diff --git a/src/index.js b/src/index.js
index 39b3d3b..b923c59 100644
--- a/src/index.js
+++ b/src/index.js
@@ -492,7 +492,7 @@ module.exports.warmUp = async (event, context) => {
       FunctionName: func.name,
       InvocationType: 'RequestResponse',
       LogType: 'None',
-      Qualifier: process.env.SERVERLESS_ALIAS || '$LATEST',
+      Qualifier: process.env.SERVERLESS_ALIAS,
       Payload: func.config.payload
     };
 
@@ -554,7 +554,7 @@ module.exports.warmUp = async (event, context) => {
         FunctionName: warmupOpts.name,
         InvocationType: 'RequestResponse',
         LogType: 'None',
-        Qualifier: SERVERLESS_ALIAS || '$LATEST',
+        Qualifier: SERVERLESS_ALIAS,
         Payload: warmupOpts.payload,
       };
 
diff --git a/test/hook.afterDeployDeploy.test.js b/test/hook.afterDeployDeploy.test.js
index 0fb6acb..18c21ed 100644
--- a/test/hook.afterDeployDeploy.test.js
+++ b/test/hook.afterDeployDeploy.test.js
@@ -27,7 +27,7 @@ describe('Serverless warmup plugin after:deploy:deploy hook', () => {
       FunctionName: 'warmup-test-dev-warmup-plugin',
       InvocationType: 'RequestResponse',
       LogType: 'None',
-      Qualifier: '$LATEST',
+      Qualifier: undefined,
       Payload: '{"source":"serverless-plugin-warmup"}',
     };
     expect(mockProvider.request).toHaveBeenCalledWith('Lambda', 'invoke', params);
@@ -95,7 +95,7 @@ describe('Serverless warmup plugin after:deploy:deploy hook', () => {
       FunctionName: 'warmup-test-dev-warmup-plugin',
       InvocationType: 'RequestResponse',
       LogType: 'None',
-      Qualifier: '$LATEST',
+      Qualifier: undefined,
       Payload: '{"source":"serverless-plugin-warmup"}',
     };
     expect(mockProvider.request).toHaveBeenCalledWith('Lambda', 'invoke', params);
diff --git a/test/utils/configUtils.js b/test/utils/configUtils.js
index 86ebcd8..a2fa6a8 100644
--- a/test/utils/configUtils.js
+++ b/test/utils/configUtils.js
@@ -53,7 +53,6 @@ function getExpectedLambdaCallOptions(funcName, options = {}) {
     FunctionName: funcName,
     InvocationType: 'RequestResponse',
     LogType: 'None',
-    Qualifier: '$LATEST',
     Payload: '{"source":"serverless-plugin-warmup"}',
     ...options,
   };