diff --git a/adapters/in-web/src/main/kotlin/com/pokit/content/ContentController.kt b/adapters/in-web/src/main/kotlin/com/pokit/content/ContentController.kt
index 0ca8feb2..a5111636 100644
--- a/adapters/in-web/src/main/kotlin/com/pokit/content/ContentController.kt
+++ b/adapters/in-web/src/main/kotlin/com/pokit/content/ContentController.kt
@@ -15,6 +15,7 @@ import com.pokit.content.dto.response.ContentResponse
 import com.pokit.content.dto.response.ContentsResponse
 import com.pokit.content.dto.response.toResponse
 import com.pokit.content.exception.ContentErrorCode
+import com.pokit.content.model.Content
 import com.pokit.content.port.`in`.ContentUseCase
 import io.swagger.v3.oas.annotations.Operation
 import jakarta.validation.Valid
@@ -191,6 +192,16 @@ class ContentController(
             .wrapUnit()
     }
 
+    @PatchMapping("/thumbnail/{contentId}")
+    @Operation(summary = "썸네일 수정 API")
+    fun updateThumbnail(
+        @AuthenticationPrincipal user: PrincipalUser,
+        @PathVariable("contentId") contentId: Long,
+        @RequestBody request: UpdateThumbnailRequest
+    ): ResponseEntity<Content> {
+        return contentUseCase.updateThumbnail(user.id, contentId,request.toDto())
+            .wrapOk()
+    }
 
 }
 
diff --git a/adapters/in-web/src/main/kotlin/com/pokit/content/dto/request/UpdateThumbnailRequest.kt b/adapters/in-web/src/main/kotlin/com/pokit/content/dto/request/UpdateThumbnailRequest.kt
new file mode 100644
index 00000000..c9402591
--- /dev/null
+++ b/adapters/in-web/src/main/kotlin/com/pokit/content/dto/request/UpdateThumbnailRequest.kt
@@ -0,0 +1,12 @@
+package com.pokit.content.dto.request
+
+import io.swagger.v3.oas.annotations.media.Schema
+import jakarta.validation.constraints.NotBlank
+
+data class UpdateThumbnailRequest(
+    @field:Schema(description = "수정할 썸네일 링크")
+    @field:NotBlank
+    val thumbnail: String,
+)
+
+internal fun UpdateThumbnailRequest.toDto() = thumbnail
diff --git a/application/src/main/kotlin/com/pokit/content/port/in/ContentUseCase.kt b/application/src/main/kotlin/com/pokit/content/port/in/ContentUseCase.kt
index 10db9be7..91c3b038 100644
--- a/application/src/main/kotlin/com/pokit/content/port/in/ContentUseCase.kt
+++ b/application/src/main/kotlin/com/pokit/content/port/in/ContentUseCase.kt
@@ -4,6 +4,7 @@ import com.pokit.content.dto.request.CategorizeCommand
 import com.pokit.content.dto.request.ContentCommand
 import com.pokit.content.dto.request.ContentSearchCondition
 import com.pokit.content.dto.response.*
+import com.pokit.content.model.Content
 import com.pokit.user.model.User
 import org.springframework.data.domain.Pageable
 import org.springframework.data.domain.Slice
@@ -45,4 +46,6 @@ interface ContentUseCase {
     fun deleteUncategorized(userId: Long, contentIds: List<Long>)
 
     fun categorize(userId: Long, command: CategorizeCommand)
+
+    fun updateThumbnail(userId: Long, contentId: Long, thumbnail: String): Content
 }
diff --git a/application/src/main/kotlin/com/pokit/content/port/service/ContentService.kt b/application/src/main/kotlin/com/pokit/content/port/service/ContentService.kt
index 158a6773..1a783c3f 100644
--- a/application/src/main/kotlin/com/pokit/content/port/service/ContentService.kt
+++ b/application/src/main/kotlin/com/pokit/content/port/service/ContentService.kt
@@ -189,6 +189,13 @@ class ContentService(
         contentPort.updateCategoryId(contents, category.categoryId)
     }
 
+    @Transactional
+    override fun updateThumbnail(userId: Long, contentId: Long, thumbnail: String): Content {
+        val content = verifyContent(userId, contentId)
+        content.modifyThumbnail(thumbnail)
+        return contentPort.persist(content)
+    }
+
     private fun verifyContent(userId: Long, contentId: Long): Content {
         return contentPort.loadByUserIdAndId(userId, contentId)
             ?: throw NotFoundCustomException(ContentErrorCode.NOT_FOUND_CONTENT)
diff --git a/domain/src/main/kotlin/com/pokit/content/model/Content.kt b/domain/src/main/kotlin/com/pokit/content/model/Content.kt
index af5176f0..ab7fe6d6 100644
--- a/domain/src/main/kotlin/com/pokit/content/model/Content.kt
+++ b/domain/src/main/kotlin/com/pokit/content/model/Content.kt
@@ -37,6 +37,10 @@ data class Content(
             else -> domain
         }
     }
+
+    fun modifyThumbnail(thumbnail: String) {
+        this.thumbNail = thumbnail
+    }
 }
 
 data class ContentInfo(