diff --git a/app/src/main/java/com/sadellie/unitto/screens/common/AnimatedTopBarText.kt b/app/src/main/java/com/sadellie/unitto/screens/common/AnimatedTopBarText.kt
index 6ee339cc..9ac48eb0 100644
--- a/app/src/main/java/com/sadellie/unitto/screens/common/AnimatedTopBarText.kt
+++ b/app/src/main/java/com/sadellie/unitto/screens/common/AnimatedTopBarText.kt
@@ -29,7 +29,6 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import com.sadellie.unitto.R
 
@@ -52,7 +51,7 @@ fun AnimatedTopBarText(showAppName: Boolean) {
             text = if (showAppName) stringResource(R.string.app_name) else stringResource(R.string.hello_label),
             maxLines = 1,
             overflow = TextOverflow.Ellipsis,
-            style = MaterialTheme.typography.headlineSmall.copy(fontWeight = FontWeight.W600)
+            style = MaterialTheme.typography.titleLarge
         )
     }
 }
diff --git a/app/src/main/java/com/sadellie/unitto/ui/theme/Type.kt b/app/src/main/java/com/sadellie/unitto/ui/theme/Type.kt
index ddfb1eb6..56ab5f06 100644
--- a/app/src/main/java/com/sadellie/unitto/ui/theme/Type.kt
+++ b/app/src/main/java/com/sadellie/unitto/ui/theme/Type.kt
@@ -26,18 +26,20 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.sp
 import com.sadellie.unitto.R
 
-private val OPEN_SANS_FONT = FontFamily(
-    Font(R.font.opensans_regular, weight = FontWeight.W400),
-    Font(R.font.opensans_medium, weight = FontWeight.Medium)
+private val Montserrat = FontFamily(
+    Font(R.font.montserrat_light, weight = FontWeight.Light),
+    Font(R.font.montserrat_regular, weight = FontWeight.Normal),
+    Font(R.font.montserrat_medium, weight = FontWeight.Medium),
+    Font(R.font.montserrat_semibold, weight = FontWeight.SemiBold),
 )
 
-private val LATO_FONT = FontFamily(
+private val Lato = FontFamily(
     Font(R.font.lato_regular)
 )
 
 // This text style is used for text field
 val NumbersTextStyleDisplayLarge = TextStyle(
-    fontFamily = LATO_FONT,
+    fontFamily = Lato,
     fontWeight = FontWeight.W400,
     fontSize = 57.sp,
     lineHeight = 64.sp,
@@ -46,7 +48,7 @@ val NumbersTextStyleDisplayLarge = TextStyle(
 
 // This text style is used for secondary text field
 val NumbersTextStyleDisplayMedium = TextStyle(
-    fontFamily = LATO_FONT,
+    fontFamily = Lato,
     fontWeight = FontWeight.W400,
     fontSize = 38.sp,
     lineHeight = 42.sp,
@@ -55,7 +57,7 @@ val NumbersTextStyleDisplayMedium = TextStyle(
 
 // This text style is used for keyboard button
 val NumbersTextStyleTitleLarge = TextStyle(
-    fontFamily = LATO_FONT,
+    fontFamily = Lato,
     fontWeight = FontWeight.W600,
     fontSize = 26.sp,
     lineHeight = 32.sp,
@@ -64,108 +66,108 @@ val NumbersTextStyleTitleLarge = TextStyle(
 
 val AppTypography = Typography(
     displayLarge = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.W400,
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Normal,
         fontSize = 57.sp,
         lineHeight = 64.sp,
         letterSpacing = (-0.25).sp,
     ),
     displayMedium = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.W400,
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Normal,
         fontSize = 45.sp,
         lineHeight = 52.sp,
         letterSpacing = 0.sp,
     ),
     displaySmall = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.W400,
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Normal,
         fontSize = 36.sp,
         lineHeight = 44.sp,
         letterSpacing = 0.sp,
     ),
     headlineLarge = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.W400,
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Normal,
         fontSize = 32.sp,
         lineHeight = 40.sp,
         letterSpacing = 0.sp,
     ),
     headlineMedium = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.W400,
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Normal,
         fontSize = 28.sp,
         lineHeight = 36.sp,
         letterSpacing = 0.sp,
     ),
     headlineSmall = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.W400,
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Normal,
         fontSize = 24.sp,
         lineHeight = 32.sp,
         letterSpacing = 0.sp,
     ),
     titleLarge = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.W400,
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Medium,
         fontSize = 22.sp,
         lineHeight = 28.sp,
         letterSpacing = 0.sp,
     ),
     titleMedium = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.Medium,
-        fontSize = 16.sp,
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Bold,
+        fontSize = 18.sp,
         lineHeight = 24.sp,
         letterSpacing = 0.1.sp,
     ),
     titleSmall = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.Medium,
-        fontSize = 14.sp,
-        lineHeight = 20.sp,
-        letterSpacing = 0.1.sp,
-    ),
-    labelLarge = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
+        fontFamily = Montserrat,
         fontWeight = FontWeight.Medium,
         fontSize = 14.sp,
         lineHeight = 20.sp,
         letterSpacing = 0.1.sp,
     ),
     bodyLarge = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.W400,
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Normal,
         fontSize = 16.sp,
         lineHeight = 24.sp,
         letterSpacing = 0.5.sp,
     ),
     bodyMedium = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.W400,
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Normal,
         fontSize = 14.sp,
         lineHeight = 20.sp,
         letterSpacing = 0.25.sp,
     ),
     bodySmall = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
-        fontWeight = FontWeight.W400,
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Normal,
         fontSize = 12.sp,
         lineHeight = 16.sp,
         letterSpacing = 0.4.sp,
     ),
+    labelLarge = TextStyle(
+        fontFamily = Montserrat,
+        fontWeight = FontWeight.Medium,
+        fontSize = 14.sp,
+        lineHeight = 20.sp,
+        letterSpacing = 0.1.sp,
+    ),
     labelMedium = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
+        fontFamily = Montserrat,
         fontWeight = FontWeight.Medium,
         fontSize = 12.sp,
         lineHeight = 16.sp,
         letterSpacing = 0.5.sp,
     ),
     labelSmall = TextStyle(
-        fontFamily = OPEN_SANS_FONT,
+        fontFamily = Montserrat,
         fontWeight = FontWeight.Medium,
-        fontSize = 11.sp,
+        fontSize = 10.sp,
         lineHeight = 16.sp,
-        letterSpacing = 0.5.sp,
+        letterSpacing = 0.sp,
     ),
 )
diff --git a/app/src/main/res/font/montserrat_light.ttf b/app/src/main/res/font/montserrat_light.ttf
new file mode 100644
index 00000000..c5dfdb76
Binary files /dev/null and b/app/src/main/res/font/montserrat_light.ttf differ
diff --git a/app/src/main/res/font/montserrat_medium.ttf b/app/src/main/res/font/montserrat_medium.ttf
new file mode 100644
index 00000000..dfc7e2fc
Binary files /dev/null and b/app/src/main/res/font/montserrat_medium.ttf differ
diff --git a/app/src/main/res/font/montserrat_regular.ttf b/app/src/main/res/font/montserrat_regular.ttf
new file mode 100644
index 00000000..aa9033a8
Binary files /dev/null and b/app/src/main/res/font/montserrat_regular.ttf differ
diff --git a/app/src/main/res/font/montserrat_semibold.ttf b/app/src/main/res/font/montserrat_semibold.ttf
new file mode 100644
index 00000000..cbf44db9
Binary files /dev/null and b/app/src/main/res/font/montserrat_semibold.ttf differ
diff --git a/app/src/main/res/font/opensans_medium.ttf b/app/src/main/res/font/opensans_medium.ttf
deleted file mode 100644
index 6b419185..00000000
Binary files a/app/src/main/res/font/opensans_medium.ttf and /dev/null differ
diff --git a/app/src/main/res/font/opensans_regular.ttf b/app/src/main/res/font/opensans_regular.ttf
deleted file mode 100644
index 3a29f264..00000000
Binary files a/app/src/main/res/font/opensans_regular.ttf and /dev/null differ