diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 4fd7c32..0ce04c2 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -94,6 +94,6 @@ dependencies {
 
     implementation(platform(libs.compose.bom))
     implementation(libs.androidx.activity.compose)
-    implementation(libs.compose.uiToolingPreview)
-    implementation(libs.compose.uiTooling)
+    debugImplementation(libs.compose.uiToolingPreview)
+    debugImplementation(libs.compose.uiTooling)
 }
diff --git a/app/src/main/kotlin/plus/rua/project/MainActivity.kt b/app/src/main/kotlin/plus/rua/project/MainActivity.kt
index b30b016..9a7a2f0 100644
--- a/app/src/main/kotlin/plus/rua/project/MainActivity.kt
+++ b/app/src/main/kotlin/plus/rua/project/MainActivity.kt
@@ -7,7 +7,6 @@ import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.compose.runtime.Composable
-import androidx.compose.ui.tooling.preview.Preview
 import plus.rua.project.ui.CalendarMonthView
 
 class MainActivity : ComponentActivity() {
@@ -28,9 +27,3 @@ class MainActivity : ComponentActivity() {
         }
     }
 }
-
-@Preview
-@Composable
-fun AppAndroidPreview() {
-    CalendarMonthView()
-}
diff --git a/core/build.gradle.kts b/core/build.gradle.kts
index 81b99fc..55290c8 100644
--- a/core/build.gradle.kts
+++ b/core/build.gradle.kts
@@ -49,8 +49,8 @@ dependencies {
     implementation(libs.compose.animation)
     implementation(libs.compose.material3)
     implementation(libs.compose.ui)
-    implementation(libs.compose.uiToolingPreview)
-    implementation(libs.compose.uiTooling)
+    debugImplementation(libs.compose.uiToolingPreview)
+    debugImplementation(libs.compose.uiTooling)
 
     implementation(libs.kotlinx.datetime)
     implementation(libs.tyme4kt)
diff --git a/core/src/main/kotlin/plus/rua/project/ui/BottomCard.kt b/core/src/main/kotlin/plus/rua/project/ui/BottomCard.kt
index eaffab3..3363d26 100644
--- a/core/src/main/kotlin/plus/rua/project/ui/BottomCard.kt
+++ b/core/src/main/kotlin/plus/rua/project/ui/BottomCard.kt
@@ -27,7 +27,6 @@ import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.semantics.contentDescription
 import androidx.compose.ui.semantics.semantics
-import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import kotlinx.datetime.LocalDate
@@ -182,19 +181,3 @@ fun BottomCard(
         }
     }
 }
-
-@Preview
-@Composable
-private fun BottomCardPreview() {
-    BottomCard(
-        isCollapsed = false,
-        selectedDate = kotlinx.datetime.LocalDate(2026, 5, 21),
-        today = kotlinx.datetime.LocalDate(2026, 5, 21),
-        shiftKind = plus.rua.project.ShiftKind.WORK,
-        onDrag = {},
-        onDragEnd = {},
-        onExpandDrag = {},
-        onExpandDragEnd = {},
-        dragRangePx = 300f
-    )
-}
diff --git a/core/src/main/kotlin/plus/rua/project/ui/DayCell.kt b/core/src/main/kotlin/plus/rua/project/ui/DayCell.kt
index 2d68467..1c4791a 100644
--- a/core/src/main/kotlin/plus/rua/project/ui/DayCell.kt
+++ b/core/src/main/kotlin/plus/rua/project/ui/DayCell.kt
@@ -31,7 +31,6 @@ import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextOverflow
-import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.zIndex
@@ -276,17 +275,3 @@ fun DayCell(
         }
     }
 }
-
-@Preview
-@Composable
-private fun DayCellPreview() {
-    DayCell(
-        date = LocalDate(2026, 5, 21),
-        isCurrentMonth = true,
-        isSelected = true,
-        isToday = true,
-        shiftKind = ShiftKind.WORK,
-        showLegalHoliday = false,
-        onClick = {}
-    )
-}
diff --git a/core/src/main/kotlin/plus/rua/project/ui/MonthHeader.kt b/core/src/main/kotlin/plus/rua/project/ui/MonthHeader.kt
index ee3079c..7db15ff 100644
--- a/core/src/main/kotlin/plus/rua/project/ui/MonthHeader.kt
+++ b/core/src/main/kotlin/plus/rua/project/ui/MonthHeader.kt
@@ -23,7 +23,6 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.graphicsLayer
-import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 
@@ -109,15 +108,3 @@ fun MonthHeader(
         }
     }
 }
-
-@Preview
-@Composable
-private fun MonthHeaderPreview() {
-    MonthHeader(
-        year = 2026,
-        month = 5,
-        weekNumber = 21,
-        showToday = true,
-        onToday = {}
-    )
-}
diff --git a/core/src/main/kotlin/plus/rua/project/ui/WeekdayHeader.kt b/core/src/main/kotlin/plus/rua/project/ui/WeekdayHeader.kt
index dfa031f..643b665 100644
--- a/core/src/main/kotlin/plus/rua/project/ui/WeekdayHeader.kt
+++ b/core/src/main/kotlin/plus/rua/project/ui/WeekdayHeader.kt
@@ -10,7 +10,6 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.semantics.heading
 import androidx.compose.ui.text.style.TextAlign
-import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 
 private val WEEKDAY_LABELS = listOf("一", "二", "三", "四", "五", "六", "日")
@@ -39,9 +38,3 @@ fun WeekdayHeader(modifier: Modifier = Modifier) {
         }
     }
 }
-
-@Preview
-@Composable
-private fun WeekdayHeaderPreview() {
-    WeekdayHeader()
-}
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index eecaa48..3048b8b 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -36,7 +36,6 @@ compose-runtime = { module = "androidx.compose.runtime:runtime" }
 compose-ui = { module = "androidx.compose.ui:ui" }
 compose-uiTooling = { module = "androidx.compose.ui:ui-tooling" }
 compose-uiToolingPreview = { module = "androidx.compose.ui:ui-tooling-preview" }
-kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
 kotlinx-coroutines-test = "org.jetbrains.kotlinx:kotlinx-coroutines-test:1.11.0"
 kotlinx-datetime = { module = "org.jetbrains.kotlinx:kotlinx-datetime", version.ref = "kotlinx-datetime" }
 sketch-animated-gif = { module = "io.github.panpf.sketch4:sketch-animated-gif", version.ref = "sketch" }