diff --git a/src/Notyf/Prime/.github/workflows/tests.yaml b/src/Notyf/Prime/.github/workflows/tests.yaml
index aea66f51..ed9d25f2 100644
--- a/src/Notyf/Prime/.github/workflows/tests.yaml
+++ b/src/Notyf/Prime/.github/workflows/tests.yaml
@@ -33,9 +33,9 @@ jobs:
                     php-version: ${{ matrix.php }}
                     coverage: none
 
-            -   name: Require phpunit 5.7 for php >= 5.6
-                if: matrix.php >= 5.6
-                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:5.7.*" --no-interaction --no-update
+            -   name: Require phpunit 4.8 for php <= 5.6
+                if: matrix.php <= 5.6
+                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:4.8.36" --no-interaction --no-update
 
             -   name: Require phpunit 6 for php >= 7.0
                 if: matrix.php >= 7.0
diff --git a/src/Pnotify/Prime/.github/workflows/tests.yaml b/src/Pnotify/Prime/.github/workflows/tests.yaml
index 78dba8d7..a8ee59d7 100644
--- a/src/Pnotify/Prime/.github/workflows/tests.yaml
+++ b/src/Pnotify/Prime/.github/workflows/tests.yaml
@@ -33,9 +33,9 @@ jobs:
                     php-version: ${{ matrix.php }}
                     coverage: none
 
-            -   name: Require phpunit 5.7 for php >= 5.6
-                if: matrix.php >= 5.6
-                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:5.7.*" --no-interaction --no-update
+            -   name: Require phpunit 4.8 for php <= 5.6
+                if: matrix.php <= 5.6
+                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:4.8.36" --no-interaction --no-update
 
             -   name: Require phpunit 6 for php >= 7.0
                 if: matrix.php >= 7.0
diff --git a/src/Prime/.github/workflows/tests.yaml b/src/Prime/.github/workflows/tests.yaml
index 78dba8d7..a8ee59d7 100644
--- a/src/Prime/.github/workflows/tests.yaml
+++ b/src/Prime/.github/workflows/tests.yaml
@@ -33,9 +33,9 @@ jobs:
                     php-version: ${{ matrix.php }}
                     coverage: none
 
-            -   name: Require phpunit 5.7 for php >= 5.6
-                if: matrix.php >= 5.6
-                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:5.7.*" --no-interaction --no-update
+            -   name: Require phpunit 4.8 for php <= 5.6
+                if: matrix.php <= 5.6
+                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:4.8.36" --no-interaction --no-update
 
             -   name: Require phpunit 6 for php >= 7.0
                 if: matrix.php >= 7.0
diff --git a/src/SweetAlert/Prime/.github/workflows/tests.yaml b/src/SweetAlert/Prime/.github/workflows/tests.yaml
index 78dba8d7..a8ee59d7 100644
--- a/src/SweetAlert/Prime/.github/workflows/tests.yaml
+++ b/src/SweetAlert/Prime/.github/workflows/tests.yaml
@@ -33,9 +33,9 @@ jobs:
                     php-version: ${{ matrix.php }}
                     coverage: none
 
-            -   name: Require phpunit 5.7 for php >= 5.6
-                if: matrix.php >= 5.6
-                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:5.7.*" --no-interaction --no-update
+            -   name: Require phpunit 4.8 for php <= 5.6
+                if: matrix.php <= 5.6
+                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:4.8.36" --no-interaction --no-update
 
             -   name: Require phpunit 6 for php >= 7.0
                 if: matrix.php >= 7.0
diff --git a/src/Toastr/Prime/.github/workflows/tests.yaml b/src/Toastr/Prime/.github/workflows/tests.yaml
index 78dba8d7..a8ee59d7 100644
--- a/src/Toastr/Prime/.github/workflows/tests.yaml
+++ b/src/Toastr/Prime/.github/workflows/tests.yaml
@@ -33,9 +33,9 @@ jobs:
                     php-version: ${{ matrix.php }}
                     coverage: none
 
-            -   name: Require phpunit 5.7 for php >= 5.6
-                if: matrix.php >= 5.6
-                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:5.7.*" --no-interaction --no-update
+            -   name: Require phpunit 4.8 for php <= 5.6
+                if: matrix.php <= 5.6
+                run: COMPOSER_MEMORY_LIMIT=-1 composer require "phpunit/phpunit:4.8.36" --no-interaction --no-update
 
             -   name: Require phpunit 6 for php >= 7.0
                 if: matrix.php >= 7.0