diff --git a/build.gradle.kts b/build.gradle.kts
index 4b53335..ccbdad5 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -10,8 +10,8 @@ import org.gradle.api.tasks.testing.logging.TestLogEvent
 
 plugins {
     // Apply the org.jetbrains.kotlin.jvm Plugin to add support for Kotlin.
-    kotlin("jvm") version "1.9.20"
-    kotlin("plugin.serialization") version "1.9.20"
+    kotlin("jvm") version "1.8.0"
+    kotlin("plugin.serialization") version "1.8.0"
 
     // Apply the java-library plugin for API and implementation separation.
     `java-library`
@@ -61,7 +61,7 @@ dependencies {
     // This dependency is used internally, and not exposed to consumers on their own compile classpath.
     implementation("net.swiftzer.semver:semver:1.3.0")
     implementation("com.goncalossilva:murmurhash:0.4.0")
-    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.5.0")
     implementation("com.squareup.okhttp3:okhttp:4.11.0")
     implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3")
 }
diff --git a/src/main/kotlin/com/featurevisor/sdk/Instance+Fetch.kt b/src/main/kotlin/com/featurevisor/sdk/Instance+Fetch.kt
index 2b5e6a0..025fd2c 100644
--- a/src/main/kotlin/com/featurevisor/sdk/Instance+Fetch.kt
+++ b/src/main/kotlin/com/featurevisor/sdk/Instance+Fetch.kt
@@ -1,6 +1,7 @@
 package com.featurevisor.sdk
 
 import com.featurevisor.types.DatafileContent
+import kotlinx.serialization.decodeFromString
 import java.io.IOException
 import okhttp3.*
 import kotlinx.serialization.json.Json
diff --git a/src/main/kotlin/com/featurevisor/sdk/Instance+Variable.kt b/src/main/kotlin/com/featurevisor/sdk/Instance+Variable.kt
index 133eb49..925f20d 100644
--- a/src/main/kotlin/com/featurevisor/sdk/Instance+Variable.kt
+++ b/src/main/kotlin/com/featurevisor/sdk/Instance+Variable.kt
@@ -11,6 +11,7 @@ import com.featurevisor.types.VariableValue.IntValue
 import com.featurevisor.types.VariableValue.JsonValue
 import com.featurevisor.types.VariableValue.ObjectValue
 import com.featurevisor.types.VariableValue.StringValue
+import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.decodeFromJsonElement
 import kotlinx.serialization.json.encodeToJsonElement
diff --git a/src/main/kotlin/com/featurevisor/sdk/Instance.kt b/src/main/kotlin/com/featurevisor/sdk/Instance.kt
index 1977b7c..3a7fb14 100644
--- a/src/main/kotlin/com/featurevisor/sdk/Instance.kt
+++ b/src/main/kotlin/com/featurevisor/sdk/Instance.kt
@@ -17,6 +17,7 @@ import com.featurevisor.types.EventName.UPDATE
 import com.featurevisor.types.Feature
 import com.featurevisor.types.StickyFeatures
 import kotlinx.coroutines.Job
+import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.json.Json
 
 typealias ConfigureBucketKey = (Feature, Context, BucketKey) -> BucketKey
diff --git a/src/main/kotlin/com/featurevisor/sdk/serializers/Serializers.kt b/src/main/kotlin/com/featurevisor/sdk/serializers/Serializers.kt
index 55c9726..04736d3 100644
--- a/src/main/kotlin/com/featurevisor/sdk/serializers/Serializers.kt
+++ b/src/main/kotlin/com/featurevisor/sdk/serializers/Serializers.kt
@@ -14,6 +14,7 @@ import kotlinx.serialization.InternalSerializationApi
 import kotlinx.serialization.KSerializer
 import kotlinx.serialization.SerializationException
 import kotlinx.serialization.Serializer
+import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.descriptors.PolymorphicKind
 import kotlinx.serialization.descriptors.SerialDescriptor
 import kotlinx.serialization.descriptors.buildSerialDescriptor