diff --git a/README.md b/README.md
index 06577387..5847e4af 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# th2 common library (Java) (5.11.1)
+# th2 common library (Java) (5.12.0)
 
 ## Usage
 
@@ -511,6 +511,10 @@ dependencies {
 
 ## Release notes
 
+### 5.12.0-dev
+
++ Updated kubernetes-client: `6.12.1`
+
 ### 5.11.1-dev
 
 + Add `remove` and `clear` operations to `MapBuilder`
diff --git a/build.gradle b/build.gradle
index 0154af4c..223bc05c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -138,17 +138,17 @@ dependencies {
     implementation 'io.prometheus:simpleclient_httpserver'
     implementation 'io.prometheus:simpleclient_log4j2'
 
-    implementation("com.squareup.okio:okio:3.8.0") {
+    implementation("com.squareup.okio:okio:3.4.0") {
         because('fix vulnerability in transitive dependency <com.squareup.okhttp3:okhttp>')
     }
-    implementation("com.squareup.okhttp3:okhttp:4.12.0") {
+    implementation("com.squareup.okhttp3:okhttp:4.11.0") {
         because('fix vulnerability in transitive dependency <kubernetes-client>')
     }
-    implementation('com.squareup.okhttp3:logging-interceptor:4.12.0') {
+    implementation('com.squareup.okhttp3:logging-interceptor:4.11.0') {
         because('fix vulnerability in transitive dependency <kubernetes-client>')
     }
 
-    implementation("io.fabric8:kubernetes-client:6.10.0") {
+    implementation("io.fabric8:kubernetes-client:6.12.1") {
         exclude group: 'com.fasterxml.jackson.dataformat', module: 'jackson-dataformat-yaml'
     }
 
diff --git a/src/test/kotlin/com/exactpro/th2/common/util/TestMultiMapDeserializer.kt b/src/test/kotlin/com/exactpro/th2/common/util/TestMultiMapDeserializer.kt
index c949fdc6..809ecc13 100644
--- a/src/test/kotlin/com/exactpro/th2/common/util/TestMultiMapDeserializer.kt
+++ b/src/test/kotlin/com/exactpro/th2/common/util/TestMultiMapDeserializer.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2020-2021 Exactpro (Exactpro Systems Limited)
+ * Copyright 2020-2024 Exactpro (Exactpro Systems Limited)
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
@@ -20,10 +20,12 @@ import com.exactpro.th2.common.schema.strategy.route.json.RoutingStrategyModule
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize
 import com.fasterxml.jackson.databind.exc.MismatchedInputException
+import com.fasterxml.jackson.module.kotlin.KotlinFeature
 import com.fasterxml.jackson.module.kotlin.KotlinModule
 import org.apache.commons.collections4.MultiValuedMap
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
+import kotlin.test.assertFailsWith
 
 class TestMultiMapDeserializer {
 
@@ -32,7 +34,16 @@ class TestMultiMapDeserializer {
         private val OBJECT_MAPPER: ObjectMapper = ObjectMapper()
 
         init {
-            OBJECT_MAPPER.registerModule(KotlinModule())
+            OBJECT_MAPPER.registerModule(
+                KotlinModule.Builder()
+                    .withReflectionCacheSize(512)
+                    .configure(KotlinFeature.NullToEmptyCollection, false)
+                    .configure(KotlinFeature.NullToEmptyMap, false)
+                    .configure(KotlinFeature.NullIsSameAsDefault, false)
+                    .configure(KotlinFeature.SingletonSupport, false)
+                    .configure(KotlinFeature.StrictNullChecks, false)
+                    .build()
+            )
 
             OBJECT_MAPPER.registerModule(RoutingStrategyModule(OBJECT_MAPPER))
         }
@@ -40,15 +51,21 @@ class TestMultiMapDeserializer {
 
     @Test
     fun `test negate deserialize`() {
-        try {
-            OBJECT_MAPPER.readValue<TestBeanClass>("""{"multimap":"string"}""", TestBeanClass::class.java)
-            assert(false)
-        } catch (e: MismatchedInputException) {}
+        assertFailsWith(
+            MismatchedInputException::class,
+        ) {
+            OBJECT_MAPPER.readValue("""{"multimap":"string"}""", TestBeanClass::class.java)
+        }.also { e ->
+            assertEquals("""
+                Unexpected token (null), expected START_ARRAY: Can not deserialize MultiValuedMap. Field is not array or object.
+                 at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); line: 1, column: 13] (through reference chain: com.exactpro.th2.common.util.TestMultiMapDeserializer${"$"}TestBeanClass["multimap"])
+            """.trimIndent(), e.message)
+        }
     }
 
     @Test
     fun `test positive deserialize`() {
-        val bean = OBJECT_MAPPER.readValue<TestBeanClass>("""{"multimap":[{"fieldName":"test", "value":"value", "operation":"EQUAL"},{"fieldName":"test", "value":"value123", "operation":"EQUAL"}]}""", TestBeanClass::class.java)
+        val bean = OBJECT_MAPPER.readValue("""{"multimap":[{"fieldName":"test", "value":"value", "operation":"EQUAL"},{"fieldName":"test", "value":"value123", "operation":"EQUAL"}]}""", TestBeanClass::class.java)
 
         val filters = bean.multimap["test"].toList()
 
@@ -57,6 +74,6 @@ class TestMultiMapDeserializer {
         assertEquals(filters[1].expectedValue,"value123")
     }
 
-    private data class TestBeanClass(@JsonDeserialize(using = MultiMapFiltersDeserializer::class)  val multimap: MultiValuedMap<String, FieldFilterConfiguration>) {}
+    private data class TestBeanClass(@JsonDeserialize(using = MultiMapFiltersDeserializer::class)  val multimap: MultiValuedMap<String, FieldFilterConfiguration>)
 
 }
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