diff --git a/src/main/java/roomescape/theme/business/ThemeService.java b/src/main/java/roomescape/theme/business/ThemeService.kt
similarity index 100%
rename from src/main/java/roomescape/theme/business/ThemeService.java
rename to src/main/java/roomescape/theme/business/ThemeService.kt
diff --git a/src/test/java/roomescape/theme/business/ThemeServiceTest.java b/src/test/java/roomescape/theme/business/ThemeServiceTest.kt
similarity index 100%
rename from src/test/java/roomescape/theme/business/ThemeServiceTest.java
rename to src/test/java/roomescape/theme/business/ThemeServiceTest.kt