diff --git a/benchmarks/jmh/build.gradle b/benchmarks/jmh/build.gradle
index c082fdc0..b6315f32 100644
--- a/benchmarks/jmh/build.gradle
+++ b/benchmarks/jmh/build.gradle
@@ -11,7 +11,7 @@ dependencies {
 }
 
 kotlin {
-    jvmToolchain(11)
+    jvmToolchain(17)
 }
 
 jmh {
diff --git a/rxjava2-interop/build.gradle b/rxjava2-interop/build.gradle
index c01daeaf..77255d44 100644
--- a/rxjava2-interop/build.gradle
+++ b/rxjava2-interop/build.gradle
@@ -16,7 +16,7 @@ compileKotlin {
 }
 
 compileJava {
-    targetCompatibility(JavaVersion.VERSION_1_8)
+    targetCompatibility = JavaVersion.VERSION_1_8
 }
 
 publishing {
diff --git a/rxjava3-interop/build.gradle b/rxjava3-interop/build.gradle
index 28880570..69a6d579 100644
--- a/rxjava3-interop/build.gradle
+++ b/rxjava3-interop/build.gradle
@@ -16,7 +16,7 @@ compileKotlin {
 }
 
 compileJava {
-    targetCompatibility(JavaVersion.VERSION_1_8)
+    targetCompatibility = JavaVersion.VERSION_1_8
 }
 
 publishing {