diff --git a/ballerina/Dependencies.toml b/ballerina/Dependencies.toml
index 2814d89a..af2ebfdd 100644
--- a/ballerina/Dependencies.toml
+++ b/ballerina/Dependencies.toml
@@ -5,7 +5,7 @@
 
 [ballerina]
 dependencies-toml-version = "2"
-distribution-version = "2201.8.0"
+distribution-version = "2201.9.0-20240403-114600-ceb51559"
 
 [[package]]
 org = "ballerina"
@@ -28,6 +28,26 @@ modules = [
 	{org = "ballerina", packageName = "jballerina.java", moduleName = "jballerina.java"}
 ]
 
+[[package]]
+org = "ballerina"
+name = "lang.__internal"
+version = "0.0.0"
+scope = "testOnly"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.object"}
+]
+
+[[package]]
+org = "ballerina"
+name = "lang.array"
+version = "0.0.0"
+scope = "testOnly"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.__internal"}
+]
+
 [[package]]
 org = "ballerina"
 name = "lang.error"
@@ -37,6 +57,12 @@ dependencies = [
 	{org = "ballerina", name = "jballerina.java"}
 ]
 
+[[package]]
+org = "ballerina"
+name = "lang.object"
+version = "0.0.0"
+scope = "testOnly"
+
 [[package]]
 org = "ballerina"
 name = "lang.value"
@@ -64,7 +90,7 @@ modules = [
 [[package]]
 org = "ballerina"
 name = "observe"
-version = "1.2.2"
+version = "1.2.3"
 scope = "testOnly"
 dependencies = [
 	{org = "ballerina", name = "jballerina.java"}
@@ -77,6 +103,7 @@ version = "0.0.0"
 scope = "testOnly"
 dependencies = [
 	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.array"},
 	{org = "ballerina", name = "lang.error"}
 ]
 modules = [
diff --git a/gradle.properties b/gradle.properties
index a20a3659..c89fa462 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,7 +1,7 @@
 org.gradle.caching=true
 group=io.ballerina.stdlib
 version=1.9.2-SNAPSHOT
-ballerinaLangVersion=2201.8.0
+ballerinaLangVersion=2201.9.0-20240403-114600-ceb51559
 
 puppycrawlCheckstyleVersion=10.12.0
 githubJohnrengelmanShadowVersion=8.1.1
@@ -18,5 +18,5 @@ gsonVersion=2.8.8
 # Dependencies
 stdlibIoVersion=1.6.0
 stdlibLogVersion=2.9.0
-observeVersion=1.2.0
-observeInternalVersion=1.2.0
+observeVersion=1.2.3-20240403-143400-5f0247b
+observeInternalVersion=1.2.2-20240403-152100-98fc6e9