diff --git a/build.gradle.kts b/build.gradle.kts
index 95853eb3..6dc52ab4 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -58,7 +58,10 @@ allprojects {
     }
 
     tasks.withType<KotlinCompile> {
-        kotlinOptions.jvmTarget = "1.8"
+        kotlinOptions {
+            jvmTarget = "1.8"
+            freeCompilerArgs = listOf("-Xjsr305=strict")
+        }
     }
 
     tasks.withType<AbstractArchiveTask> {