diff --git a/os3/src/config.rs b/os3/src/config.rs
index 70cb487..cf21900 100644
--- a/os3/src/config.rs
+++ b/os3/src/config.rs
@@ -1,5 +1,5 @@
-pub const USER_STACK_SIZE: usize = 8192;
-pub const KERNEL_STACK_SIZE: usize = 8192 * 20;
+pub const USER_STACK_SIZE: usize = 4096;
+pub const KERNEL_STACK_SIZE: usize = 4096 * 20;
 pub const KERNEL_HEAP_SIZE: usize = 0x20000;
 pub const MAX_APP_NUM: usize = 16;
 pub const APP_BASE_ADDRESS: usize = 0x80400000;