diff --git a/src/graph.luau b/src/graph.luau
index cdc00cc..dac2e09 100644
--- a/src/graph.luau
+++ b/src/graph.luau
@@ -58,6 +58,11 @@ local function get_scope(): Node<unknown>?
     return scopes[scopes.n]
 end
 
+local function bump_update_id()
+    update_id += 1
+    return update_id
+end
+
 local function assert_stable_scope(): Node<unknown>
     local scope = get_scope()
 
@@ -246,9 +251,8 @@ local function flush_update_queue(from: number)
     update_queue.n = from
 end
 
-local function update_descendants<T>(root: SourceNode<T>, is_root_update: boolean?)
+local function update_descendants<T>(root: SourceNode<T>)
     local n0 = update_queue.n
-    if is_root_update and not flags.batch then update_id += 1 end
     queue_children_for_update(root)
 
     if flags.batch then return end
@@ -324,6 +328,7 @@ return table.freeze {
     flush_update_queue = flush_update_queue,
     get_update_queue_length = get_update_queue_length,
     set_context = set_context,
+    bump_update_id = bump_update_id,
     scopes = scopes,
 
     q = update_queue
diff --git a/src/maps.luau b/src/maps.luau
index 2150939..6add44b 100644
--- a/src/maps.luau
+++ b/src/maps.luau
@@ -86,7 +86,8 @@ local function indexes<K, VI, VO>(input: () -> Map<K, VI>, transform: (() -> VI,
                     output_cache[i] = result
                 else -- update source
                     input_nodes[i].cache = v
-                    update_descendants(input_nodes[i], true)
+                    graph.bump_update_id()
+                    update_descendants(input_nodes[i])
                 end
             end
         end
@@ -170,7 +171,8 @@ local function values<K, VI, VO>(input: () -> Map<K, VI>, transform: (VI, () ->
             else -- update source
                 if cv ~= i then
                     input_nodes[v].cache = i
-                    update_descendants(input_nodes[v], true)
+                    graph.bump_update_id()
+                    update_descendants(input_nodes[v])
                 end
 
                 cur_input_cache[v] = nil
diff --git a/src/source.luau b/src/source.luau
index 36c4609..3341362 100644
--- a/src/source.luau
+++ b/src/source.luau
@@ -21,7 +21,8 @@ local function source<T>(initial_value: T): Source<T>
         end
 
         node.cache = v
-        update_descendants(node, true)
+        graph.bump_update_id()
+        update_descendants(node)
         return v
     end
 
diff --git a/src/spring.luau b/src/spring.luau
index 936a18f..47af352 100644
--- a/src/spring.luau
+++ b/src/spring.luau
@@ -285,7 +285,8 @@ local function update_spring_sources()
             output.cache = vec6_to_type[typeof(data.source_value)](x0_123, x0_456)
         end
 
-        update_descendants(output, true)
+        graph.bump_update_id()
+        update_descendants(output)
     end
 end
 
diff --git a/test/tests.luau b/test/tests.luau
index c808de2..4b50483 100644
--- a/test/tests.luau
+++ b/test/tests.luau
@@ -36,6 +36,7 @@ vide.strict = false
 TEST("graph", function()
     local create_node = graph.create_node
     local push_child_to_scope = graph.push_child_to_scope
+    local bump_update_id = graph.bump_update_id
     local update_descendants = graph.update_descendants
     local push_child = graph.push_child
     local get_scope = graph.get_scope
@@ -98,9 +99,13 @@ TEST("graph", function()
         pop_scope()
         
         CHECK(count == 1)
-        update_descendants(a, true)
+
+        bump_update_id()
+        update_descendants(a)
         CHECK(count == 2)
-        update_descendants(b, true)
+        
+        bump_update_id()
+        update_descendants(b)
         CHECK(count == 3)
     end
 
@@ -119,7 +124,8 @@ TEST("graph", function()
         push_scope(c); push_child_to_scope(a); pop_scope()
         push_scope(d); push_child_to_scope(b); push_child_to_scope(c); pop_scope()
 
-        update_descendants(a, true)
+        bump_update_id()
+        update_descendants(a)
 
         CHECK(b_cnt == 1)
         CHECK(c_cnt == 1)
@@ -138,7 +144,8 @@ TEST("graph", function()
 
         push_scope(c); assert(type(c.effect) == "function" and c.effect)(NIL); pop_scope()
 
-        update_descendants(a, true)
+        bump_update_id()
+        update_descendants(a)
 
         CHECK(#get_children(a) == 1)
         CHECK(#get_children(b) == 1)
@@ -286,14 +293,16 @@ TEST("graph", function()
         local a, b, c, d, e, f = node(root), node(root), node(root), node(root), node(root), node(root)
 
         function b.effect(x)
-            update_descendants(d, true)
+            bump_update_id()
+            update_descendants(d)
             return not x
         end
 
         push_child(a, b); push_child(a, c)
         push_child(d, e); push_child(d, f)
 
-        update_descendants(a, true)
+        bump_update_id()
+        update_descendants(a)
 
         CHECK(true)
     end