diff --git a/src/all_shaders.zig b/src/all_shaders.zig
index a855bba..fb7eac8 100644
--- a/src/all_shaders.zig
+++ b/src/all_shaders.zig
@@ -107,7 +107,7 @@ pub const ShaderProgram = struct {
     pub fn attribLocation(sp: ShaderProgram, name: [*]const u8) c.GLint {
         const id = c.glGetAttribLocation(sp.program_id, name);
         if (id == -1) {
-            panic("invalid attrib: {}\n", .{name});
+            panic("invalid attrib: {*}\n", .{name});
         }
         return id;
     }
@@ -115,7 +115,7 @@ pub const ShaderProgram = struct {
     pub fn uniformLocation(sp: ShaderProgram, name: [*]const u8) c.GLint {
         const id = c.glGetUniformLocation(sp.program_id, name);
         if (id == -1) {
-            panic("invalid uniform: {}\n", .{name});
+            panic("invalid uniform: {*}\n", .{name});
         }
         return id;
     }
@@ -169,7 +169,7 @@ pub const ShaderProgram = struct {
         c.glGetProgramiv(sp.program_id, c.GL_INFO_LOG_LENGTH, &error_size);
         const message = try c_allocator.alloc(u8, @intCast(usize, error_size));
         c.glGetProgramInfoLog(sp.program_id, error_size, &error_size, message.ptr);
-        panic("Error linking shader program: {}\n", .{message.ptr});
+        panic("Error linking shader program: {*}\n", .{message.ptr});
     }
 
     pub fn destroy(sp: *ShaderProgram) void {
@@ -205,5 +205,5 @@ fn initGlShader(source: []const u8, name: [*]const u8, kind: c.GLenum) !c.GLuint
 
     const message = try c_allocator.alloc(u8, @intCast(usize, error_size));
     c.glGetShaderInfoLog(shader_id, error_size, &error_size, message.ptr);
-    panic("Error compiling {} shader:\n{}\n", .{ name, message.ptr });
+    panic("Error compiling {*} shader:\n{*}\n", .{ name, message.ptr });
 }
diff --git a/src/debug_gl.zig b/src/debug_gl.zig
index 2fdcda0..543202b 100644
--- a/src/debug_gl.zig
+++ b/src/debug_gl.zig
@@ -2,7 +2,7 @@ const c = @import("c.zig");
 const std = @import("std");
 const os = std.os;
 const panic = std.debug.panic;
-const builtin = @import("builtin");
+const builtin = std.builtin;
 
 pub const is_on = if (builtin.mode == builtin.Mode.ReleaseFast) c.GL_FALSE else c.GL_TRUE;
 
diff --git a/src/main.zig b/src/main.zig
index fd83f8a..fa5f264 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -19,7 +19,7 @@ var static_geometry: StaticGeometry = undefined;
 var font: Spritesheet = undefined;
 
 fn errorCallback(err: c_int, description: [*c]const u8) callconv(.C) void {
-    panic("Error: {}\n", .{@as([*:0]const u8, description)});
+    panic("Error: {s}\n", .{@as([*:0]const u8, description)});
 }
 
 fn keyCallback(win: ?*c.GLFWwindow, key: c_int, scancode: c_int, action: c_int, mods: c_int) callconv(.C) void {
@@ -95,9 +95,10 @@ pub fn main() !void {
     defer font.deinit();
 
     var seed_bytes: [@sizeOf(u64)]u8 = undefined;
-    std.crypto.randomBytes(seed_bytes[0..]) catch |err| {
-        panic("unable to seed random number generator: {}", .{err});
-    };
+    std.crypto.random.bytes(seed_bytes[0..]);
+// catch {
+//        panic("unable to seed random number generator", .{});
+//    };
     t.prng = std.rand.DefaultPrng.init(std.mem.readIntNative(u64, &seed_bytes));
     t.rand = &t.prng.random;