diff --git a/IO/OCCT/CMakeLists.txt b/IO/OCCT/CMakeLists.txt
index e81444eceb..4baddeb719 100644
--- a/IO/OCCT/CMakeLists.txt
+++ b/IO/OCCT/CMakeLists.txt
@@ -4,12 +4,25 @@ vtk_module_find_package(PRIVATE_IF_SHARED
   VERSION_VAR "@OpenCASCADE_MAJOR_VERSION@.@OpenCASCADE_MINOR_VERSION@.@OpenCASCADE_MAINTENANCE_VERSION@"
 )
 
-set(opencascade_req_targets
-  TKSTEP
-  TKIGES
-  TKMesh
-  TKXDESTEP
-  TKXDEIGES)
+if (OpenCASCADE_VERSION VERSION_GREATER_EQUAL "7.8.0")
+  set(opencascade_req_targets
+    TKDESTEP
+    TKDEIGES
+    TKernel
+    TKMath
+    TKMesh
+    TKBRep
+    TKXSBase
+    TKLCAF
+    TKXCAF)
+else()
+  set(opencascade_req_targets
+    TKSTEP
+    TKIGES
+    TKMesh
+    TKXDESTEP
+    TKXDEIGES)
+endif()
 set(opencascade_missing_targets)
 foreach (opencascade_req_target IN LISTS opencascade_req_targets)
   if (NOT TARGET "${opencascade_req_target}")
@@ -35,8 +48,7 @@ vtk_module_link(VTK::IOOCCT
     ${opencascade_req_targets})
 
 # OpenCASCADE started putting include directory usage requirements in 7.7.0.
-set(OpenCASCADE_VERSION
-  "${OpenCASCADE_MAJOR_VERSION}.${OpenCASCADE_MINOR_VERSION}.${OpenCASCADE_MAINTENANCE_VERSION}")
+
 if (OpenCASCADE_VERSION VERSION_LESS "7.7.0")
   vtk_module_include(VTK::IOOCCT PRIVATE "${OpenCASCADE_INCLUDE_DIR}")
 endif ()
diff --git a/IO/OCCT/vtkOCCTReader.cxx b/IO/OCCT/vtkOCCTReader.cxx
index 52e76be72c..5aca5c93c8 100644
--- a/IO/OCCT/vtkOCCTReader.cxx
+++ b/IO/OCCT/vtkOCCTReader.cxx
@@ -345,11 +345,19 @@ public:
   }
 
   //----------------------------------------------------------------------------
+#if VTK_OCCT_VERSION(7, 8, 0) <= OCC_VERSION_HEX
+  size_t GetHash(const TDF_Label& label)
+  {
+    TopoDS_Shape aShape;
+    return this->ShapeTool->GetShape(label, aShape) ? std::hash<TopoDS_Shape>{}(aShape) : 0;
+  }
+#else
   int GetHash(const TDF_Label& label)
   {
     TopoDS_Shape aShape;
     return this->ShapeTool->GetShape(label, aShape) ? aShape.HashCode(INT_MAX) : 0;
   }
+#endif
 
   //----------------------------------------------------------------------------
   static void GetMatrix(const TopLoc_Location& loc, vtkMatrix4x4* mat)
@@ -381,8 +389,11 @@ public:
       GetMatrix(hLoc->Get(), location);
     }
   }
-
+#if VTK_OCCT_VERSION(7, 8, 0) <= OCC_VERSION_HEX
+  std::unordered_map<size_t, vtkSmartPointer<vtkPolyData>> ShapeMap;
+#else
   std::unordered_map<int, vtkSmartPointer<vtkPolyData>> ShapeMap;
+#endif
   Handle(XCAFDoc_ShapeTool) ShapeTool;
   Handle(XCAFDoc_ColorTool) ColorTool;