diff --git a/firebase-vertexai/consumer-rules.pro b/firebase-vertexai/consumer-rules.pro
new file mode 100644
index 00000000000..7947f53cd58
--- /dev/null
+++ b/firebase-vertexai/consumer-rules.pro
@@ -0,0 +1,23 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
+
+-keep class com.google.firebase.vertexai.common.** { *; }
diff --git a/firebase-vertexai/firebase-vertexai.gradle.kts b/firebase-vertexai/firebase-vertexai.gradle.kts
index 59306df92a9..9bdabd0f0ce 100644
--- a/firebase-vertexai/firebase-vertexai.gradle.kts
+++ b/firebase-vertexai/firebase-vertexai.gradle.kts
@@ -42,9 +42,19 @@ android {
   defaultConfig {
     minSdk = 21
     targetSdk = 34
+    consumerProguardFiles("consumer-rules.pro")
     multiDexEnabled = true
     testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
   }
+  buildTypes {
+    release {
+      isMinifyEnabled = false
+      proguardFiles(
+        getDefaultProguardFile("proguard-android-optimize.txt"),
+        "proguard-rules.pro"
+      )
+    }
+  }
   compileOptions {
     sourceCompatibility = JavaVersion.VERSION_1_8
     targetCompatibility = JavaVersion.VERSION_1_8
diff --git a/firebase-vertexai/proguard-rules.pro b/firebase-vertexai/proguard-rules.pro
new file mode 100644
index 00000000000..f1b424510da
--- /dev/null
+++ b/firebase-vertexai/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
diff --git a/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/common/APIController.kt b/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/common/APIController.kt
index f81fa0fc99a..bee23d52613 100644
--- a/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/common/APIController.kt
+++ b/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/common/APIController.kt
@@ -17,7 +17,6 @@
 package com.google.firebase.vertexai.common
 
 import android.util.Log
-import androidx.annotation.VisibleForTesting
 import com.google.firebase.vertexai.common.server.FinishReason
 import com.google.firebase.vertexai.common.util.decodeToFlow
 import com.google.firebase.vertexai.common.util.fullModelName
@@ -25,8 +24,6 @@ import com.google.firebase.vertexai.type.RequestOptions
 import io.ktor.client.HttpClient
 import io.ktor.client.call.body
 import io.ktor.client.engine.HttpClientEngine
-import io.ktor.client.engine.mock.MockEngine
-import io.ktor.client.engine.mock.respond
 import io.ktor.client.engine.okhttp.OkHttp
 import io.ktor.client.plugins.HttpTimeout
 import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
@@ -39,12 +36,9 @@ import io.ktor.client.statement.HttpResponse
 import io.ktor.client.statement.bodyAsChannel
 import io.ktor.client.statement.bodyAsText
 import io.ktor.http.ContentType
-import io.ktor.http.HttpHeaders
 import io.ktor.http.HttpStatusCode
 import io.ktor.http.contentType
-import io.ktor.http.headersOf
 import io.ktor.serialization.kotlinx.json.json
-import io.ktor.utils.io.ByteChannel
 import kotlin.math.max
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.seconds
@@ -94,24 +88,6 @@ internal constructor(
     headerProvider: HeaderProvider? = null,
   ) : this(key, model, requestOptions, OkHttp.create(), apiClient, headerProvider)
 
-  @VisibleForTesting(otherwise = VisibleForTesting.NONE)
-  constructor(
-    key: String,
-    model: String,
-    requestOptions: RequestOptions,
-    apiClient: String,
-    headerProvider: HeaderProvider?,
-    channel: ByteChannel,
-    status: HttpStatusCode,
-  ) : this(
-    key,
-    model,
-    requestOptions,
-    MockEngine { respond(channel, status, headersOf(HttpHeaders.ContentType, "application/json")) },
-    apiClient,
-    headerProvider,
-  )
-
   private val model = fullModelName(model)
 
   private val client =
diff --git a/firebase-vertexai/src/test/java/com/google/firebase/vertexai/common/util/tests.kt b/firebase-vertexai/src/test/java/com/google/firebase/vertexai/common/util/tests.kt
index 8a7184e9851..db42d791c30 100644
--- a/firebase-vertexai/src/test/java/com/google/firebase/vertexai/common/util/tests.kt
+++ b/firebase-vertexai/src/test/java/com/google/firebase/vertexai/common/util/tests.kt
@@ -28,7 +28,11 @@ import com.google.firebase.vertexai.common.shared.TextPart
 import com.google.firebase.vertexai.type.RequestOptions
 import io.kotest.matchers.collections.shouldNotBeEmpty
 import io.kotest.matchers.nulls.shouldNotBeNull
+import io.ktor.client.engine.mock.MockEngine
+import io.ktor.client.engine.mock.respond
+import io.ktor.http.HttpHeaders
 import io.ktor.http.HttpStatusCode
+import io.ktor.http.headersOf
 import io.ktor.utils.io.ByteChannel
 import io.ktor.utils.io.close
 import io.ktor.utils.io.writeFully
@@ -106,10 +110,11 @@ internal fun commonTest(
       "super_cool_test_key",
       "gemini-pro",
       requestOptions,
+      MockEngine {
+        respond(channel, status, headersOf(HttpHeaders.ContentType, "application/json"))
+      },
       TEST_CLIENT_ID,
       null,
-      channel,
-      status,
     )
   CommonTestScope(channel, apiController).block()
 }
diff --git a/firebase-vertexai/src/test/java/com/google/firebase/vertexai/util/tests.kt b/firebase-vertexai/src/test/java/com/google/firebase/vertexai/util/tests.kt
index 7afb202c1d6..29b7923e35b 100644
--- a/firebase-vertexai/src/test/java/com/google/firebase/vertexai/util/tests.kt
+++ b/firebase-vertexai/src/test/java/com/google/firebase/vertexai/util/tests.kt
@@ -21,7 +21,11 @@ import com.google.firebase.vertexai.common.APIController
 import com.google.firebase.vertexai.type.RequestOptions
 import io.kotest.matchers.collections.shouldNotBeEmpty
 import io.kotest.matchers.nulls.shouldNotBeNull
+import io.ktor.client.engine.mock.MockEngine
+import io.ktor.client.engine.mock.respond
+import io.ktor.http.HttpHeaders
 import io.ktor.http.HttpStatusCode
+import io.ktor.http.headersOf
 import io.ktor.utils.io.ByteChannel
 import io.ktor.utils.io.close
 import io.ktor.utils.io.writeFully
@@ -93,10 +97,11 @@ internal fun commonTest(
       "super_cool_test_key",
       "gemini-pro",
       requestOptions,
+      MockEngine {
+        respond(channel, status, headersOf(HttpHeaders.ContentType, "application/json"))
+      },
       TEST_CLIENT_ID,
       null,
-      channel,
-      status,
     )
   val model = GenerativeModel("cool-model-name", controller = apiController)
   CommonTestScope(channel, model).block()