diff --git a/.changeset/ripe-forks-fall.md b/.changeset/ripe-forks-fall.md
new file mode 100644
index 0000000..926fc34
--- /dev/null
+++ b/.changeset/ripe-forks-fall.md
@@ -0,0 +1,5 @@
+---
+'@croquiscom/monolith': patch
+---
+
+Stack/buildFlexClassNames CSSProperties import 추가
diff --git a/src/components/stack/utils/buildFlexClassNames.ts b/src/components/stack/utils/buildFlexClassNames.ts
index 18ad82e..491a35e 100644
--- a/src/components/stack/utils/buildFlexClassNames.ts
+++ b/src/components/stack/utils/buildFlexClassNames.ts
@@ -1,13 +1,15 @@
+import { CSSProperties } from 'react';
+
 /** The props type of {@link buildFlexClassNames | 'buildFlexClassNames'}. */
 export interface FlexClassNamesParams {
   /** flex-direction 속성을 지정합니다. */
-  direction?: React.CSSProperties['flexDirection'];
+  direction?: CSSProperties['flexDirection'];
   /** flex-wrap 속성을 지정합니다. */
-  wrap?: React.CSSProperties['flexWrap'];
+  wrap?: CSSProperties['flexWrap'];
   /** align-items 속성을 지정합니다. */
-  align?: React.CSSProperties['alignItems'];
+  align?: CSSProperties['alignItems'];
   /** justify-content 속성을 지정합니다. */
-  justify?: React.CSSProperties['justifyContent'];
+  justify?: CSSProperties['justifyContent'];
 }
 
 /**
@@ -16,12 +18,7 @@ export interface FlexClassNamesParams {
  * @param props - {@link FlexClassNamesParams}를 참조하세요.
  * @returns 컴포넌트에 적용할 Flexbox 관련 CSS 클래스명을 반환합니다.
  */
-export const buildFlexClassNames = ({
-  direction,
-  wrap,
-  align,
-  justify,
-}: FlexClassNamesParams): string => {
+export const buildFlexClassNames = ({ direction, wrap, align, justify }: FlexClassNamesParams): string => {
   const classes: string[] = ['flex'];
 
   if (direction) {
@@ -38,4 +35,4 @@ export const buildFlexClassNames = ({
   }
 
   return classes.join(' ');
-};
\ No newline at end of file
+};