diff --git a/.gitmodules b/.gitmodules
index 50feef43bb..51f1c4976b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -16,9 +16,6 @@
 [submodule "Dev/Cpp/3rdParty/stb"]
 	path = Dev/Cpp/3rdParty/stb
 	url = https://github.com/nothings/stb.git
-[submodule "Dev/Cpp/3rdParty/AltseedRHI"]
-	path = Dev/Cpp/3rdParty/AltseedRHI
-	url = https://github.com/altseed/AltseedRHI.git
 [submodule "TestData"]
 	path = TestData
 	url = https://github.com/effekseer/TestData.git
diff --git a/Dev/Cpp/3rdParty/AltseedRHI b/Dev/Cpp/3rdParty/AltseedRHI
deleted file mode 160000
index 3eb5de610c..0000000000
--- a/Dev/Cpp/3rdParty/AltseedRHI
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 3eb5de610c7925e6a8685d085900529a6cbd895d