diff --git a/cmake/FindOptiX.cmake b/cmake/FindOptiX.cmake
index 0481669..298270f 100644
--- a/cmake/FindOptiX.cmake
+++ b/cmake/FindOptiX.cmake
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2018 NVIDIA CORPORATION. All rights reserved.
+# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -31,11 +31,18 @@
 # Our initial guess will be within the SDK.
 set(OptiX_INSTALL_DIR "${CMAKE_SOURCE_DIR}/redner-dependencies/optix" CACHE PATH "Path to OptiX installed location.")
 
-# The distribution contains both 32 and 64 bit libraries.  Adjust the library
+# The distribution contains only 64 bit libraries.  Error when we have been mis-configured.
+if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
+  if(WIN32)
+    message(SEND_ERROR "Make sure when selecting the generator, you select one with Win64 or x64.")
+  endif()
+  message(FATAL_ERROR "OptiX only supports builds configured for 64 bits.")
+endif()
+
 # search path based on the bit-ness of the build.  (i.e. 64: bin64, lib64; 32:
 # bin, lib).  Note that on Mac, the OptiX library is a universal binary, so we
 # only need to look in lib and not lib64 for 64 bit builds.
-if(CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT APPLE)
+if(NOT APPLE)
   set(bit_dest "64")
 else()
   set(bit_dest "")
@@ -62,9 +69,9 @@ macro(OPTIX_find_api_library name version)
   endif()
 endmacro()
 
-OPTIX_find_api_library(optix 51)
-OPTIX_find_api_library(optixu 1)
-OPTIX_find_api_library(optix_prime 1)
+OPTIX_find_api_library(optix 6.5.0)
+OPTIX_find_api_library(optixu 6.5.0)
+OPTIX_find_api_library(optix_prime 6.5.0)
 
 # Include
 find_path(OptiX_INCLUDE
@@ -77,9 +84,12 @@ find_path(OptiX_INCLUDE
   )
 
 # Check to make sure we found what we were looking for
-function(OptiX_report_error error_message required)
+function(OptiX_report_error error_message required component )
+  if(DEFINED OptiX_FIND_REQUIRED_${component} AND NOT OptiX_FIND_REQUIRED_${component})
+    set(required FALSE)
+  endif()
   if(OptiX_FIND_REQUIRED AND required)
-    message(FATAL_ERROR "${error_message}")
+    message(FATAL_ERROR "${error_message}  Please locate before proceeding.")
   else()
     if(NOT OptiX_FIND_QUIETLY)
       message(STATUS "${error_message}")
@@ -87,14 +97,14 @@ function(OptiX_report_error error_message required)
   endif()
 endfunction()
 
-#if(NOT optix_LIBRARY)
-#  OptiX_report_error("optix library not found.  Please locate before proceeding." TRUE)
-#endif()
+if(NOT optix_LIBRARY)
+  OptiX_report_error("optix library not found." TRUE libraries )
+endif()
 if(NOT OptiX_INCLUDE)
-  OptiX_report_error("OptiX headers (optix.h and friends) not found.  Please locate before proceeding." TRUE)
+  OptiX_report_error("OptiX headers (optix.h and friends) not found." TRUE headers )
 endif()
 if(NOT optix_prime_LIBRARY)
-  OptiX_report_error("optix Prime library not found.  Please locate before proceeding." FALSE)
+  OptiX_report_error("optix Prime library not found." TRUE libraries )
 endif()
 
 # Macro for setting up dummy targets
diff --git a/redner-dependencies b/redner-dependencies
index 7d8e73e..04e911f 160000
--- a/redner-dependencies
+++ b/redner-dependencies
@@ -1 +1 @@
-Subproject commit 7d8e73ebfc43a2642c5c56fd41553ae278f76e92
+Subproject commit 04e911f980e86cc64bd18180afd4e5ec6a8aab01
diff --git a/setup.py b/setup.py
index fb2893f..c6eb959 100644
--- a/setup.py
+++ b/setup.py
@@ -124,13 +124,13 @@ def build_extension(self, ext):
     dynamic_libraries.append('redner-dependencies/embree/lib-linux/libtbb.so.2')
     dynamic_libraries.append('redner-dependencies/embree/lib-linux/libtbbmalloc.so.2')
     if build_with_cuda:
-        dynamic_libraries.append('redner-dependencies/optix/lib64/liboptix_prime.so.1')
+        dynamic_libraries.append('redner-dependencies/optix/lib64/liboptix_prime.so.6.5.0')
 elif sys.platform == 'win32':
     dynamic_libraries.append('redner-dependencies/embree/bin/embree3.dll')
     dynamic_libraries.append('redner-dependencies/embree/bin/tbb.dll')
     dynamic_libraries.append('redner-dependencies/embree/bin/tbbmalloc.dll')
     if build_with_cuda:
-        dynamic_libraries.append('redner-dependencies/optix/bin64/optix_prime.1.dll')
+        dynamic_libraries.append('redner-dependencies/optix/bin64/optix_prime.6.5.0.dll')
 
 project_name = 'redner'
 if 'PROJECT_NAME' in os.environ: