diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/pom.xml b/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/pom.xml
index 7297f5964d9..09f8bd03525 100644
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/pom.xml
+++ b/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/pom.xml
@@ -22,7 +22,7 @@
     </dependencies>
 
     <properties>
-        <kotlin.compiler.apiVersion>1.3</kotlin.compiler.apiVersion>
+        <kotlin.compiler.apiVersion>1.4</kotlin.compiler.apiVersion>
     </properties>
 
     <build>
diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/src/main/kotlin/main.kt b/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/src/main/kotlin/main.kt
index a9bcc41867a..4d59097b6c3 100644
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/src/main/kotlin/main.kt
+++ b/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/src/main/kotlin/main.kt
@@ -1,5 +1,4 @@
-fun test2(s: Sequence<Int>) {
-    s.map { it }
-    s.shuffled()
+fun test2() {
+    "".uppercase()
 }
 
diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/verify.bsh b/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/verify.bsh
index 35221bfc555..3f6f8708f48 100644
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/verify.bsh
+++ b/libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/verify.bsh
@@ -1,7 +1,4 @@
 source(new File(basedir, "../../../verify-common.bsh").getAbsolutePath());
 
 assertBuildLogHasLine("[INFO] BUILD FAILURE");
-assertBuildLogHasLineThatContains("Unresolved reference. None of the following candidates is applicable because of receiver type mismatch:");
-assertBuildLogHasLineThatContains("public fun <T> Iterable<TypeVariable(T)>.shuffled(): List<TypeVariable(T)> defined in kotlin.collections");
-assertBuildLogHasLineThatContains("public fun <T> Iterable<TypeVariable(T)>.shuffled(random: java.util.Random): List<TypeVariable(T)> defined in kotlin.collections");
-assertBuildLogHasLineThatContains("public fun <T> Iterable<TypeVariable(T)>.shuffled(random: kotlin.random.Random): List<TypeVariable(T)> defined in kotlin.collections");
+assertBuildLogHasLineThatContains("Unresolved reference: uppercase");
\ No newline at end of file
diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/pom.xml b/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/pom.xml
index 02a67996013..aec79fadb46 100644
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/pom.xml
+++ b/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/pom.xml
@@ -22,7 +22,7 @@
     </dependencies>
 
     <properties>
-        <kotlin.compiler.languageVersion>1.3</kotlin.compiler.languageVersion>
+        <kotlin.compiler.languageVersion>1.5</kotlin.compiler.languageVersion>
     </properties>
 
     <build>
diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/src/main/kotlin/main.kt b/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/src/main/kotlin/main.kt
index 1793bf43ac4..d58096c1b35 100644
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/src/main/kotlin/main.kt
+++ b/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/src/main/kotlin/main.kt
@@ -1,7 +1 @@
-fun breakInWhenFrom14() {
-    while (true) {
-        when {
-            true -> break
-        }
-    }
-}
+fun <T> f(t: T): T!! = t!!
\ No newline at end of file
diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/verify.bsh b/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/verify.bsh
index bc9f0893ab5..ab85fb31e36 100644
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/verify.bsh
+++ b/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/verify.bsh
@@ -1,4 +1,4 @@
 source(new File(basedir, "../../../verify-common.bsh").getAbsolutePath());
 
 assertBuildLogHasLine("[INFO] BUILD FAILURE");
-assertBuildLogHasLineThatContains("'break' and 'continue' are not allowed in 'when' statements");
+assertBuildLogHasLineThatContains("The feature \"definitely not null type parameters\" is only available since language version 1.6");