diff --git a/riscemu/decoder/decoder.py b/riscemu/decoder/decoder.py
index b218ccd..f0601e8 100644
--- a/riscemu/decoder/decoder.py
+++ b/riscemu/decoder/decoder.py
@@ -15,6 +15,10 @@ STATIC_INSN: Dict[int, Tuple[str, List[Union[str, int]], int]] = {
     0x02010113: ("addi", ["sp", "sp", 32], 0x02010113),
     0x00100073: ("ebreak", [], 0x00100073),
     0x00000073: ("ecall", [], 0x00000073),
+    0x30200073: ("mret", [], 0x30200073),
+    0x00200073: ("uret", [], 0x00200073),
+    0x10200073: ("sret", [], 0x10200073),
+    0x10500073: ("wfi", [], 0x10500073),
 }