diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 916ea66..4aa5f40 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -6,7 +6,7 @@ plugins {
 android {
     defaultConfig {
         minSdk = 21
-        compileSdk = 33
+        compileSdk = 34
         targetSdk = 34
         applicationId = "com.example.piano_analytics_android"
         versionCode = 1
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index ef5819b..9a0d687 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -10,9 +10,8 @@ moshiIR = "0.22.1"
 
 # AndroidX libraries
 compatLibrary = "1.6.1"
-annotationsLibrary = "1.6.0"
 lifecycle = "2.6.2"
-materialLibrary = "1.9.0"
+materialLibrary = "1.10.0"
 
 # Third party Libraries
 googleAdsId = "18.0.1"
@@ -27,7 +26,7 @@ viewBindingProperty = "1.5.9"
 junit = "4.13.2"
 androidxTestCore = "1.5.0"
 mockitoKotlin = "2.2.0"
-mockitoCore = "5.5.0"
+mockitoCore = "5.6.0"
 
 [plugins]
 android-library = { id = "com.android.library", version.ref = "android" }
@@ -40,7 +39,6 @@ moshiIR = { id = "dev.zacsweers.moshix", version.ref = "moshiIR"}
 versionUpdater = { id = "com.github.ben-manes.versions", version.ref = "versionUpdater" }
 
 [libraries]
-annotations = { module = "androidx.annotation:annotation", version.ref = "annotationsLibrary" }
 appcompat = { module = "androidx.appcompat:appcompat", version.ref = "compatLibrary" }
 lifecycleProcess = { module = "androidx.lifecycle:lifecycle-process", version.ref = "lifecycle"}
 material = { module = "com.google.android.material:material", version.ref = "materialLibrary" }
diff --git a/piano-analytics/build.gradle.kts b/piano-analytics/build.gradle.kts
index f18dd9f..4303d46 100644
--- a/piano-analytics/build.gradle.kts
+++ b/piano-analytics/build.gradle.kts
@@ -18,7 +18,7 @@ version = VERSION_NAME
 android {
     defaultConfig {
         minSdk = 21
-        compileSdk = 33
+        compileSdk = 34
         buildConfigField("String", "SDK_VERSION", """"${project.version}"""")
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
diff --git a/piano-analytics/src/main/java/io/piano/android/analytics/EventPropertiesJsonAdapter.kt b/piano-analytics/src/main/java/io/piano/android/analytics/EventPropertiesJsonAdapter.kt
index 5b19b21..3806c91 100644
--- a/piano-analytics/src/main/java/io/piano/android/analytics/EventPropertiesJsonAdapter.kt
+++ b/piano-analytics/src/main/java/io/piano/android/analytics/EventPropertiesJsonAdapter.kt
@@ -20,7 +20,17 @@ internal class EventPropertiesJsonAdapter(
                 is Double,
                 is Boolean,
                 is Array<*>,
-                -> Property(PropertyName(entry.key), entry.value)
+                -> {
+                    val delimiterIndex = entry.key.lastIndexOf(DELIMITER)
+                    val key = entry.key.substring(delimiterIndex + 1)
+                    val type = if (delimiterIndex != -1) {
+                        val prefix = entry.key.substring(0, delimiterIndex)
+                        Property.Type.values().firstOrNull { it.prefix == prefix }
+                    } else {
+                        null
+                    }
+                    Property(PropertyName(key), entry.value, type)
+                }
 
                 else -> null
             }
@@ -29,6 +39,15 @@ internal class EventPropertiesJsonAdapter(
 
     override fun toJson(writer: JsonWriter, value: Set<Property>?) {
         requireNotNull(value)
-        mapAdapter.toJson(writer, value.associate { it.name.key.lowercase() to it.value })
+        mapAdapter.toJson(
+            writer,
+            value.associate {
+                it.forceType?.prefix?.plus(DELIMITER).orEmpty() + it.name.key.lowercase() to it.value
+            }
+        )
+    }
+
+    companion object {
+        private const val DELIMITER = ":"
     }
 }
diff --git a/piano-analytics/src/main/java/io/piano/android/analytics/model/Property.kt b/piano-analytics/src/main/java/io/piano/android/analytics/model/Property.kt
index 7fba801..07ce45d 100644
--- a/piano-analytics/src/main/java/io/piano/android/analytics/model/Property.kt
+++ b/piano-analytics/src/main/java/io/piano/android/analytics/model/Property.kt
@@ -8,6 +8,7 @@ import java.util.Date
 class Property {
     val name: PropertyName
     val value: Any
+    val forceType: Type?
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
@@ -17,10 +18,11 @@ class Property {
 
     override fun hashCode(): Int = name.key.lowercase().hashCode()
 
-    internal constructor(name: PropertyName, value: Any) {
+    internal constructor(name: PropertyName, value: Any, forceType: Type? = null) {
         require(name != PropertyName.ANY_PROPERTY)
         this.name = name
         this.value = value
+        this.forceType = forceType
     }
 
     /**
@@ -29,10 +31,11 @@ class Property {
      * @param name property name
      * @param value property value
      */
-    constructor(name: PropertyName, value: String) {
+    constructor(name: PropertyName, value: String, forceType: Type? = null) {
         require(name != PropertyName.ANY_PROPERTY)
         this.name = name
         this.value = value
+        this.forceType = forceType
     }
 
     /**
@@ -41,10 +44,11 @@ class Property {
      * @param name property name
      * @param value property value
      */
-    constructor(name: PropertyName, value: Int) {
+    constructor(name: PropertyName, value: Int, forceType: Type? = null) {
         require(name != PropertyName.ANY_PROPERTY)
         this.name = name
         this.value = value
+        this.forceType = forceType
     }
 
     /**
@@ -53,10 +57,11 @@ class Property {
      * @param name property name
      * @param value property value
      */
-    constructor(name: PropertyName, value: Long) {
+    constructor(name: PropertyName, value: Long, forceType: Type? = null) {
         require(name != PropertyName.ANY_PROPERTY)
         this.name = name
         this.value = value
+        this.forceType = forceType
     }
 
     /**
@@ -65,10 +70,11 @@ class Property {
      * @param name property name
      * @param value property value
      */
-    constructor(name: PropertyName, value: Double) {
+    constructor(name: PropertyName, value: Double, forceType: Type? = null) {
         require(name != PropertyName.ANY_PROPERTY)
         this.name = name
         this.value = value
+        this.forceType = forceType
     }
 
     /**
@@ -77,7 +83,7 @@ class Property {
      * @param name property name
      * @param value property value
      */
-    constructor(name: PropertyName, value: Date) : this(name, value.time / 1000)
+    constructor(name: PropertyName, value: Date) : this(name, value.time / 1000, Type.DATE)
 
     /**
      * Creates a new property
@@ -85,10 +91,11 @@ class Property {
      * @param name property name
      * @param value property value
      */
-    constructor(name: PropertyName, value: Boolean) {
+    constructor(name: PropertyName, value: Boolean, forceType: Type? = null) {
         require(name != PropertyName.ANY_PROPERTY)
         this.name = name
         this.value = value
+        this.forceType = forceType
     }
 
     /**
@@ -97,10 +104,11 @@ class Property {
      * @param name property name
      * @param value property value
      */
-    constructor(name: PropertyName, value: Array<String>) {
+    constructor(name: PropertyName, value: Array<String>, forceType: Type? = null) {
         require(name != PropertyName.ANY_PROPERTY)
         this.name = name
         this.value = value
+        this.forceType = forceType
     }
 
     /**
@@ -109,10 +117,11 @@ class Property {
      * @param name property name
      * @param value property value
      */
-    constructor(name: PropertyName, value: Array<Int>) {
+    constructor(name: PropertyName, value: Array<Int>, forceType: Type? = null) {
         require(name != PropertyName.ANY_PROPERTY)
         this.name = name
         this.value = value
+        this.forceType = forceType
     }
 
     /**
@@ -121,9 +130,21 @@ class Property {
      * @param name property name
      * @param value property value
      */
-    constructor(name: PropertyName, value: Array<Double>) {
+    constructor(name: PropertyName, value: Array<Double>, forceType: Type? = null) {
         require(name != PropertyName.ANY_PROPERTY)
         this.name = name
         this.value = value
+        this.forceType = forceType
+    }
+
+    enum class Type(val prefix: String) {
+        STRING("s"),
+        INTEGER("n"),
+        FLOAT("f"),
+        DATE("d"),
+        BOOLEAN("b"),
+        STRING_ARRAY("a:s"),
+        INTEGER_ARRAY("a:n"),
+        FLOAT_ARRAY("a:f"),
     }
 }