diff --git a/src/main/java/com/soptie/server/domain/challenge/MemberChallenge.java b/src/main/java/com/soptie/server/domain/challenge/MemberChallenge.java
index 41fc7e8e..bc5cf34b 100644
--- a/src/main/java/com/soptie/server/domain/challenge/MemberChallenge.java
+++ b/src/main/java/com/soptie/server/domain/challenge/MemberChallenge.java
@@ -19,4 +19,8 @@ public void achieve() {
 		this.achievedCount++;
 		this.achieved = true;
 	}
+
+	public void cancel() {
+		this.achievedCount--;
+	}
 }
diff --git a/src/main/java/com/soptie/server/domain/challenge/MemberChallengeService.java b/src/main/java/com/soptie/server/domain/challenge/MemberChallengeService.java
index cff21bb6..27d7a7d9 100644
--- a/src/main/java/com/soptie/server/domain/challenge/MemberChallengeService.java
+++ b/src/main/java/com/soptie/server/domain/challenge/MemberChallengeService.java
@@ -73,6 +73,10 @@ public void achieveMemberChallenge(long memberId) {
 
 	@Transactional
 	public void deleteHistory(long historyId) {
+		val history = challengeHistoryAdapter.findById(historyId);
+		val memberChallenge = memberChallengeAdapter.findById(history.getMemberChallengeId());
+		memberChallenge.cancel();
+		memberChallengeAdapter.update(memberChallenge);
 		challengeHistoryAdapter.deleteById(historyId);
 	}
 }
diff --git a/src/main/java/com/soptie/server/persistence/adapter/challenge/ChallengeHistoryAdapter.java b/src/main/java/com/soptie/server/persistence/adapter/challenge/ChallengeHistoryAdapter.java
index 13ddcbee..8ed49a52 100644
--- a/src/main/java/com/soptie/server/persistence/adapter/challenge/ChallengeHistoryAdapter.java
+++ b/src/main/java/com/soptie/server/persistence/adapter/challenge/ChallengeHistoryAdapter.java
@@ -6,6 +6,8 @@
 
 import org.springframework.stereotype.Component;
 
+import com.soptie.server.common.exception.ExceptionCode;
+import com.soptie.server.common.exception.SoftieException;
 import com.soptie.server.domain.challenge.Challenge;
 import com.soptie.server.domain.challenge.ChallengeHistory;
 import com.soptie.server.domain.challenge.MemberChallenge;
@@ -39,4 +41,10 @@ public List<ChallengeHistory> findAllByMemberIdAndCreatedAtBetween(
 		return historyRepository.findAllByMemberIdAndCreatedAtBetween(memberId, startDateTime, endDateTime).stream()
 			.map(ChallengeHistoryEntity::toDomain).toList();
 	}
+
+	public ChallengeHistory findById(final long id) {
+		return historyRepository.findById(id)
+			.orElseThrow(() -> new SoftieException(ExceptionCode.NOT_FOUND, "ChallengeHistoryId: " + id))
+			.toDomain();
+	}
 }
diff --git a/src/main/java/com/soptie/server/persistence/adapter/challenge/MemberChallengeAdapter.java b/src/main/java/com/soptie/server/persistence/adapter/challenge/MemberChallengeAdapter.java
index ee463284..021e8e57 100644
--- a/src/main/java/com/soptie/server/persistence/adapter/challenge/MemberChallengeAdapter.java
+++ b/src/main/java/com/soptie/server/persistence/adapter/challenge/MemberChallengeAdapter.java
@@ -61,6 +61,10 @@ public List<MemberChallenge> findAllByMemberId(long memberId) {
 			.toList();
 	}
 
+	public MemberChallenge findById(long id) {
+		return find(id).toDomain();
+	}
+
 	private MemberChallengeEntity find(long id) {
 		return memberChallengeRepository.findById(id)
 			.orElseThrow(() -> new SoftieException(ExceptionCode.NOT_FOUND, "MemberChallenge ID: " + id));