diff --git a/firebase-vertexai/CHANGELOG.md b/firebase-vertexai/CHANGELOG.md
index 319676102e5..b519e167307 100644
--- a/firebase-vertexai/CHANGELOG.md
+++ b/firebase-vertexai/CHANGELOG.md
@@ -1,5 +1,6 @@
 # Unreleased
 * [feature] added support for `responseSchema` in `GenerationConfig`.
+* [changed] Made `FunctionCallPart.args` nullable.
 
 # 16.0.0-beta03
 * [changed] Breaking Change: changed `Schema.int` to return 32 bit integers instead of 64 bit (long).
diff --git a/firebase-vertexai/firebase-vertexai.gradle.kts b/firebase-vertexai/firebase-vertexai.gradle.kts
index 01f46b60a5b..fcef66e1d6a 100644
--- a/firebase-vertexai/firebase-vertexai.gradle.kts
+++ b/firebase-vertexai/firebase-vertexai.gradle.kts
@@ -61,7 +61,7 @@ dependencies {
   implementation("com.google.firebase:firebase-components:18.0.0")
   implementation("com.google.firebase:firebase-annotations:16.2.0")
   implementation("com.google.firebase:firebase-appcheck-interop:17.1.0")
-  implementation("com.google.ai.client.generativeai:common:0.9.0")
+  implementation("com.google.ai.client.generativeai:common:0.10.0")
   implementation(libs.androidx.annotation)
   implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.5.1")
   implementation("androidx.core:core-ktx:1.12.0")
diff --git a/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/internal/util/conversions.kt b/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/internal/util/conversions.kt
index f6f77b42142..7d992962451 100644
--- a/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/internal/util/conversions.kt
+++ b/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/internal/util/conversions.kt
@@ -86,7 +86,7 @@ internal fun Part.toInternal(): com.google.ai.client.generativeai.common.shared.
         )
       )
     is com.google.firebase.vertexai.type.FunctionCallPart ->
-      FunctionCallPart(FunctionCall(name, args.orEmpty()))
+      FunctionCallPart(FunctionCall(name, args))
     is com.google.firebase.vertexai.type.FunctionResponsePart ->
       FunctionResponsePart(FunctionResponse(name, response.toInternal()))
     is FileDataPart ->
@@ -220,7 +220,7 @@ internal fun com.google.ai.client.generativeai.common.shared.Part.toPublic(): Pa
     is FunctionCallPart ->
       com.google.firebase.vertexai.type.FunctionCallPart(
         functionCall.name,
-        functionCall.args.orEmpty(),
+        functionCall.args,
       )
     is FunctionResponsePart ->
       com.google.firebase.vertexai.type.FunctionResponsePart(
diff --git a/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/FunctionDeclarations.kt b/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/FunctionDeclarations.kt
index 3d836bad27b..7a57d508f4a 100644
--- a/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/FunctionDeclarations.kt
+++ b/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/FunctionDeclarations.kt
@@ -368,7 +368,7 @@ fun <T, U, W, Z> defineFunction(
 ) = FourParameterFunction(name, description, arg1, arg2, arg3, arg4, function)
 
 private fun <T> FunctionCallPart.getArgOrThrow(param: Schema<T>): T {
-  return param.fromString(args[param.name])
+  return param.fromString(args?.get(param.name))
     ?: throw RuntimeException(
       "Missing argument for parameter \"${param.name}\" for function \"$name\""
     )
diff --git a/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/Part.kt b/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/Part.kt
index 60b31b98a7a..61827e159b7 100644
--- a/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/Part.kt
+++ b/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/Part.kt
@@ -49,7 +49,7 @@ class BlobPart(val mimeType: String, val blob: ByteArray) : Part
  * @param name the name of the function to call
  * @param args the function parameters and values as a [Map]
  */
-class FunctionCallPart(val name: String, val args: Map<String, String?>) : Part
+class FunctionCallPart(val name: String, val args: Map<String, String?>?) : Part
 
 /**
  * Represents function call output to be returned to the model when it requests a function call.
diff --git a/firebase-vertexai/src/test/java/com/google/firebase/vertexai/UnarySnapshotTests.kt b/firebase-vertexai/src/test/java/com/google/firebase/vertexai/UnarySnapshotTests.kt
index eeb45bba43e..c4c2d4a8dda 100644
--- a/firebase-vertexai/src/test/java/com/google/firebase/vertexai/UnarySnapshotTests.kt
+++ b/firebase-vertexai/src/test/java/com/google/firebase/vertexai/UnarySnapshotTests.kt
@@ -335,7 +335,8 @@ internal class UnarySnapshotTests {
         val response = model.generateContent("prompt")
         val callPart = (response.candidates.first().content.parts.first() as FunctionCallPart)
 
-        callPart.args["season"] shouldBe null
+        callPart.args shouldNotBe null
+        callPart.args?.get("seasons") shouldBe null
       }
     }
 
@@ -352,7 +353,19 @@ internal class UnarySnapshotTests {
             it.parts.first().shouldBeInstanceOf<FunctionCallPart>()
           }
 
-        callPart.args["current"] shouldBe "true"
+        callPart.args?.get("current") shouldBe "true"
+      }
+    }
+
+  @Test
+  fun `function call has no arguments field`() =
+    goldenUnaryFile("unary-success-function-call-empty-arguments.json") {
+      withTimeout(testTimeout) {
+        val response = model.generateContent("prompt")
+        val callPart = response.functionCalls.first()
+
+        callPart.name shouldBe "current_time"
+        callPart.args shouldBe null
       }
     }
 
@@ -364,7 +377,7 @@ internal class UnarySnapshotTests {
         val callPart = response.functionCalls.shouldNotBeEmpty().first()
 
         callPart.name shouldBe "current_time"
-        callPart.args.isEmpty() shouldBe true
+        callPart.args?.isEmpty() shouldBe true
       }
     }
 
@@ -376,8 +389,8 @@ internal class UnarySnapshotTests {
         val callPart = response.functionCalls.shouldNotBeEmpty().first()
 
         callPart.name shouldBe "sum"
-        callPart.args["x"] shouldBe "4"
-        callPart.args["y"] shouldBe "5"
+        callPart.args?.get("x") shouldBe "4"
+        callPart.args?.get("y") shouldBe "5"
       }
     }
 
@@ -391,7 +404,7 @@ internal class UnarySnapshotTests {
         callList.size shouldBe 3
         callList.forEach {
           it.name shouldBe "sum"
-          it.args.size shouldBe 2
+          it.args?.size shouldBe 2
         }
       }
     }
@@ -405,7 +418,7 @@ internal class UnarySnapshotTests {
 
         response.text shouldBe "The sum of [1, 2, 3] is"
         callList.size shouldBe 2
-        callList.forEach { it.args.size shouldBe 2 }
+        callList.forEach { it.args?.size shouldBe 2 }
       }
     }