diff --git a/main/src/main/java/org/mobilitydata/gtfsvalidator/util/VersionResolver.java b/main/src/main/java/org/mobilitydata/gtfsvalidator/util/VersionResolver.java
index b9af1135c0..1e33fd3d0a 100644
--- a/main/src/main/java/org/mobilitydata/gtfsvalidator/util/VersionResolver.java
+++ b/main/src/main/java/org/mobilitydata/gtfsvalidator/util/VersionResolver.java
@@ -163,7 +163,7 @@ private Optional<String> resolveLatestReleaseVersion(Optional<String> currentVer
   }
 
   /** Serialization object for parsing the /version API response. */
-  class VersionResponse {
+  public static class VersionResponse {
     String version;
   }
 }