diff --git a/parsely/build.gradle b/parsely/build.gradle
index 99955460..6c69d623 100644
--- a/parsely/build.gradle
+++ b/parsely/build.gradle
@@ -60,7 +60,7 @@ android {
     }
 
     kotlin {
-        explicitApi(ExplicitApiMode.Warning)
+        explicitApi(ExplicitApiMode.Strict)
     }
 }
 
diff --git a/parsely/src/main/java/com/parsely/parselyandroid/ParselyMetadata.kt b/parsely/src/main/java/com/parsely/parselyandroid/ParselyMetadata.kt
index 8b551587..19eba125 100644
--- a/parsely/src/main/java/com/parsely/parselyandroid/ParselyMetadata.kt
+++ b/parsely/src/main/java/com/parsely/parselyandroid/ParselyMetadata.kt
@@ -11,7 +11,7 @@ import java.util.Calendar
  * internet (i.e. app-only content) or if the customer is using an "in-pixel" integration.
  * Otherwise, metadata will be gathered by Parse.ly's crawling infrastructure.
  */
-open class ParselyMetadata
+public open class ParselyMetadata
 /**
  * Create a new ParselyMetadata object.
  *
@@ -36,7 +36,7 @@ open class ParselyMetadata
      *
      * @return a Map object representing the metadata.
      */
-    open fun toMap(): Map<String, Any?> {
+    internal open fun toMap(): Map<String, Any?> {
         val output: MutableMap<String, Any?> = HashMap()
         if (authors != null) {
             output["authors"] = authors
diff --git a/parsely/src/main/java/com/parsely/parselyandroid/ParselyVideoMetadata.kt b/parsely/src/main/java/com/parsely/parselyandroid/ParselyVideoMetadata.kt
index 36c6381a..0eb55f03 100644
--- a/parsely/src/main/java/com/parsely/parselyandroid/ParselyVideoMetadata.kt
+++ b/parsely/src/main/java/com/parsely/parselyandroid/ParselyVideoMetadata.kt
@@ -5,7 +5,7 @@ import java.util.Calendar
 /**
  * ParselyMetadata for video content.
  */
-class ParselyVideoMetadata
+public class ParselyVideoMetadata
 /**
  * Create a new ParselyVideoMetadata object.
  *