diff --git a/Geovis/Core/vtkGeoProjection.cxx b/Geovis/Core/vtkGeoProjection.cxx
index f3a8852..8240603 100644
--- a/Geovis/Core/vtkGeoProjection.cxx
+++ b/Geovis/Core/vtkGeoProjection.cxx
@@ -72,6 +72,9 @@ public:
   }
 
   std::map< std::string, std::string > OptionalParameters;
+#if PROJ_VERSION_MAJOR >= 5
+  PJ_PROJ_INFO ProjInfo;
+#endif
 };
 
 //-----------------------------------------------------------------------------
@@ -80,7 +83,7 @@ int vtkGeoProjection::GetNumberOfProjections()
   if ( vtkGeoProjectionNumProj < 0 )
   {
     vtkGeoProjectionNumProj = 0;
-    for ( const PJ_LIST* pj = pj_get_list_ref(); pj && pj->id; ++ pj )
+    for ( const PJ_LIST* pj = proj_list_operations(); pj && pj->id; ++ pj )
       ++ vtkGeoProjectionNumProj;
   }
   return vtkGeoProjectionNumProj;
@@ -91,7 +94,7 @@ const char* vtkGeoProjection::GetProjectionName( int projection )
   if ( projection < 0 || projection >= vtkGeoProjection::GetNumberOfProjections() )
     return nullptr;
 
-  return pj_get_list_ref()[projection].id;
+  return proj_list_operations()[projection].id;
 }
 //-----------------------------------------------------------------------------
 const char* vtkGeoProjection::GetProjectionDescription( int projection )
@@ -99,7 +102,7 @@ const char* vtkGeoProjection::GetProjectionDescription( int projection )
   if ( projection < 0 || projection >= vtkGeoProjection::GetNumberOfProjections() )
     return nullptr;
 
-  return pj_get_list_ref()[projection].descr[0];
+  return proj_list_operations()[projection].descr[0];
 }
 //-----------------------------------------------------------------------------
 vtkGeoProjection::vtkGeoProjection()
@@ -144,7 +147,7 @@ void vtkGeoProjection::PrintSelf( ostream& os, vtkIndent indent )
 int vtkGeoProjection::GetIndex()
 {
   int i = 0;
-  for ( const PJ_LIST* proj = pj_get_list_ref(); proj && proj->id; ++ proj, ++ i )
+  for ( const PJ_LIST* proj = proj_list_operations(); proj && proj->id; ++ proj, ++ i )
   {
     if ( ! strcmp( proj->id, this->Name ) )
     {
@@ -161,7 +164,11 @@ const char* vtkGeoProjection::GetDescription()
   {
     return nullptr;
   }
+#if PROJ_VERSION_MAJOR >= 5
+  return this->Internals->ProjInfo.description;
+#else
   return this->Projection->descr;
+#endif
 }
 //-----------------------------------------------------------------------------
 projPJ vtkGeoProjection::GetProjection()
@@ -232,6 +239,9 @@ int vtkGeoProjection::UpdateProjection()
   this->ProjectionMTime = this->GetMTime();
   if ( this->Projection )
   {
+#if PROJ_VERSION_MAJOR >= 5
+    this->Internals->ProjInfo = proj_pj_info(this->Projection);
+#endif
     return 0;
   }
   return 1;
diff --git a/Geovis/Core/vtkGeoTransform.cxx b/Geovis/Core/vtkGeoTransform.cxx
index aeeabc1..b80a8c0 100644
--- a/Geovis/Core/vtkGeoTransform.cxx
+++ b/Geovis/Core/vtkGeoTransform.cxx
@@ -167,9 +167,17 @@ void vtkGeoTransform::InternalTransformPoints( double* x, vtkIdType numPts, int
     double* coord = x;
     for ( vtkIdType i = 0; i < numPts; ++ i )
     {
+#if PROJ_VERSION_MAJOR >= 5
+      xy.x = coord[0]; xy.y = coord[1];
+#else
       xy.u = coord[0]; xy.v = coord[1];
+#endif
       lp = pj_inv( xy, src );
+#if PROJ_VERSION_MAJOR >= 5
+      coord[0] = lp.lam; coord[1] = lp.phi;
+#else
       coord[0] = lp.u; coord[1] = lp.v;
+#endif
       coord += stride;
     }
   }
@@ -191,9 +199,17 @@ void vtkGeoTransform::InternalTransformPoints( double* x, vtkIdType numPts, int
     double* coord = x;
     for ( vtkIdType i = 0; i < numPts; ++ i )
     {
+#if PROJ_VERSION_MAJOR >= 5
+      lp.lam = coord[0]; lp.phi = coord[1];
+#else
       lp.u = coord[0]; lp.v = coord[1];
+#endif
       xy = pj_fwd( lp, dst );
+#if PROJ_VERSION_MAJOR >= 5
+      coord[0] = xy.x; coord[1] = xy.y;
+#else
       coord[0] = xy.u; coord[1] = xy.v;
+#endif
       coord += stride;
     }
   }
diff --git a/ThirdParty/libproj/CMakeLists.txt b/ThirdParty/libproj/CMakeLists.txt
index a19609e..e23e44b 100644
--- a/ThirdParty/libproj/CMakeLists.txt
+++ b/ThirdParty/libproj/CMakeLists.txt
@@ -1,4 +1,9 @@
 vtk_module_third_party(LibPROJ
   LIBRARIES vtklibproj
+  USE_VARIABLES LibPROJ_MAJOR_VERSION
   INCLUDE_DIRS ${vtklibproj_SOURCE_DIR}/vtklibproj
                ${vtklibproj_BINARY_DIR}/vtklibproj)
+
+if (NOT VTK_MODULE_USE_EXTERNAL_VTK_libproj)
+  set(LibPROJ_MAJOR_VERSION "4")
+endif ()
\ No newline at end of file
diff --git a/ThirdParty/libproj/vtk_libproj.h.in b/ThirdParty/libproj/vtk_libproj.h.in
index cd9edc3..d441a1a 100644
--- a/ThirdParty/libproj/vtk_libproj.h.in
+++ b/ThirdParty/libproj/vtk_libproj.h.in
@@ -17,8 +17,23 @@
 
 /* Use the libproj library configured for VTK.  */
 #cmakedefine VTK_USE_SYSTEM_LIBPROJ
+
+#define VTK_LibPROJ_MAJOR_VERSION @LibPROJ_MAJOR_VERSION@
+
+#if VTK_LibPROJ_MAJOR_VERSION < 5
+# define PROJ_VERSION_MAJOR @LibPROJ_MAJOR_VERSION@
+# define proj_list_operations pj_get_list_ref
+#endif
 #ifdef VTK_USE_SYSTEM_LIBPROJ
-# include <projects.h>
+# if VTK_LibPROJ_MAJOR_VERSION >= 5
+#  include <proj.h>
+# endif
+# if VTK_LibPROJ_MAJOR_VERSION < 6
+#  include <projects.h>
+# endif
+# if VTK_LibPROJ_MAJOR_VERSION >= 6
+#  define ACCEPT_USE_OF_DEPRECATED_PROJ_API_H 1
+# endif
 # include <proj_api.h>
 # include <geodesic.h>
 #else
diff --git a/CMake/FindLibPROJ.cmake b/CMake/FindLibPROJ.cmake
index 2d8301d..d8d08cd 100644
--- a/CMake/FindLibPROJ.cmake
+++ b/CMake/FindLibPROJ.cmake
@@ -5,6 +5,14 @@
 #   LibPROJ_LIBRARIES   to libproj4 and any dependent libraries
 # If LibPROJ_REQUIRED is defined, then a fatal error message will be generated if libproj4 is not found
 
+find_package(PROJ4 6 CONFIG REQUIRED)
+if (PROJ4_FOUND)
+    set(LibPROJ_FOUND 1)
+    set(LibPROJ_INCLUDE_DIR ${PROJ4_INCLUDE_DIRS})
+    set(LibPROJ_LIBRARIES ${PROJ_LIBRARY})
+    set(LibPROJ_MAJOR_VERSION 6)
+endif()
+
 if ( NOT LibPROJ_INCLUDE_DIR OR NOT LibPROJ_LIBRARIES OR NOT LibPROJ_FOUND )
 
   if ( $ENV{LibPROJ_DIR} )