diff --git a/build.gradle.kts b/build.gradle.kts
index b5d3485c..d4c6eab3 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -18,7 +18,7 @@ val jacksonVersion = libs.versions.jackson.get()
 val generatedSrcPath = "${layout.buildDirectory.get()}/generated/kotlin"
 
 group = groupStr
-version = "${jacksonVersion}-beta32"
+version = "${jacksonVersion}-beta33"
 
 repositories {
     mavenCentral()
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index aef030fd..6abf9f63 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,9 +1,9 @@
 [versions]
 kotlin = "2.1.21" # Mainly for CI, it can be rewritten by environment variable.
-jackson = "2.20.1"
+jackson = "2.20.2"
 
 # test libs
-junit = "5.14.1"
+junit = "5.14.3"
 
 [libraries]
 kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib" }
@@ -16,7 +16,7 @@ jackson-annotations = { module = "com.fasterxml.jackson.core:jackson-annotations
 # test libs
 kotlin-reflect = { module = "org.jetbrains.kotlin:kotlin-reflect" }
 junit-bom = { module = "org.junit:junit-bom", version.ref = "junit" }
-mockk = "io.mockk:mockk:1.14.6"
+mockk = "io.mockk:mockk:1.14.9"
 jackson-xml = { module = "com.fasterxml.jackson.dataformat:jackson-dataformat-xml" }
 jackson-csv = { module = "com.fasterxml.jackson.dataformat:jackson-dataformat-csv" }
 jackson-jsr310 = { module = "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" }
diff --git a/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/Extensions.kt b/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/Extensions.kt
index e64a50f5..08286c7f 100644
--- a/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/Extensions.kt
+++ b/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/Extensions.kt
@@ -11,6 +11,7 @@ import com.fasterxml.jackson.databind.Module
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.databind.ObjectReader
 import com.fasterxml.jackson.databind.RuntimeJsonMappingException
+import com.fasterxml.jackson.databind.cfg.MapperBuilder
 import com.fasterxml.jackson.databind.cfg.MutableConfigOverride
 import com.fasterxml.jackson.databind.json.JsonMapper
 import com.fasterxml.jackson.databind.module.SimpleModule
@@ -200,6 +201,7 @@ public inline fun <reified T, reified U> JsonMapper.Builder.addMixIn(): JsonMapp
     T::class.java,
     U::class.java,
 )
+public inline fun <M : MapperBuilder<*, M>, reified T, reified U> M.addMixIn(): M = this.addMixIn(T::class.java, U::class.java)
 
 public operator fun ArrayNode.plus(element: Boolean) {
     add(element)
diff --git a/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinClassIntrospector.kt b/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinClassIntrospector.kt
index ae4e3f9f..53f39447 100644
--- a/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinClassIntrospector.kt
+++ b/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinClassIntrospector.kt
@@ -37,6 +37,8 @@ internal class KotlinBeanDescription(coll: POJOPropertiesCollector) : BasicBeanD
 internal object KotlinClassIntrospector : BasicClassIntrospector() {
     private fun readResolve(): Any = KotlinClassIntrospector
 
+    override fun copy(): KotlinClassIntrospector = this
+
     override fun forSerialization(
         config: SerializationConfig,
         type: JavaType,
diff --git a/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/zPorted/test/ExtensionMethodsTests.kt b/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/zPorted/test/ExtensionMethodsTests.kt
index 35adb65f..d933d614 100644
--- a/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/zPorted/test/ExtensionMethodsTests.kt
+++ b/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/zPorted/test/ExtensionMethodsTests.kt
@@ -5,6 +5,7 @@ import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.databind.SerializationFeature
 import com.fasterxml.jackson.databind.json.JsonMapper
 import com.fasterxml.jackson.databind.node.JsonNodeFactory
+import com.fasterxml.jackson.dataformat.csv.CsvMapper
 import io.github.projectmapk.jackson.module.kogera.addMixIn
 import io.github.projectmapk.jackson.module.kogera.contains
 import io.github.projectmapk.jackson.module.kogera.convertValue
@@ -101,4 +102,17 @@ private class TestExtensionMethods {
 
         assertEquals("{}", serializedPerson)
     }
+
+    @Test fun mixInExtensionForGenericMapperBuilderTest() {
+        data class Person(val name: String)
+        abstract class PersonMixIn { @JsonIgnore var name: String = "" }
+
+        // Assigned to a temporary variable to ensure that addMixIn returns a builder with the proper type
+        val mapperBuilder: CsvMapper.Builder = CsvMapper.builder()
+            .addMixIn<_, Person, PersonMixIn>()
+        val mapper: CsvMapper = mapperBuilder.build()
+        val serializedPerson: String = mapper.writeValueAsString(Person("test"))
+
+        assertEquals("", serializedPerson)
+    }
 }