diff --git a/PROJECTS/advanced/bug-bounty-platform/backend/app/core/enums.py b/PROJECTS/advanced/bug-bounty-platform/backend/app/core/enums.py
index 1b56a8a1..0c151ad7 100644
--- a/PROJECTS/advanced/bug-bounty-platform/backend/app/core/enums.py
+++ b/PROJECTS/advanced/bug-bounty-platform/backend/app/core/enums.py
@@ -3,7 +3,7 @@
 enums.py
 """
 
-from enum import Enum
+from enum import Enum, StrEnum
 from typing import Any
 
 import sqlalchemy as sa
@@ -46,7 +46,7 @@ class SafeEnum(sa.Enum):
             raise
 
 
-class Environment(str, Enum):
+class Environment(StrEnum):
     """
     Application environment.
     """
@@ -55,7 +55,7 @@ class Environment(str, Enum):
     PRODUCTION = "production"
 
 
-class UserRole(str, Enum):
+class UserRole(StrEnum):
     """
     User roles for authorization.
     """
@@ -65,7 +65,7 @@ class UserRole(str, Enum):
     ADMIN = "admin"
 
 
-class TokenType(str, Enum):
+class TokenType(StrEnum):
     """
     JWT token types.
     """
@@ -73,7 +73,7 @@ class TokenType(str, Enum):
     REFRESH = "refresh"
 
 
-class HealthStatus(str, Enum):
+class HealthStatus(StrEnum):
     """
     Health check status values.
     """
@@ -82,7 +82,7 @@ class HealthStatus(str, Enum):
     DEGRADED = "degraded"
 
 
-class ProgramStatus(str, Enum):
+class ProgramStatus(StrEnum):
     """
     Bug bounty program lifecycle status.
     """
@@ -92,7 +92,7 @@ class ProgramStatus(str, Enum):
     CLOSED = "closed"
 
 
-class ProgramVisibility(str, Enum):
+class ProgramVisibility(StrEnum):
     """
     Bug bounty program visibility level.
     """
@@ -101,7 +101,7 @@ class ProgramVisibility(str, Enum):
     INVITE_ONLY = "invite_only"
 
 
-class AssetType(str, Enum):
+class AssetType(StrEnum):
     """
     Type of asset in a bug bounty program scope.
     """
@@ -113,7 +113,7 @@ class AssetType(str, Enum):
     OTHER = "other"
 
 
-class Severity(str, Enum):
+class Severity(StrEnum):
     """
     Vulnerability severity levels aligned with CVSS.
     """
@@ -124,7 +124,7 @@ class Severity(str, Enum):
     INFORMATIONAL = "informational"
 
 
-class ReportStatus(str, Enum):
+class ReportStatus(StrEnum):
     """
     Vulnerability report lifecycle status.
     """
diff --git a/PROJECTS/advanced/encrypted-p2p-chat/backend/app/core/enums.py b/PROJECTS/advanced/encrypted-p2p-chat/backend/app/core/enums.py
index b4270c8c..013a04a6 100644
--- a/PROJECTS/advanced/encrypted-p2p-chat/backend/app/core/enums.py
+++ b/PROJECTS/advanced/encrypted-p2p-chat/backend/app/core/enums.py
@@ -3,10 +3,10 @@
 Application enums for type safety
 """
 
-from enum import Enum
+from enum import StrEnum
 
 
-class MessageStatus(str, Enum):
+class MessageStatus(StrEnum):
     """
     Message delivery status
     """
@@ -17,7 +17,7 @@ class MessageStatus(str, Enum):
     FAILED = "failed"
 
 
-class PresenceStatus(str, Enum):
+class PresenceStatus(StrEnum):
     """
     User presence status
     """
@@ -26,7 +26,7 @@ class PresenceStatus(str, Enum):
     OFFLINE = "offline"
 
 
-class RoomType(str, Enum):
+class RoomType(StrEnum):
     """
     Chat room types
     """
diff --git a/PROJECTS/beginner/simple-vulnerability-scanner/internal/osv/client.go b/PROJECTS/beginner/simple-vulnerability-scanner/internal/osv/client.go
index f0383cf6..522e76b9 100644
--- a/PROJECTS/beginner/simple-vulnerability-scanner/internal/osv/client.go
+++ b/PROJECTS/beginner/simple-vulnerability-scanner/internal/osv/client.go
@@ -162,7 +162,7 @@ func (c *Client) queryBatch(
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("User-Agent", userAgent)
 
-	resp, err := c.http.Do(req)
+	resp, err := c.http.Do(req) //nolint:gosec // hardcoded OSV API endpoint
 	if err != nil {
 		return nil, err
 	}
@@ -191,7 +191,7 @@ func (c *Client) fetchVuln(
 	}
 	req.Header.Set("User-Agent", userAgent)
 
-	resp, err := c.http.Do(req)
+	resp, err := c.http.Do(req) //nolint:gosec // hardcoded OSV API endpoint
 	if err != nil {
 		return nil, err
 	}
diff --git a/PROJECTS/beginner/simple-vulnerability-scanner/internal/pypi/cache.go b/PROJECTS/beginner/simple-vulnerability-scanner/internal/pypi/cache.go
index a589cc15..6f7e51b4 100644
--- a/PROJECTS/beginner/simple-vulnerability-scanner/internal/pypi/cache.go
+++ b/PROJECTS/beginner/simple-vulnerability-scanner/internal/pypi/cache.go
@@ -67,12 +67,12 @@ func (c *Cache) Set(key string, entry *CacheEntry) error {
 
 	if _, writeErr := tmp.Write(data); writeErr != nil {
 		_ = tmp.Close()           //nolint:errcheck
-		_ = os.Remove(tmp.Name()) //nolint:errcheck
+		_ = os.Remove(tmp.Name()) //nolint:errcheck,gosec
 		return writeErr
 	}
 	_ = tmp.Close() //nolint:errcheck
 
-	return os.Rename(tmp.Name(), c.path(key))
+	return os.Rename(tmp.Name(), c.path(key)) //nolint:gosec
 }
 
 // Touch refreshes the CachedAt timestamp without changing stored data
diff --git a/PROJECTS/beginner/simple-vulnerability-scanner/internal/pypi/client.go b/PROJECTS/beginner/simple-vulnerability-scanner/internal/pypi/client.go
index 6205d9b2..bab77250 100644
--- a/PROJECTS/beginner/simple-vulnerability-scanner/internal/pypi/client.go
+++ b/PROJECTS/beginner/simple-vulnerability-scanner/internal/pypi/client.go
@@ -202,7 +202,7 @@ func (c *Client) doWithRetry(
 			}
 		}
 
-		resp, err := c.http.Do(req)
+		resp, err := c.http.Do(req) //nolint:gosec
 		if err != nil {
 			lastErr = err
 			continue
diff --git a/PROJECTS/intermediate/api-security-scanner/backend/core/enums.py b/PROJECTS/intermediate/api-security-scanner/backend/core/enums.py
index 4101d793..7882a856 100644
--- a/PROJECTS/intermediate/api-security-scanner/backend/core/enums.py
+++ b/PROJECTS/intermediate/api-security-scanner/backend/core/enums.py
@@ -2,10 +2,10 @@
 Enum definitions for the application for type safety
 """
 
-from enum import Enum
+from enum import StrEnum
 
 
-class ScanStatus(str, Enum):
+class ScanStatus(StrEnum):
     """
     Enum for scan result status
     """
@@ -15,7 +15,7 @@ class ScanStatus(str, Enum):
     ERROR = "error"
 
 
-class Severity(str, Enum):
+class Severity(StrEnum):
     """
     Enum for vulnerability severity levels
     """
@@ -27,7 +27,7 @@ class Severity(str, Enum):
     INFO = "info"
 
 
-class TestType(str, Enum):
+class TestType(StrEnum):
     """
     Enum for available security test types
     """