diff --git a/.gitmodules b/.gitmodules
index 132c7a9f7..81ed2d5f4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -20,9 +20,3 @@
 [submodule "addins/coremark"]
 	path = addins/coremark
 	url = https://github.com/eembc/coremark
-[submodule "addins/sky130_osu_sc_t18"]
-	path = addins/sky130_osu_sc_t18
-	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_osu_sc_t18
-[submodule "addins/sky130_osu_sc_t12"]
-	path = addins/sky130_osu_sc_t12
-	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_osu_sc_t12
diff --git a/addins/sky130_osu_sc_t12 b/addins/sky130_osu_sc_t12
deleted file mode 160000
index f1eef8447..000000000
--- a/addins/sky130_osu_sc_t12
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit f1eef844734f73d3c79d83b82352118263eb7686
diff --git a/addins/sky130_osu_sc_t18 b/addins/sky130_osu_sc_t18
deleted file mode 160000
index 83f5245e1..000000000
--- a/addins/sky130_osu_sc_t18
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 83f5245e1a599c628d6c73e76c1774b8ab5cab91