diff --git a/src/utils/adaptive_learning.py b/src/utils/adaptive_learning.py
index 86592855..b92c0a75 100644
--- a/src/utils/adaptive_learning.py
+++ b/src/utils/adaptive_learning.py
@@ -1,7 +1,7 @@
 """Adaptive learning paths and personalization system."""
 
 from typing import Dict, List, Optional
-from datetime import datetime
+from datetime import datetime, timezone
 
 
 class AdaptiveLearningManager:
@@ -22,8 +22,8 @@ def create_user_profile(
             "learning_style": learning_style,
             "preferred_difficulty": "Beginner",
             "learning_pace": "Medium",
-            "created_at": datetime.utcnow().isoformat(),
-            "updated_at": datetime.utcnow().isoformat(),
+            "created_at": datetime.now(timezone.utc).isoformat(),
+            "updated_at": datetime.now(timezone.utc).isoformat(),
         }
         self.user_profiles[user_id] = profile
         return profile
@@ -38,7 +38,7 @@ def assess_skill_level(self, user_id: str, skill: str) -> Dict:
             "skill": skill,
             "level": "Beginner",
             "confidence": 0.0,
-            "assessed_at": datetime.utcnow().isoformat(),
+            "assessed_at": datetime.now(timezone.utc).isoformat(),
         }
         return assessment
 
@@ -80,7 +80,7 @@ def record_progress(
             "item_id": item_id,
             "score": score,
             "time_spent_minutes": time_spent,
-            "recorded_at": datetime.utcnow().isoformat(),
+            "recorded_at": datetime.now(timezone.utc).isoformat(),
         }
         self.performance_history[user_id].append(record)
 
@@ -109,7 +109,7 @@ def _adapt_path(self, user_id: str):
             profile["preferred_difficulty"] = "Beginner"
             profile["learning_pace"] = "Slow"
 
-        profile["updated_at"] = datetime.utcnow().isoformat()
+        profile["updated_at"] = datetime.now(timezone.utc).isoformat()
 
     def get_next_recommendation(self, user_id: str) -> Optional[Dict]:
         """Get next recommended item in adaptive path."""
diff --git a/src/utils/certification.py b/src/utils/certification.py
index ea48264b..08e9fdb8 100644
--- a/src/utils/certification.py
+++ b/src/utils/certification.py
@@ -1,7 +1,7 @@
 """Learning outcome assessment and certification system."""
 
 from typing import Dict, List, Optional
-from datetime import datetime
+from datetime import datetime, timezone
 import hashlib
 
 
@@ -28,7 +28,7 @@ def create_assessment(
             "skill": skill,
             "difficulty": difficulty,
             "questions": questions,
-            "created_at": datetime.utcnow().isoformat(),
+            "created_at": datetime.now(timezone.utc).isoformat(),
             "score": None,
             "passed": False,
             "completed_at": None,
@@ -48,7 +48,7 @@ def submit_assessment(
 
         assessment["score"] = score
         assessment["passed"] = score >= 70
-        assessment["completed_at"] = datetime.utcnow().isoformat()
+        assessment["completed_at"] = datetime.now(timezone.utc).isoformat()
 
         if assessment["passed"]:
             self._issue_certificate(assessment)
@@ -77,7 +77,7 @@ def _issue_certificate(self, assessment: Dict):
             "skill": assessment["skill"],
             "difficulty": assessment["difficulty"],
             "score": assessment["score"],
-            "issued_at": datetime.utcnow().isoformat(),
+            "issued_at": datetime.now(timezone.utc).isoformat(),
             "valid_until": None,
             "verification_code": self._generate_verification_code(cert_id),
         }
@@ -86,7 +86,7 @@ def _issue_certificate(self, assessment: Dict):
 
     def _generate_verification_code(self, cert_id: str) -> str:
         """Generate unique verification code."""
-        data = f"{cert_id}{datetime.utcnow().isoformat()}".encode()
+        data = f"{cert_id}{datetime.now(timezone.utc).isoformat()}".encode()
         return hashlib.sha256(data).hexdigest()[:16]
 
     def issue_digital_badge(self, user_id: str, skill: str, level: str) -> Dict:
@@ -97,7 +97,7 @@ def issue_digital_badge(self, user_id: str, skill: str, level: str) -> Dict:
             "user_id": user_id,
             "skill": skill,
             "level": level,
-            "issued_at": datetime.utcnow().isoformat(),
+            "issued_at": datetime.now(timezone.utc).isoformat(),
             "icon_url": f"/badges/{skill.lower()}_{level.lower()}.png",
             "description": f"{level} {skill} Badge",
         }