diff --git a/kotlin-result-coroutines/build.gradle.kts b/kotlin-result-coroutines/build.gradle.kts
index debe6c1..0d32ab8 100644
--- a/kotlin-result-coroutines/build.gradle.kts
+++ b/kotlin-result-coroutines/build.gradle.kts
@@ -9,7 +9,7 @@ kotlin {
     sourceSets {
         all {
             languageSettings.apply {
-                useExperimentalAnnotation("kotlin.contracts.ExperimentalContracts")
+                optIn("kotlin.contracts.ExperimentalContracts")
             }
         }
 
diff --git a/kotlin-result/build.gradle.kts b/kotlin-result/build.gradle.kts
index 8433f0a..4880260 100644
--- a/kotlin-result/build.gradle.kts
+++ b/kotlin-result/build.gradle.kts
@@ -17,7 +17,7 @@ kotlin {
     sourceSets {
         all {
             languageSettings.apply {
-                useExperimentalAnnotation("kotlin.contracts.ExperimentalContracts")
+                optIn("kotlin.contracts.ExperimentalContracts")
             }
         }