diff --git a/.gitignore b/.gitignore
index f4bb56b..ac3c110 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+./howto.sync.jekyll.submodules.txt
 _site
 _site/*
 .sass-cache
diff --git a/.gitmodules b/.gitmodules
index 3091109..21fa31a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,6 +4,3 @@
 [submodule "galyleo"]
 	path = galyleo
 	url = https://github.com/mkandes/galyleo
-[submodule "hpc-security"]
-	path = hpc-security
-	url = https://github.com/sdsc-hpc-training-org/hpc-security
diff --git a/hpc-security b/hpc-security
deleted file mode 160000
index 403baf5..0000000
--- a/hpc-security
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 403baf5b7553d52ef6a442c1824a1e3819eb2d19