: "shivammathur/setup-php@v2"
         with:
-          php-version: "8.3"
+          php-version: "8.4"
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
           extensions: bcmath, mbstring, intl, sodium, json
diff --git a/.github/workflows/mutation-tests.yml b/.github/workflows/mutation-tests.yml
index 7d7d0f8b..9c96e3a2 100644
--- a/.github/workflows/mutation-tests.yml
+++ b/.github/workflows/mutation-tests.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         php-version:
-          - "8.3"
+          - "8.4"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/preload-check.yml b/.github/workflows/preload-check.yml
index bf3c6e06..8cea21ac 100644
--- a/.github/workflows/preload-check.yml
+++ b/.github/workflows/preload-check.yml
@@ -15,7 +15,7 @@ jobs:
       - name: "installing PHP"
         uses: "shivammathur/setup-php@v2"
         with:
-          php-version: "8.3"
+          php-version: "8.4"
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
           extensions: bcmath, mbstring, intl, sodium, json
diff --git a/.github/workflows/security-analysis.yml b/.github/workflows/security-analysis.yml
index 2fc53704..51c2ef2c 100644
--- a/.github/workflows/security-analysis.yml
+++ b/.github/workflows/security-analysis.yml
@@ -15,7 +15,7 @@ jobs:
       - name: "installing PHP"
         uses: "shivammathur/setup-php@v2"
         with:
-          php-version: "8.3"
+          php-version: "8.4"
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
           extensions: bcmath, mbstring, intl, sodium, json
diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index 56a18f02..35ef6109 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -17,7 +17,7 @@ jobs:
       - name: "installing PHP"
         uses: "shivammathur/setup-php@v2"
         with:
-          php-version: "8.3"
+          php-version: "8.4"
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
           extensions: bcmath, mbstring, intl, sodium, json
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index cfdb3430..07a005a2 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -15,6 +15,7 @@ jobs:
         php-version:
           - "8.2"
           - "8.3"
+          - "8.4"
         operating-system:
           - "macos-latest"
           - "ubuntu-latest"
diff --git a/composer.json b/composer.json
index 6127ff32..392ca0d7 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         }
     ],
     "require": {
-        "php": "~8.2.0 || ~8.3.0",
+        "php": "~8.2.0 || ~8.3.0 || ~8.4.0",
         "ext-bcmath": "*",
         "ext-json": "*",
         "ext-mbstring": "*",