diff --git a/src/8.guest/2021/2.csm/shadow_mapping.cpp b/src/8.guest/2021/2.csm/shadow_mapping.cpp
index 1fc927c..3dedb4f 100644
--- a/src/8.guest/2021/2.csm/shadow_mapping.cpp
+++ b/src/8.guest/2021/2.csm/shadow_mapping.cpp
@@ -72,8 +72,8 @@ int main()
     // glfw: initialize and configure
     // ------------------------------
     glfwInit();
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
     glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
 
 #ifdef __APPLE__