diff --git a/.gitmodules b/.gitmodules
index fc993b6..f76fc05 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,9 +7,6 @@
 [submodule "book/external/deploy-book-workflow"]
 	path = book/external/deploy-book-workflow
 	url = https://github.com/TeachBooks/deploy-book-workflow.git
-[submodule "book/external/latex-to-markdown-conversion"]
-	path = book/external/latex-to-markdown-conversion
-	url = https://gitlab.tudelft.nl/opentextbooks/latex-to-markdown-conversion.git
 [submodule "book/external/Useful_python_code"]
 	path = book/external/Useful_python_code
 	url = https://github.com/TeachBooks/Useful_python_code.git
diff --git a/book/external/latex-to-markdown-conversion b/book/external/latex-to-markdown-conversion
deleted file mode 160000
index cb81691..0000000
--- a/book/external/latex-to-markdown-conversion
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit cb8169156e5c0150848cf52fb177d0d40934522e