diff --git a/tests/Retry.Tests.ps1 b/tests/Retry.Tests.ps1
index 5aad86e..c622d83 100644
--- a/tests/Retry.Tests.ps1
+++ b/tests/Retry.Tests.ps1
@@ -1,4 +1,6 @@
-Describe 'Functions' {
+#Requires -Modules @{ ModuleName = 'Pester'; ModuleVersion = '6.0.0'; MaximumVersion = '6.*' }
+
+Describe 'Functions' {
     Context 'Invoke-Retry' {
         It 'Invoke-Retry -Count 5 -Delay 5 {...} should not throw' {
             {