diff --git a/src/main.c b/src/main.c
index 6cdf547..832dfb5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -37,8 +37,8 @@ int main()
   glfwInit();
   glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_API);
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
-  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
-  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_ANY_PROFILE);
 
   GLFWwindow* window = glfwCreateWindow(vp_width, vp_height, "advent-of-pixel-shaders", NULL, NULL);
   if (window == NULL) {
diff --git a/src/opengl.c b/src/opengl.c
index ef37465..f3620a4 100644
--- a/src/opengl.c
+++ b/src/opengl.c
@@ -43,6 +43,8 @@ uint compile_shader(const void * vp,
 
   glAttachShader(shader_program, vertex_shader);
   glAttachShader(shader_program, fragment_shader);
+
+  glBindAttribLocation(shader_program, 0, "position");
   glLinkProgram(shader_program);
 
   {
diff --git a/src/solution/2025/01/solution.fs.glsl b/src/solution/2025/01/solution.fs.glsl
index b45e357..b69cb42 100644
--- a/src/solution/2025/01/solution.fs.glsl
+++ b/src/solution/2025/01/solution.fs.glsl
@@ -1,4 +1,4 @@
-#version 330 core
+#version 130
 
 out vec4 fragment_color;
 
diff --git a/src/solution/2025/03/parse_input.fs.glsl b/src/solution/2025/03/parse_input.fs.glsl
index fec9d31..d29ef5a 100644
--- a/src/solution/2025/03/parse_input.fs.glsl
+++ b/src/solution/2025/03/parse_input.fs.glsl
@@ -1,4 +1,4 @@
-#version 330 core
+#version 130
 
 uniform sampler2D input_sampler;
 uniform vec4 input_dim; // w h halfpx_w halfpx_h
diff --git a/src/solution/2025/03/solution.fs.glsl b/src/solution/2025/03/solution.fs.glsl
index 2bce4f9..c6358eb 100644
--- a/src/solution/2025/03/solution.fs.glsl
+++ b/src/solution/2025/03/solution.fs.glsl
@@ -1,4 +1,4 @@
-#version 330 core
+#version 130
 
 uniform sampler2D input_sampler;
 uniform vec4 input_dim; // w h halfpx_w halfpx_h
diff --git a/src/solution/2025/04/count.fs.glsl b/src/solution/2025/04/count.fs.glsl
index 4830b8f..02f4302 100644
--- a/src/solution/2025/04/count.fs.glsl
+++ b/src/solution/2025/04/count.fs.glsl
@@ -1,4 +1,4 @@
-#version 330 core
+#version 130
 
 uniform sampler2D input_sampler_a;
 uniform sampler2D input_sampler_b;
diff --git a/src/solution/2025/04/simulate.fs.glsl b/src/solution/2025/04/simulate.fs.glsl
index 86cc126..e129593 100644
--- a/src/solution/2025/04/simulate.fs.glsl
+++ b/src/solution/2025/04/simulate.fs.glsl
@@ -1,4 +1,4 @@
-#version 330 core
+#version 130
 
 uniform sampler2D input_sampler;
 uniform vec4 dim; // w h halfpx_w halfpx_h
diff --git a/src/solution/generic.vs.glsl b/src/solution/generic.vs.glsl
index e1b1518..38964bc 100644
--- a/src/solution/generic.vs.glsl
+++ b/src/solution/generic.vs.glsl
@@ -1,6 +1,6 @@
-#version 330 core
+#version 130
 
-layout (location = 0) in vec2 position;
+in vec2 position;
 
 out vec2 f_position;