diff --git a/library/src/main/java/io/github/boguszpawlowski/composecalendar/selection/SelectionState.kt b/library/src/main/java/io/github/boguszpawlowski/composecalendar/selection/SelectionState.kt
index 029dfeb..d667d4a 100644
--- a/library/src/main/java/io/github/boguszpawlowski/composecalendar/selection/SelectionState.kt
+++ b/library/src/main/java/io/github/boguszpawlowski/composecalendar/selection/SelectionState.kt
@@ -11,8 +11,8 @@ import java.time.LocalDate
 
 @Stable
 public interface SelectionState {
-  public fun isDateSelected(date: LocalDate): Boolean
-  public fun onDateSelected(date: LocalDate)
+  public fun isDateSelected(date: LocalDate): Boolean = false
+  public fun onDateSelected(date: LocalDate) { }
 }
 
 /**
diff --git a/library/src/test/java/io/github/boguszpawlowski/composecalendar/selection/SelectionStateTest.kt b/library/src/test/java/io/github/boguszpawlowski/composecalendar/selection/SelectionStateTest.kt
index 267fe77..fbe25d4 100644
--- a/library/src/test/java/io/github/boguszpawlowski/composecalendar/selection/SelectionStateTest.kt
+++ b/library/src/test/java/io/github/boguszpawlowski/composecalendar/selection/SelectionStateTest.kt
@@ -2,6 +2,7 @@
 
 package io.github.boguszpawlowski.composecalendar.selection
 
+import io.kotest.assertions.throwables.shouldNotThrowAny
 import io.kotest.core.spec.style.ShouldSpec
 import io.kotest.matchers.collections.shouldContainExactly
 import io.kotest.matchers.shouldBe
@@ -135,4 +136,18 @@ internal class SelectionStateTest : ShouldSpec({
       state.selection.endOrNull() shouldBe null
     }
   }
+
+  context("Selection State interface default values") {
+    val myInterfaceWithNoMethods = object : SelectionState {}
+
+    should("Default isDateSelected to false") {
+      myInterfaceWithNoMethods.isDateSelected(today) shouldBe false
+    }
+
+    should("Have a default implementation that doesn't throw an exception for onDateSelected") {
+      shouldNotThrowAny {
+        myInterfaceWithNoMethods.onDateSelected(today)
+      }
+    }
+  }
 })