diff --git a/.gitmodules b/.gitmodules
index 0d6a4041..7ff65fe1 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "submodules/rusty-http-cache-semantics"]
 	path = submodules/rusty-http-cache-semantics
 	url = git@github.com:junkurihara/rusty-http-cache-semantics.git
+[submodule "submodules/rustls-acme"]
+	path = submodules/rustls-acme
+	url = git@github.com:junkurihara/rustls-acme.git
diff --git a/rpxy-acme/Cargo.toml b/rpxy-acme/Cargo.toml
index 57dd5145..9473429c 100644
--- a/rpxy-acme/Cargo.toml
+++ b/rpxy-acme/Cargo.toml
@@ -26,6 +26,6 @@ rustls = { version = "0.23.11", default-features = false, features = [
   "aws_lc_rs",
 ] }
 rustls-platform-verifier = { version = "0.3.2" }
-rustls-acme = { path = "../../rustls-acme/", default-features = false, features = [
+rustls-acme = { path = "../submodules/rustls-acme/", default-features = false, features = [
   "aws-lc-rs",
 ] }
diff --git a/submodules/rustls-acme b/submodules/rustls-acme
new file mode 160000
index 00000000..43719fb0
--- /dev/null
+++ b/submodules/rustls-acme
@@ -0,0 +1 @@
+Subproject commit 43719fb04cc522c039c9e7420567a38416f9fec7