diff --git a/lib/process_tree.ex b/lib/process_tree.ex
index 9e340c9..6ccf70b 100644
--- a/lib/process_tree.ex
+++ b/lib/process_tree.ex
@@ -31,7 +31,7 @@ defmodule ProcessTree do
 
   Returns the first non-nil value found in the tree. If no value is found, returns `nil`.
   """
-  @spec get(term()) :: any()
+  @spec get(term()) :: term()
   def get(key) do
     case Process.get(key) do
       nil ->
@@ -63,7 +63,7 @@ defmodule ProcessTree do
   value = ProcessTree.get(:some_key, default: default_value)
   ```
   """
-  @spec get(term(), default: any()) :: any()
+  @spec get(term(), default: term()) :: term()
   def get(key, default: default_value) do
     case get(key) do
       nil ->
@@ -200,7 +200,7 @@ defmodule ProcessTree do
     defp process_info_parent(_pid), do: nil
   end
 
-  @spec ancestor_value(any(), id(), [id()]) :: any()
+  @spec ancestor_value(term(), id(), [id()]) :: term()
   defp ancestor_value(key, pid_or_name, dictionary_ancestors) do
     cond do
       (value = get_dictionary_value(pid_or_name, key)) != nil ->
@@ -220,7 +220,7 @@ defmodule ProcessTree do
     end
   end
 
-  @spec get_dictionary_value(id(), atom()) :: any()
+  @spec get_dictionary_value(id(), atom()) :: term()
   defp get_dictionary_value(nil, _key), do: nil
 
   defp get_dictionary_value(name, _key) when is_atom(name) do