diff --git a/Periodic_3_mesh_3/package_info/Periodic_3_mesh_3/dependencies b/Periodic_3_mesh_3/package_info/Periodic_3_mesh_3/dependencies
index 9046a3843f9..ebd0dab4c10 100644
--- a/Periodic_3_mesh_3/package_info/Periodic_3_mesh_3/dependencies
+++ b/Periodic_3_mesh_3/package_info/Periodic_3_mesh_3/dependencies
@@ -24,6 +24,7 @@ Number_types
 Periodic_3_mesh_3
 Periodic_3_triangulation_3
 Polygon
+Polygon_mesh_processing
 Principal_component_analysis
 Principal_component_analysis_LGPL
 Profiling_tools
@@ -35,3 +36,5 @@ Spatial_sorting
 Stream_support
 TDS_3
 Triangulation_3
+Union_find
+