diff --git a/Project.toml b/Project.toml
index eb4806a..b43e571 100644
--- a/Project.toml
+++ b/Project.toml
@@ -18,6 +18,7 @@ JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
 Logging = "56ddb016-857b-54e1-b83d-db4d58db5568"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 Pluto = "c3e4b0f8-55cb-11ea-2926-15256bba5781"
+PlutoDependencyExplorer = "72656b73-756c-7461-726b-72656b6b696b"
 SHA = "ea8e919c-243c-51af-8825-aaa63cd721ce"
 Sockets = "6462fe0b-24de-5631-8697-dd941f90decc"
 TOML = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
@@ -38,7 +39,8 @@ HTTP = "^1.0.2"
 JSON = "0.21"
 Logging = "1"
 Pkg = "1"
-Pluto = "0.19.18"
+Pluto = "0.19.39"
+PlutoDependencyExplorer = "1"
 SHA = "0.7, 1"
 Sockets = "1"
 TOML = "1"
diff --git a/src/MoreAnalysis.jl b/src/MoreAnalysis.jl
index 48762de..2a211bf 100644
--- a/src/MoreAnalysis.jl
+++ b/src/MoreAnalysis.jl
@@ -1,5 +1,6 @@
 import Pluto
 import Pluto: Cell, Notebook, NotebookTopology, ExpressionExplorer, ServerSession
+import PlutoDependencyExplorer
 
 
 "Return the given cells, and all cells that depend on them (recursively)."
@@ -20,7 +21,7 @@ function downstream_recursive!(
     from::Vector{Cell},
 )
     for cell in from
-        one_down = Pluto.where_referenced(notebook, topology, cell)
+        one_down = PlutoDependencyExplorer.where_referenced(topology, cell)
         for next in one_down
             if next ∉ found
                 push!(found, next)
@@ -52,7 +53,7 @@ function upstream_recursive!(
 )
     for cell in from
         references = topology.nodes[cell].references
-        for upstream in Pluto.where_assigned(notebook, topology, references)
+        for upstream in PlutoDependencyExplorer.where_assigned(topology, references)
             if upstream ∉ found
                 push!(found, upstream)
                 upstream_recursive!(found, notebook, topology, Cell[upstream])