diff --git a/gradle.properties b/gradle.properties
index 041f178..3aa55fa 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -16,7 +16,7 @@ org.gradle.caching=true
 group=io.ballerina
 version=1.3.1-SNAPSHOT
 
-ballerinaLangVersion=2201.10.0-20241007-143200-6b69ca80
+ballerinaLangVersion=2201.10.0-20241011-161100-51978649
 githubSpotbugsVersion=6.0.18
 githubJohnrengelmanShadowVersion=8.1.1
 underCouchDownloadVersion=5.4.0
diff --git a/testobserve/native/src/main/java/org/ballerina/testobserve/NativeUtils.java b/testobserve/native/src/main/java/org/ballerina/testobserve/NativeUtils.java
index 66b4f4a..ce140b0 100644
--- a/testobserve/native/src/main/java/org/ballerina/testobserve/NativeUtils.java
+++ b/testobserve/native/src/main/java/org/ballerina/testobserve/NativeUtils.java
@@ -37,6 +37,7 @@ public static void sleep(Environment env, long delayMillis) {
         env.yieldAndRun(() -> {
             try {
                 Thread.sleep(delayMillis);
+                return null;
             } catch (InterruptedException e) {
                 throw ErrorCreator.createError(StringUtils.fromString("error occurred during sleep"), e);
             }