diff -up VTK-9.0.1/Geovis/Core/vtkGeoProjection.cxx.proj5 VTK-9.0.1/Geovis/Core/vtkGeoProjection.cxx
--- VTK-9.0.1/Geovis/Core/vtkGeoProjection.cxx.proj5	2020-06-26 07:24:40.000000000 -0600
+++ VTK-9.0.1/Geovis/Core/vtkGeoProjection.cxx	2021-03-13 11:36:29.049321435 -0700
@@ -121,7 +121,11 @@ vtkGeoProjection::~vtkGeoProjection()
   this->SetPROJ4String(nullptr);
   if (this->Projection)
   {
+#if PROJ_VERSION_MAJOR >= 5
+    proj_destroy(this->Projection);
+#else
     pj_free(this->Projection);
+#endif
   }
   delete this->Internals;
   this->Internals = nullptr;
@@ -185,13 +189,21 @@ int vtkGeoProjection::UpdateProjection()
 
   if (this->Projection)
   {
+#if PROJ_VERSION_MAJOR >= 5
+    proj_destroy(this->Projection);
+#else
     pj_free(this->Projection);
+#endif
     this->Projection = nullptr;
   }
 
   if (this->PROJ4String && strlen(this->PROJ4String))
   {
+#if PROJ_VERSION_MAJOR >= 5
+    this->Projection = proj_create(PJ_DEFAULT_CTX, this->PROJ4String);
+#else
     this->Projection = pj_init_plus(this->PROJ4String);
+#endif
   }
   else
   {
@@ -230,8 +242,11 @@ int vtkGeoProjection::UpdateProjection()
       stringHolder[i] = param.str();
       pjArgs[3 + i] = stringHolder[i].c_str();
     }
-
+#if PROJ_VERSION_MAJOR >= 5
+    this->Projection = proj_create_argv(PJ_DEFAULT_CTX, argSize, const_cast<char**>(pjArgs));
+#else
     this->Projection = pj_init(argSize, const_cast<char**>(pjArgs));
+#endif
     delete[] pjArgs;
   }
   this->ProjectionMTime = this->GetMTime();
diff -up VTK-9.0.1/Geovis/Core/vtkGeoTransform.cxx.proj5 VTK-9.0.1/Geovis/Core/vtkGeoTransform.cxx
--- VTK-9.0.1/Geovis/Core/vtkGeoTransform.cxx.proj5	2020-06-26 07:24:40.000000000 -0600
+++ VTK-9.0.1/Geovis/Core/vtkGeoTransform.cxx	2021-03-13 11:35:13.646115813 -0700
@@ -163,8 +163,12 @@ void vtkGeoTransform::InternalTransformP
   projPJ src = this->SourceProjection ? this->SourceProjection->GetProjection() : nullptr;
   projPJ dst = this->DestinationProjection ? this->DestinationProjection->GetProjection() : nullptr;
   int delta = stride - 2;
+#if PROJ_VERSION_MAJOR >= 5
+  PJ_COORD c, c_out;
+#else
   projLP lp;
   projXY xy;
+#endif
   if (src)
   {
     // Convert from src system to lat/long using inverse of src transform
@@ -172,17 +176,15 @@ void vtkGeoTransform::InternalTransformP
     for (vtkIdType i = 0; i < numPts; ++i)
     {
 #if PROJ_VERSION_MAJOR >= 5
-      xy.x = coord[0];
-      xy.y = coord[1];
+      c.xy.x = coord[0];
+      c.xy.y = coord[1];
+      c_out = proj_trans(src, PJ_INV, c);
+      coord[0] = c_out.lp.lam;
+      coord[1] = c_out.lp.phi;
 #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
@@ -208,17 +210,15 @@ void vtkGeoTransform::InternalTransformP
     for (vtkIdType i = 0; i < numPts; ++i)
     {
 #if PROJ_VERSION_MAJOR >= 5
-      lp.lam = coord[0];
-      lp.phi = coord[1];
+      c.lp.lam = coord[0];
+      c.lp.phi = coord[1];
+      c_out = proj_trans(src, PJ_FWD, c);
+      coord[0] = c_out.xy.x;
+      coord[1] = c_out.xy.y;
 #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
diff -up VTK-9.0.1/ThirdParty/libproj/vtk_libproj.h.in.proj5 VTK-9.0.1/ThirdParty/libproj/vtk_libproj.h.in
--- VTK-9.0.1/ThirdParty/libproj/vtk_libproj.h.in.proj5	2020-06-26 07:24:40.000000000 -0600
+++ VTK-9.0.1/ThirdParty/libproj/vtk_libproj.h.in	2021-03-13 11:35:13.646115813 -0700
@@ -28,14 +28,9 @@
 #if VTK_MODULE_USE_EXTERNAL_vtklibproj
 # if VTK_LibPROJ_MAJOR_VERSION >= 5
 #  include <proj.h>
-# endif
-# if VTK_LibPROJ_MAJOR_VERSION < 6
+# else
 #  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
 # include <vtklibproj/src/projects.h>