diff --git a/Cargo.lock b/Cargo.lock
index ea4f2adda..07c029eeb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -73,7 +73,7 @@ checksum = "366ffbaa4442f4684d91e2cd7c5ea7c4ed8add41959a31447066e279e432b618"
 [[package]]
 name = "acadrust"
 version = "0.4.0"
-source = "git+https://github.com/HakanSeven12/acadrust?branch=main#d1e198b66db8a460915d7ebcdb293e912d7bf964"
+source = "git+https://github.com/OpenAEC-Foundation/acadifc?branch=main#a7f4741eb9dbcc8f44170eca3a5c85143b6cf432"
 dependencies = [
  "ahash 0.8.12",
  "anyhow",
@@ -3178,7 +3178,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b577e2d69827c4740cba2b52efaad1c4cc7c73042860b199710b3575c68438d"
 dependencies = [
  "bytecount",
- "memchr 1.0.2",
+ "memchr 2.8.2",
  "nom 8.0.0",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index e27e5b0c9..d4a73d53d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -89,10 +89,11 @@ lyon_tessellation = "1.0.20"
 windows-sys = { version = "0.61", features = ["Win32_UI_Shell", "Win32_UI_WindowsAndMessaging", "Win32_System_Com", "Win32_System_Registry", "Win32_Foundation"] }
 
 [patch.crates-io]
-# Tracks HakanSeven12/acadrust main (0.4.x): the plotstyle/material common-
-# entity ordering fix plus the in-flight DWG reader work, ahead of the crates.io
-# release. Drop the patch once those land in a published 0.4 crate.
-acadrust = { git = "https://github.com/HakanSeven12/acadrust", branch = "main" }
+# The `acadrust` crate now tracks the OpenAEC-Foundation/acadifc fork's main
+# (still the `acadrust` package): the in-flight DWG reader work plus the Arc
+# copy-on-write entity storage that makes the undo document clone cheap. Drop the
+# patch once these land in a published 0.4 crate.
+acadrust = { git = "https://github.com/OpenAEC-Foundation/acadifc", branch = "main" }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 # Native enables the plugin host runtime (out-of-process plugins).