diff --git a/backends/implot_backend.h b/backends/implot_backend.h
index 8aff43c..2343de7 100644
--- a/backends/implot_backend.h
+++ b/backends/implot_backend.h
@@ -20,7 +20,7 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
-// ImPlot v0.10 WIP
+// ImPlot v0.13 WIP
 
 #pragma once
 
diff --git a/backends/implot_impl_opengl3.h b/backends/implot_impl_opengl3.h
index 0655fcc..0b4681a 100644
--- a/backends/implot_impl_opengl3.h
+++ b/backends/implot_impl_opengl3.h
@@ -20,7 +20,7 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
-// ImPlot v0.10 WIP
+// ImPlot v0.13 WIP
 
 #pragma once
 
diff --git a/implot_items.cpp b/implot_items.cpp
index b2993ed..dc2195e 100644
--- a/implot_items.cpp
+++ b/implot_items.cpp
@@ -89,16 +89,6 @@ template <> const ImGuiDataType ImGuiDataTypeGetter<ImS32>::Value  = ImGuiDataTy
 template <> const ImGuiDataType ImGuiDataTypeGetter<ImU64>::Value  = ImGuiDataType_U64;
 template <> const ImGuiDataType ImGuiDataTypeGetter<ImS64>::Value  = ImGuiDataType_S64;
 
-//-----------------------------------------------------------------------------
-// Utils
-//-----------------------------------------------------------------------------
-
-// Calc maximum index size of ImDrawIdx
-template <typename T>
-struct MaxIdx { static const unsigned int Value; };
-template <> const unsigned int MaxIdx<unsigned short>::Value = 65535;
-template <> const unsigned int MaxIdx<unsigned int>::Value   = 4294967295;
-
 //-----------------------------------------------------------------------------
 // Item Utils
 //-----------------------------------------------------------------------------