diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index 8db7c1f9e..b5caca628 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt
@@ -41,6 +41,9 @@ HOW TO UPDATE?
 
 Breaking changes:
 
+- Removed old nested structure: renaming ImGuiStorage::ImGuiStoragePair type to
+  ImGuiStoragePair (simpler for many languages). No significant nested type left.
+
 Other changes:
 
 - Examples: GLFW+Vulkan, SDL+Vulkan: handle swap chain resize even without Vulkan
diff --git a/imgui.cpp b/imgui.cpp
index d4d3a8a76..e16dea2ac 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -430,6 +430,7 @@ CODE
  When you are not sure about an old symbol or function name, try using the Search/Find function of your IDE to look for comments or references in all imgui files.
  You can read releases logs https://github.com/ocornut/imgui/releases for more details.
 
+ - 2024/06/10 (1.90.9) - removed old nested structure: renaming ImGuiStorage::ImGuiStoragePair type to ImGuiStoragePair (simpler for many languages).
  - 2024/06/06 (1.90.8) - reordered ImGuiInputTextFlags values. This should not be breaking unless you are using generated headers that have values not matching the main library.
  - 2024/06/06 (1.90.8) - removed 'ImGuiButtonFlags_MouseButtonDefault_ = ImGuiButtonFlags_MouseButtonLeft', was mostly unused and misleading.
  - 2024/05/27 (1.90.7) - commented out obsolete symbols marked obsolete in 1.88 (May 2022):
@@ -2502,15 +2503,14 @@ void ImGui::ColorConvertHSVtoRGB(float h, float s, float v, float& out_r, float&
 //-----------------------------------------------------------------------------
 
 // std::lower_bound but without the bullshit
-static ImGuiStorage::ImGuiStoragePair* LowerBound(ImVector<ImGuiStorage::ImGuiStoragePair>& data, ImGuiID key)
+static ImGuiStoragePair* LowerBound(ImVector<ImGuiStoragePair>& data, ImGuiID key)
 {
-    ImGuiStorage::ImGuiStoragePair* first = data.Data;
-    ImGuiStorage::ImGuiStoragePair* last = data.Data + data.Size;
-    size_t count = (size_t)(last - first);
-    while (count > 0)
+    ImGuiStoragePair* first = data.Data;
+    ImGuiStoragePair* last = data.Data + data.Size;
+    for (size_t count = (size_t)(last - first); count > 0; )
     {
         size_t count2 = count >> 1;
-        ImGuiStorage::ImGuiStoragePair* mid = first + count2;
+        ImGuiStoragePair* mid = first + count2;
         if (mid->key < key)
         {
             first = ++mid;
@@ -15419,7 +15419,7 @@ void ImGui::DebugNodeStorage(ImGuiStorage* storage, const char* label)
 {
     if (!TreeNode(label, "%s: %d entries, %d bytes", label, storage->Data.Size, storage->Data.size_in_bytes()))
         return;
-    for (const ImGuiStorage::ImGuiStoragePair& p : storage->Data)
+    for (const ImGuiStoragePair& p : storage->Data)
         BulletText("Key 0x%08X Value { i: %d }", p.key, p.val_i); // Important: we currently don't store a type, real value may not be integer.
     TreePop();
 }
diff --git a/imgui.h b/imgui.h
index d3a74704a..c48fd4c75 100644
--- a/imgui.h
+++ b/imgui.h
@@ -28,7 +28,7 @@
 // Library Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM >= 12345')
 #define IMGUI_VERSION       "1.90.9 WIP"
-#define IMGUI_VERSION_NUM   19080
+#define IMGUI_VERSION_NUM   19081
 #define IMGUI_HAS_TABLE
 
 /*
@@ -178,7 +178,8 @@ struct ImGuiOnceUponAFrame;         // Helper for running a block of code not mo
 struct ImGuiPayload;                // User data payload for drag and drop operations
 struct ImGuiPlatformImeData;        // Platform IME data for io.SetPlatformImeDataFn() function.
 struct ImGuiSizeCallbackData;       // Callback data when using SetNextWindowSizeConstraints() (rare/advanced use)
-struct ImGuiStorage;                // Helper for key->value storage
+struct ImGuiStorage;                // Helper for key->value storage (container sorted by key)
+struct ImGuiStoragePair;            // Helper for key->value storage (pair)
 struct ImGuiStyle;                  // Runtime data for styling/colors
 struct ImGuiTableSortSpecs;         // Sorting specifications for a table (often handling sort specs for a single column, occasionally more)
 struct ImGuiTableColumnSortSpecs;   // Sorting specification for one column of a table
@@ -2460,6 +2461,16 @@ struct ImGuiTextBuffer
     IMGUI_API void      appendfv(const char* fmt, va_list args) IM_FMTLIST(2);
 };
 
+// [Internal] Key+Value for ImGuiStorage
+struct ImGuiStoragePair
+{
+    ImGuiID     key;
+    union       { int val_i; float val_f; void* val_p; };
+    ImGuiStoragePair(ImGuiID _key, int _val)    { key = _key; val_i = _val; }
+    ImGuiStoragePair(ImGuiID _key, float _val)  { key = _key; val_f = _val; }
+    ImGuiStoragePair(ImGuiID _key, void* _val)  { key = _key; val_p = _val; }
+};
+
 // Helper: Key->Value storage
 // Typically you don't have to worry about this since a storage is held within each Window.
 // We use it to e.g. store collapse state for a tree (Int 0/1)
@@ -2471,15 +2482,6 @@ struct ImGuiTextBuffer
 struct ImGuiStorage
 {
     // [Internal]
-    struct ImGuiStoragePair
-    {
-        ImGuiID key;
-        union { int val_i; float val_f; void* val_p; };
-        ImGuiStoragePair(ImGuiID _key, int _val)    { key = _key; val_i = _val; }
-        ImGuiStoragePair(ImGuiID _key, float _val)  { key = _key; val_f = _val; }
-        ImGuiStoragePair(ImGuiID _key, void* _val)  { key = _key; val_p = _val; }
-    };
-
     ImVector<ImGuiStoragePair>      Data;
 
     // - Get***() functions find pair, never add/allocate. Pairs are sorted so a query is O(log N)
@@ -2508,6 +2510,10 @@ struct ImGuiStorage
     IMGUI_API void      BuildSortByKey();
     // Obsolete: use on your own storage if you know only integer are being stored (open/close all tree nodes)
     IMGUI_API void      SetAllInt(int val);
+
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+    //typedef ::ImGuiStoragePair ImGuiStoragePair;  // 1.90.8: moved type outside struct
+#endif
 };
 
 // Helper: Manually clip large list of items.