diff --git a/create-file-system/templates/efs-dashboard-with-size-monitor-and-burst-credit-balance-alarms.yml b/create-file-system/templates/efs-dashboard-with-size-monitor-and-burst-credit-balance-alarms.yml
index e61dcd5..0fa4ed0 100644
--- a/create-file-system/templates/efs-dashboard-with-size-monitor-and-burst-credit-balance-alarms.yml
+++ b/create-file-system/templates/efs-dashboard-with-size-monitor-and-burst-credit-balance-alarms.yml
@@ -315,7 +315,7 @@ Resources:
       FunctionName: !Join [ '', [ 'efs-', !Ref ElasticFileSystem, '-size-monitor' ] ]
       Handler: index.handler
       Role: !GetAtt LambdaRoleRetain.Arn
-      Runtime: python2.7
+      Runtime: python3.8
       Timeout: 60
   EfsSizeMonitorFunctionDelete:
     Type: AWS::Lambda::Function
@@ -376,7 +376,7 @@ Resources:
       FunctionName: !Join [ '', [ 'efs-', !Ref ElasticFileSystem, '-size-monitor' ] ]
       Handler: index.handler
       Role: !GetAtt LambdaRoleDelete.Arn
-      Runtime: python2.7
+      Runtime: python3.8
       Timeout: 60
   LambdaRoleRetain:
     Type: AWS::IAM::Role
diff --git a/create-file-system/templates/efs-dashboard-with-size-monitor.yml b/create-file-system/templates/efs-dashboard-with-size-monitor.yml
index 79eac95..61c5eb5 100644
--- a/create-file-system/templates/efs-dashboard-with-size-monitor.yml
+++ b/create-file-system/templates/efs-dashboard-with-size-monitor.yml
@@ -159,7 +159,7 @@ Resources:
       FunctionName: !Join [ '', [ 'efs-', !Ref ElasticFileSystem, '-size-monitor' ] ]
       Handler: index.handler
       Role: !GetAtt LambdaRoleRetain.Arn
-      Runtime: python2.7
+      Runtime: python3.8
       Timeout: 60
   EfsSizeMonitorFunctionDelete:
     Type: AWS::Lambda::Function
@@ -220,7 +220,7 @@ Resources:
       FunctionName: !Join [ '', [ 'efs-', !Ref ElasticFileSystem, '-size-monitor' ] ]
       Handler: index.handler
       Role: !GetAtt LambdaRoleDelete.Arn
-      Runtime: python2.7
+      Runtime: python3.8
       Timeout: 60
   LambdaRoleRetain:
     Type: AWS::IAM::Role
diff --git a/monitoring/templates/cw_dashboard_with_mm_for_efs.yaml b/monitoring/templates/cw_dashboard_with_mm_for_efs.yaml
index 46785f7..f9a27bb 100644
--- a/monitoring/templates/cw_dashboard_with_mm_for_efs.yaml
+++ b/monitoring/templates/cw_dashboard_with_mm_for_efs.yaml
@@ -520,7 +520,7 @@ Resources:
       FunctionName: !Join [ '-', [ !Ref ElasticFileSystem, 'size-monitor', !Ref 'AWS::StackName' ] ]
       Handler: index.handler
       Role: !GetAtt LambdaRoleRetain.Arn
-      Runtime: python2.7
+      Runtime: python3.8
       Timeout: 60
 
   EfsSizeMonitorFunctionDelete:
@@ -582,7 +582,7 @@ Resources:
       FunctionName: !Join [ '-', [ !Ref ElasticFileSystem, 'size-monitor', !Ref 'AWS::StackName' ] ]
       Handler: index.handler
       Role: !GetAtt LambdaRoleDelete.Arn
-      Runtime: python2.7
+      Runtime: python3.8
       Timeout: 60
 
   LambdaRoleRetain:
diff --git a/monitoring/templates/efs-dashboard-with-size-monitor-and-burst-credit-balance-alarms.yml b/monitoring/templates/efs-dashboard-with-size-monitor-and-burst-credit-balance-alarms.yml
index e61dcd5..0fa4ed0 100644
--- a/monitoring/templates/efs-dashboard-with-size-monitor-and-burst-credit-balance-alarms.yml
+++ b/monitoring/templates/efs-dashboard-with-size-monitor-and-burst-credit-balance-alarms.yml
@@ -315,7 +315,7 @@ Resources:
       FunctionName: !Join [ '', [ 'efs-', !Ref ElasticFileSystem, '-size-monitor' ] ]
       Handler: index.handler
       Role: !GetAtt LambdaRoleRetain.Arn
-      Runtime: python2.7
+      Runtime: python3.8
       Timeout: 60
   EfsSizeMonitorFunctionDelete:
     Type: AWS::Lambda::Function
@@ -376,7 +376,7 @@ Resources:
       FunctionName: !Join [ '', [ 'efs-', !Ref ElasticFileSystem, '-size-monitor' ] ]
       Handler: index.handler
       Role: !GetAtt LambdaRoleDelete.Arn
-      Runtime: python2.7
+      Runtime: python3.8
       Timeout: 60
   LambdaRoleRetain:
     Type: AWS::IAM::Role
diff --git a/monitoring/templates/efs-dashboard-with-size-monitor.yml b/monitoring/templates/efs-dashboard-with-size-monitor.yml
index 79eac95..61c5eb5 100644
--- a/monitoring/templates/efs-dashboard-with-size-monitor.yml
+++ b/monitoring/templates/efs-dashboard-with-size-monitor.yml
@@ -159,7 +159,7 @@ Resources:
       FunctionName: !Join [ '', [ 'efs-', !Ref ElasticFileSystem, '-size-monitor' ] ]
       Handler: index.handler
       Role: !GetAtt LambdaRoleRetain.Arn
-      Runtime: python2.7
+      Runtime: python3.8
       Timeout: 60
   EfsSizeMonitorFunctionDelete:
     Type: AWS::Lambda::Function
@@ -220,7 +220,7 @@ Resources:
       FunctionName: !Join [ '', [ 'efs-', !Ref ElasticFileSystem, '-size-monitor' ] ]
       Handler: index.handler
       Role: !GetAtt LambdaRoleDelete.Arn
-      Runtime: python2.7
+      Runtime: python3.8
       Timeout: 60
   LambdaRoleRetain:
     Type: AWS::IAM::Role