diff --git a/benchmark/build.gradle.kts b/benchmark/build.gradle.kts
index 8f140925b26..cf4a29178e9 100644
--- a/benchmark/build.gradle.kts
+++ b/benchmark/build.gradle.kts
@@ -21,6 +21,7 @@ import flavor.ProductFlavors
 plugins {
     id("com.android.test")
     alias(libs.plugins.androidx.baselineprofile)
+    alias(libs.plugins.kotlin.serialization)
 }
 
 android {
@@ -81,7 +82,7 @@ dependencies {
     implementation(libs.androidx.test.uiAutomator)
     implementation(libs.androidx.benchmark.macro.junit4)
     implementation(libs.datafaker)
-    implementation(libs.gson)
+    implementation(libs.ktx.serialization)
     implementation(libs.junit4)
     implementation(libs.zxing.android.embedded)
     implementation(libs.zxing.core)
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 25522fc91ce..c8a29788dda 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -116,7 +116,6 @@ hamcrest = "3.0"
 rules = "1.7.0"
 zxing = "3.5.2"
 zxingAndroid = "4.3.0"
-gson = "2.13.2"
 allureKotlin = "2.4.0"
 androidx-test-services = "1.6.0"
 
@@ -305,7 +304,6 @@ androidx-test-work = { module = "androidx.work:work-testing", version.ref = "and
 androidx-benchmark-macro-junit4 = { group = "androidx.benchmark", name = "benchmark-macro-junit4", version.ref = "benchmark-macro-junit4" }
 zxing-core = { module = "com.google.zxing:core", version.ref = "zxing" }
 zxing-android-embedded = { module = "com.journeyapps:zxing-android-embedded", version.ref = "zxingAndroid" }
-gson = { module = "com.google.code.gson:gson", version.ref = "gson" }
 
 # Test
 androidx-espresso-accessibility = { module = "androidx.test.espresso:espresso-accessibility", version.ref = "androidx-espresso" }
diff --git a/tests/testsCore/build.gradle.kts b/tests/testsCore/build.gradle.kts
index 406f6af537e..de228a44fad 100644
--- a/tests/testsCore/build.gradle.kts
+++ b/tests/testsCore/build.gradle.kts
@@ -1,5 +1,6 @@
 plugins {
     id(libs.plugins.wire.android.test.library.get().pluginId)
+    alias(libs.plugins.kotlin.serialization)
     id(libs.plugins.wire.compose.compiler.get().pluginId)
 }
 
@@ -36,7 +37,7 @@ dependencies {
     implementation(libs.datafaker)
     androidTestImplementation(libs.zxing.core)
     androidTestImplementation(libs.zxing.android.embedded)
-    androidTestImplementation(libs.gson)
+    androidTestImplementation(libs.ktx.serialization)
     androidTestImplementation(libs.allure.kotlin.android)
     androidTestUtil(libs.androidx.test.orchestrator)
     androidTestUtil(libs.androidx.test.services)
diff --git a/tests/testsSupport/build.gradle.kts b/tests/testsSupport/build.gradle.kts
index 1bc38c3f157..ff825cdb44f 100644
--- a/tests/testsSupport/build.gradle.kts
+++ b/tests/testsSupport/build.gradle.kts
@@ -5,6 +5,7 @@ import java.util.Properties
 // Apply your test library plugin
 plugins {
     id(libs.plugins.wire.android.test.library.get().pluginId)
+    alias(libs.plugins.kotlin.serialization)
     id(libs.plugins.wire.compose.compiler.get().pluginId)
 }
 
@@ -83,7 +84,7 @@ dependencies {
     androidTestImplementation(libs.androidx.espresso.core)
     androidTestImplementation(libs.androidx.test.uiAutomator)
     implementation(libs.datafaker)
-    androidTestImplementation(libs.gson)
+    implementation(libs.ktx.serialization)
 }
 
 // Register a custom Gradle task 'fetchSecrets' to fetch secrets from 1Password CLI and generate secrets.json
diff --git a/tests/testsSupport/src/main/call/CallingService.kt b/tests/testsSupport/src/main/call/CallingService.kt
index 77c40a83d4d..71a67f93c49 100644
--- a/tests/testsSupport/src/main/call/CallingService.kt
+++ b/tests/testsSupport/src/main/call/CallingService.kt
@@ -17,9 +17,11 @@ import call.models.CallFlow
 import call.models.CallRequest
 import call.models.Instance
 import call.models.InstanceRequest
-import com.google.gson.Gson
-import com.google.gson.reflect.TypeToken
 import com.wire.android.testSupport.BuildConfig
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
 import network.HttpRequestException
 import java.io.IOException
 import java.net.HttpCookie
@@ -37,7 +39,13 @@ class CallingService(
     val applicationJson = "application/json"
     val contentTypeString = "Content-Type"
 
-    private val gson = Gson()
+    @OptIn(ExperimentalSerializationApi::class)
+    private val json = Json {
+        coerceInputValues = true
+        encodeDefaults = true
+        explicitNulls = false
+        ignoreUnknownKeys = true
+    }
     private val cookies = ConcurrentHashMap<String, HttpCookie>()
     private var basicAuthUser: String? = null
     private var basicAuthPassword: String? = null
@@ -100,8 +108,8 @@ class CallingService(
             conn.setRequestProperty(contentTypeString, applicationJson)
             conn.setRequestProperty("Accept", applicationJson)
 
-            val response = httpPost(conn, gson.toJson(request), intArrayOf(HttpURLConnection.HTTP_OK))
-            val instance = gson.fromJson(response, Instance::class.java)
+            val response = httpPost(conn, json.encodeToString(request), intArrayOf(HttpURLConnection.HTTP_OK))
+            val instance = json.decodeFromString<Instance>(response)
 
             conn.getHeaderField("Set-Cookie")?.let { cookieHeader ->
                 HttpCookie.parse(cookieHeader)
@@ -120,7 +128,7 @@ class CallingService(
         return try {
             val response = httpPut(conn, "", intArrayOf(HttpURLConnection.HTTP_OK))
             cookies.remove(instance.id)
-            gson.fromJson(response, Instance::class.java)
+            json.decodeFromString<Instance>(response)
         } catch (ex: Exception) {
             throw HttpRequestException("destroyInstance failed: ${ex.message}", 500)
         }
@@ -131,7 +139,7 @@ class CallingService(
         val conn = buildRequestForInstance(instance.id, target)
         return try {
             val response = httpGet(conn, intArrayOf(HttpURLConnection.HTTP_OK))
-            gson.fromJson(response, Instance::class.java)
+            json.decodeFromString<Instance>(response)
         } catch (ex: Exception) {
             throw HttpRequestException("getInstance failed: ${ex.message}", 500)
         }
@@ -142,8 +150,7 @@ class CallingService(
         val conn = buildRequestForInstance(instance.id, target)
         return try {
             val response = httpGet(conn, intArrayOf(HttpURLConnection.HTTP_OK))
-            val type = object : TypeToken<List<CallFlow>>() {}.type
-            gson.fromJson(response, type)
+            json.decodeFromString<List<CallFlow>>(response)
         } catch (ex: Exception) {
             throw HttpRequestException("getFlows failed: ${ex.message}", 500)
         }
@@ -190,8 +197,7 @@ class CallingService(
             val conn = buildRequestForCertainInstance(serverId, target)
             try {
                 val response = httpGet(conn, intArrayOf(HttpURLConnection.HTTP_OK))
-                val type = object : TypeToken<List<Instance>>() {}.type
-                val serverInstances: List<Instance> = gson.fromJson(response, type)
+                val serverInstances = json.decodeFromString<List<Instance>>(response)
                 serverInstances.forEach {
                     if (!cookies.containsKey(it.id)) {
                         cookies[it.id!!] = HttpCookie("SERVERID", serverId)
@@ -273,22 +279,22 @@ class CallingService(
 
     // region CALL HELPERS
 
-    private fun performCall(instance: Instance, path: String, request: Any): Call {
+    private fun performCall(instance: Instance, path: String, request: CallRequest): Call {
         val conn = buildRequestForInstance(instance.id, "/api/v1/instance/${instance.id}$path")
-        val response = httpPost(conn, gson.toJson(request), intArrayOf(HttpURLConnection.HTTP_OK))
-        return gson.fromJson(response, Call::class.java)
+        val response = httpPost(conn, json.encodeToString(request), intArrayOf(HttpURLConnection.HTTP_OK))
+        return json.decodeFromString<Call>(response)
     }
 
     private fun performCallPut(instance: Instance, path: String): Call {
         val conn = buildRequestForInstance(instance.id, "/api/v1/instance/${instance.id}$path")
         val response = httpPut(conn, "", intArrayOf(HttpURLConnection.HTTP_OK))
-        return gson.fromJson(response, Call::class.java)
+        return json.decodeFromString<Call>(response)
     }
 
     private fun performCallGet(instance: Instance, path: String): Call {
         val conn = buildRequestForInstance(instance.id, "/api/v1/instance/${instance.id}$path")
         val response = httpGet(conn, intArrayOf(HttpURLConnection.HTTP_OK))
-        return gson.fromJson(response, Call::class.java)
+        return json.decodeFromString<Call>(response)
     }
 
     // endregion
diff --git a/tests/testsSupport/src/main/call/models/BackendDTO.kt b/tests/testsSupport/src/main/call/models/BackendDTO.kt
index 4d4c32e5a65..4f3331af79a 100644
--- a/tests/testsSupport/src/main/call/models/BackendDTO.kt
+++ b/tests/testsSupport/src/main/call/models/BackendDTO.kt
@@ -18,7 +18,9 @@
 package call.models
 
 import backendUtils.BackendClient
+import kotlinx.serialization.Serializable
 
+@Serializable
 data class BackendDTO(
     var name: String,
     val webappUrl: String,
diff --git a/tests/testsSupport/src/main/call/models/Call.kt b/tests/testsSupport/src/main/call/models/Call.kt
index d194fb5f9a2..038c7534c52 100644
--- a/tests/testsSupport/src/main/call/models/Call.kt
+++ b/tests/testsSupport/src/main/call/models/Call.kt
@@ -17,6 +17,9 @@
  */
 package call.models
 
+import kotlinx.serialization.Serializable
+
+@Serializable
 data class Call(
     var id: String? = null,
     var status: CallStatus? = null,
diff --git a/tests/testsSupport/src/main/call/models/CallFlow.kt b/tests/testsSupport/src/main/call/models/CallFlow.kt
index 06f5849e4c1..5de650d6dc4 100644
--- a/tests/testsSupport/src/main/call/models/CallFlow.kt
+++ b/tests/testsSupport/src/main/call/models/CallFlow.kt
@@ -17,22 +17,24 @@
  */
 package call.models
 
-import com.google.gson.annotations.SerializedName
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
 
+@Serializable
 data class CallFlow(
-    @SerializedName("audioPacketsReceived")
+    @SerialName("audioPacketsReceived")
     val audioPacketsReceived: Long,
 
-    @SerializedName("audioPacketsSent")
+    @SerialName("audioPacketsSent")
     val audioPacketsSent: Long,
 
-    @SerializedName("videoPacketsReceived")
+    @SerialName("videoPacketsReceived")
     val videoPacketsReceived: Long,
 
-    @SerializedName("videoPacketsSent")
+    @SerialName("videoPacketsSent")
     val videoPacketsSent: Long,
 
-    @SerializedName("remoteUserId")
+    @SerialName("remoteUserId")
     val remoteUserId: String
 ) {
 
diff --git a/tests/testsSupport/src/main/call/models/CallRequest.kt b/tests/testsSupport/src/main/call/models/CallRequest.kt
index 4bfc26f62b8..8c8a7c14fca 100644
--- a/tests/testsSupport/src/main/call/models/CallRequest.kt
+++ b/tests/testsSupport/src/main/call/models/CallRequest.kt
@@ -17,13 +17,15 @@
  */
 package call.models
 
-import com.google.gson.annotations.SerializedName
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
 
+@Serializable
 data class CallRequest(
-    @SerializedName("conversationId")
+    @SerialName("conversationId")
     val conversationId: String = "",
 
-    @SerializedName("timeout")
+    @SerialName("timeout")
     val timeout: Long = DEFAULT_CALL_TIMEOUT
 ) {
     companion object {
diff --git a/tests/testsSupport/src/main/call/models/CallStatus.kt b/tests/testsSupport/src/main/call/models/CallStatus.kt
index 3b05fb88d1d..09999d78e7e 100644
--- a/tests/testsSupport/src/main/call/models/CallStatus.kt
+++ b/tests/testsSupport/src/main/call/models/CallStatus.kt
@@ -17,6 +17,9 @@
  */
 package call.models
 
+import kotlinx.serialization.Serializable
+
+@Serializable
 enum class CallStatus {
     NON_EXISTENT,
     WAITING,
diff --git a/tests/testsSupport/src/main/call/models/Instance.kt b/tests/testsSupport/src/main/call/models/Instance.kt
index e70d45c713e..27a808dfcb7 100644
--- a/tests/testsSupport/src/main/call/models/Instance.kt
+++ b/tests/testsSupport/src/main/call/models/Instance.kt
@@ -17,6 +17,9 @@
  */
 package call.models
 
+import kotlinx.serialization.Serializable
+
+@Serializable
 data class Instance(
     val id: String?,
     val instanceStatus: InstanceStatus?,
diff --git a/tests/testsSupport/src/main/call/models/InstanceRequest.kt b/tests/testsSupport/src/main/call/models/InstanceRequest.kt
index edc1ce0aa62..7025656f9b3 100644
--- a/tests/testsSupport/src/main/call/models/InstanceRequest.kt
+++ b/tests/testsSupport/src/main/call/models/InstanceRequest.kt
@@ -17,6 +17,9 @@
  */
 package call.models
 
+import kotlinx.serialization.Serializable
+
+@Serializable
 data class InstanceRequest(
     val email: String,
     val password: String,
diff --git a/tests/testsSupport/src/main/call/models/InstanceStatus.kt b/tests/testsSupport/src/main/call/models/InstanceStatus.kt
index d969957bb74..ffeb56ad30c 100644
--- a/tests/testsSupport/src/main/call/models/InstanceStatus.kt
+++ b/tests/testsSupport/src/main/call/models/InstanceStatus.kt
@@ -18,6 +18,9 @@
 
 package call.models
 
+import kotlinx.serialization.Serializable
+
+@Serializable
 enum class InstanceStatus {
     NON_EXISTENT,
     STARTING,
diff --git a/tests/testsSupport/src/main/call/models/Metrics.kt b/tests/testsSupport/src/main/call/models/Metrics.kt
index 790612af581..e907dbef2fa 100644
--- a/tests/testsSupport/src/main/call/models/Metrics.kt
+++ b/tests/testsSupport/src/main/call/models/Metrics.kt
@@ -20,6 +20,9 @@
 )
 package call.models
 
+import kotlinx.serialization.Serializable
+
+@Serializable
 data class Metrics(
     val success: Boolean,
     val estabTimeMs: Long,
diff --git a/tests/testsSupport/src/main/call/models/VersionedInstanceType.kt b/tests/testsSupport/src/main/call/models/VersionedInstanceType.kt
index fcdb9f403c3..1e23f59e9de 100644
--- a/tests/testsSupport/src/main/call/models/VersionedInstanceType.kt
+++ b/tests/testsSupport/src/main/call/models/VersionedInstanceType.kt
@@ -17,6 +17,9 @@
  */
 package call.models
 
+import kotlinx.serialization.Serializable
+
+@Serializable
 data class VersionedInstanceType(
     val name: String,
     val version: String