diff --git a/src/main/java/com/example/solidconnection/community/post/domain/PostCategory.java b/src/main/java/com/example/solidconnection/community/post/domain/PostCategory.java
index 3f8819749..04d6c2eb5 100644
--- a/src/main/java/com/example/solidconnection/community/post/domain/PostCategory.java
+++ b/src/main/java/com/example/solidconnection/community/post/domain/PostCategory.java
@@ -1,5 +1,17 @@
 package com.example.solidconnection.community.post.domain;
 
+import java.util.Arrays;
+import java.util.Set;
+import java.util.stream.Collectors;
+
 public enum PostCategory {
-    전체, 자유, 질문
+    전체, 자유, 질문;
+
+    private static final Set<String> NAMES = Arrays.stream(values())
+            .map(Enum::name)
+            .collect(Collectors.toSet());
+
+    public static boolean isValid(String name){
+        return name != null && NAMES.contains(name);
+    }
 }
diff --git a/src/main/java/com/example/solidconnection/community/post/service/PostCommandService.java b/src/main/java/com/example/solidconnection/community/post/service/PostCommandService.java
index 46a40c8ae..5b2b9b058 100644
--- a/src/main/java/com/example/solidconnection/community/post/service/PostCommandService.java
+++ b/src/main/java/com/example/solidconnection/community/post/service/PostCommandService.java
@@ -27,7 +27,6 @@
 import java.util.List;
 import java.util.Objects;
 import lombok.RequiredArgsConstructor;
-import org.apache.commons.lang3.EnumUtils;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.multipart.MultipartFile;
@@ -137,7 +136,7 @@ private void validateQuestion(Post post) {
     }
 
     private void validatePostCategory(String category) {
-        if (!EnumUtils.isValidEnum(PostCategory.class, category) || category.equals(PostCategory.전체.toString())) {
+        if (!PostCategory.isValid(category) || category.equals(PostCategory.전체.toString())) {
             throw new CustomException(INVALID_POST_CATEGORY);
         }
     }
diff --git a/src/main/java/com/example/solidconnection/community/post/service/PostQueryService.java b/src/main/java/com/example/solidconnection/community/post/service/PostQueryService.java
index 9beea5e8d..a67156e4d 100644
--- a/src/main/java/com/example/solidconnection/community/post/service/PostQueryService.java
+++ b/src/main/java/com/example/solidconnection/community/post/service/PostQueryService.java
@@ -27,7 +27,6 @@
 import java.util.Objects;
 import java.util.stream.Collectors;
 import lombok.RequiredArgsConstructor;
-import org.apache.commons.lang3.EnumUtils;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -103,7 +102,7 @@ private Boolean getIsLiked(Post post, SiteUser siteUser) {
     }
 
     private PostCategory validatePostCategory(String category) {
-        if (!EnumUtils.isValidEnum(PostCategory.class, category)) {
+        if (!PostCategory.isValid(category)) {
             throw new CustomException(INVALID_POST_CATEGORY);
         }
         return PostCategory.valueOf(category);