diff --git a/static/Cost/200_Cost_Category/Code/Project1cfm.yml b/static/Cost/200_Cost_Category/Code/Project1cfm.yml
index ea86d6ec8..2c7624566 100644
--- a/static/Cost/200_Cost_Category/Code/Project1cfm.yml
+++ b/static/Cost/200_Cost_Category/Code/Project1cfm.yml
@@ -396,7 +396,7 @@ Resources:
        - !GetAtt DatabaseSG.GroupId
       AllocatedStorage: '20'
       PubliclyAccessible: 'false'
-      DBInstanceClass: db.t2.micro
+      DBInstanceClass: db.t3.micro
       Engine: MySQL
       DBInstanceIdentifier: Project1Database
       MasterUsername: MyName
diff --git a/static/Cost/200_Cost_Category/Code/Project2cfm.yml b/static/Cost/200_Cost_Category/Code/Project2cfm.yml
index 52d65c0d2..e9d13bdf3 100644
--- a/static/Cost/200_Cost_Category/Code/Project2cfm.yml
+++ b/static/Cost/200_Cost_Category/Code/Project2cfm.yml
@@ -395,7 +395,7 @@ Resources:
        - !GetAtt DatabaseSG.GroupId
       AllocatedStorage: '20'
       PubliclyAccessible: 'false'
-      DBInstanceClass: db.t2.micro
+      DBInstanceClass: db.t3.micro
       Engine: MySQL
       DBInstanceIdentifier: Project2Database
       MasterUsername: MyName
diff --git a/static/Cost/300_Optimization_Data_Collection/Code/source/rds_graviton_mapping.csv b/static/Cost/300_Optimization_Data_Collection/Code/source/rds_graviton_mapping.csv
index 3fdfb36c6..e67f16165 100644
--- a/static/Cost/300_Optimization_Data_Collection/Code/source/rds_graviton_mapping.csv
+++ b/static/Cost/300_Optimization_Data_Collection/Code/source/rds_graviton_mapping.csv
@@ -39,7 +39,7 @@ Aurora,MySQL,db.r5.8xlarge,db.r6g.8xlarge
 Aurora,MySQL,db.r5.12xlarge,db.r6g.12xlarge
 Aurora,MySQL,db.r5.16xlarge,db.r6g.16xlarge
 Aurora,MySQL,db.r5.24xlarge,None
-AmazonRDS,PostgreSQL,db.t2.micro,db.t4g.micro
+AmazonRDS,PostgreSQL,db.t3.micro,db.t4g.micro
 AmazonRDS,PostgreSQL,db.t2.small,db.t4g.small
 AmazonRDS,PostgreSQL,db.t2.medium,db.t4g.medium
 AmazonRDS,PostgreSQL,db.t2.large,db.t4g.large
@@ -99,7 +99,7 @@ AmazonRDS,PostgreSQL,db.r5b.8xlarge,db.r6gd.8xlarge
 AmazonRDS,PostgreSQL,db.r5b.12xlarge,db.r6gd.12xlarge
 AmazonRDS,PostgreSQL,db.r5b.16xlarge,db.r6gd.16xlarge
 AmazonRDS,PostgreSQL,db.r5b.24xlarge,None
-AmazonRDS,MySQL,db.t2.micro,db.t4g.micro
+AmazonRDS,MySQL,db.t3.micro,db.t4g.micro
 AmazonRDS,MySQL,db.t2.small,db.t4g.small
 AmazonRDS,MySQL,db.t2.medium,db.t4g.medium
 AmazonRDS,MySQL,db.t2.large,db.t4g.large
@@ -159,7 +159,7 @@ AmazonRDS,MySQL,db.r5b.8xlarge,db.r6gd.8xlarge
 AmazonRDS,MySQL,db.r5b.12xlarge,db.r6gd.12xlarge
 AmazonRDS,MySQL,db.r5b.16xlarge,db.r6gd.16xlarge
 AmazonRDS,MySQL,db.r5b.24xlarge,None
-AmazonRDS,MariaDB,db.t2.micro,db.t4g.micro
+AmazonRDS,MariaDB,db.t3.micro,db.t4g.micro
 AmazonRDS,MariaDB,db.t2.small,db.t4g.small
 AmazonRDS,MariaDB,db.t2.medium,db.t4g.medium
 AmazonRDS,MariaDB,db.t2.large,db.t4g.large
diff --git a/static/Operations/200_Automating_operations_with_playbooks_and_runbooks/Code/templates/base_app.yml b/static/Operations/200_Automating_operations_with_playbooks_and_runbooks/Code/templates/base_app.yml
index dd1763882..7322aee90 100644
--- a/static/Operations/200_Automating_operations_with_playbooks_and_runbooks/Code/templates/base_app.yml
+++ b/static/Operations/200_Automating_operations_with_playbooks_and_runbooks/Code/templates/base_app.yml
@@ -291,7 +291,7 @@ Resources:
     Type: AWS::RDS::DBInstance
     Properties:
       AllocatedStorage: 5
-      DBInstanceClass: db.t2.micro
+      DBInstanceClass: db.t3.micro
       Engine: MySQL
       MasterUsername: !Join ['', ['{{resolve:secretsmanager:', !Ref RDSSecret, ':SecretString:username}}' ]]
       MasterUserPassword: !Join ['', ['{{resolve:secretsmanager:', !Ref RDSSecret, ':SecretString:password}}' ]]
diff --git a/static/Reliability/300_Testing_for_Resiliency_of_EC2_RDS_and_S3/Code/CloudFormation/mySQL_rds.json b/static/Reliability/300_Testing_for_Resiliency_of_EC2_RDS_and_S3/Code/CloudFormation/mySQL_rds.json
index 389b17327..dcccd7490 100644
--- a/static/Reliability/300_Testing_for_Resiliency_of_EC2_RDS_and_S3/Code/CloudFormation/mySQL_rds.json
+++ b/static/Reliability/300_Testing_for_Resiliency_of_EC2_RDS_and_S3/Code/CloudFormation/mySQL_rds.json
@@ -18,7 +18,6 @@
           "Description": "DB Instance Class",
           "Type": "String",
           "AllowedValues": [
-              "db.t2.micro",
               "db.t3.micro",
               "db.t3.small",
               "db.t3.medium",
@@ -32,7 +31,7 @@
               "db.m5.12xlarge",
               "db.m5.24xlarge"
           ],
-          "Default": "db.t2.micro",
+          "Default": "db.t3.micro",
           "ConstraintDescription": "must select a valid database instance type."
       },
       "DBUser": {
diff --git a/static/Reliability/300_Testing_for_Resiliency_of_EC2_RDS_and_S3/Code/CloudFormation/mySQL_rds_readreplica.json b/static/Reliability/300_Testing_for_Resiliency_of_EC2_RDS_and_S3/Code/CloudFormation/mySQL_rds_readreplica.json
index a6cab61aa..6bf96b020 100644
--- a/static/Reliability/300_Testing_for_Resiliency_of_EC2_RDS_and_S3/Code/CloudFormation/mySQL_rds_readreplica.json
+++ b/static/Reliability/300_Testing_for_Resiliency_of_EC2_RDS_and_S3/Code/CloudFormation/mySQL_rds_readreplica.json
@@ -33,7 +33,6 @@
       "Description" : "DB Instance Class",
       "Type": "String",
       "AllowedValues": [
-          "db.t2.micro",
           "db.t3.micro",
           "db.t3.small",
           "db.t3.medium",
@@ -47,7 +46,7 @@
           "db.m5.12xlarge",
           "db.m5.24xlarge"
       ],
-      "Default": "db.t2.micro",
+      "Default": "db.t3.micro",
       "ConstraintDescription": "must select a valid database instance type."
     }
   },
diff --git a/static/Reliability/Disaster_Recovery/Code/BackupAndRestore.yaml b/static/Reliability/Disaster_Recovery/Code/BackupAndRestore.yaml
index 94fa2f0ce..5c0d2a11d 100644
--- a/static/Reliability/Disaster_Recovery/Code/BackupAndRestore.yaml
+++ b/static/Reliability/Disaster_Recovery/Code/BackupAndRestore.yaml
@@ -274,7 +274,7 @@ Resources:
       DBName: unishop
       DBInstanceIdentifier: !Ref 'AWS::StackName'
       Engine: MySQL
-      DBInstanceClass: db.t2.micro
+      DBInstanceClass: db.t3.micro
       Port: '3306'
       MasterUsername: UniShopAppV1User
       MasterUserPassword: UniShopAppV1Password
diff --git a/static/Reliability/Disaster_Recovery/Code/BackupAndRestoreDB.yaml b/static/Reliability/Disaster_Recovery/Code/BackupAndRestoreDB.yaml
index cecc4977c..b68d7a671 100644
--- a/static/Reliability/Disaster_Recovery/Code/BackupAndRestoreDB.yaml
+++ b/static/Reliability/Disaster_Recovery/Code/BackupAndRestoreDB.yaml
@@ -87,7 +87,7 @@ Resources:
       DBName: unishop
       DBInstanceIdentifier: !Ref 'AWS::StackName'
       Engine: MySQL
-      DBInstanceClass: db.t2.micro
+      DBInstanceClass: db.t3.micro
       Port: '3306'
       MasterUsername: UniShopAppV1User
       MasterUserPassword: UniShopAppV1Password
diff --git a/static/Security/300_Multilayered_API_Security_with_Cognito_and_WAF/Code/templates/section1/section1-base.yaml b/static/Security/300_Multilayered_API_Security_with_Cognito_and_WAF/Code/templates/section1/section1-base.yaml
index 24b05c5a6..c586ec97b 100644
--- a/static/Security/300_Multilayered_API_Security_with_Cognito_and_WAF/Code/templates/section1/section1-base.yaml
+++ b/static/Security/300_Multilayered_API_Security_with_Cognito_and_WAF/Code/templates/section1/section1-base.yaml
@@ -514,7 +514,7 @@ Resources:
     Type: AWS::RDS::DBInstance
     Properties:
       AllocatedStorage: 20
-      DBInstanceClass: db.t2.micro
+      DBInstanceClass: db.t3.micro
       DBName: !Ref RDSDBName
       Engine: mysql
       MasterUsername: !Ref RDSUserName