diff --git a/pyproject.toml b/pyproject.toml
index 8e6f7f1..3e7631b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ Repository = "https://github.com/angr/archinfo"
 
 [project.optional-dependencies]
 pcode = [
-    "pypcode>=1.1",
+    "pypcode~=4.0",
 ]
 
 [dependency-groups]