diff --git a/.gitmodules b/.gitmodules
index 22f34ffd0..65e1e71c9 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,9 +1,3 @@
 [submodule "sky130/sky130_osu_sc_t12"]
 	path = sky130/sky130_osu_sc_t12
 	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_osu_sc_t12/
-[submodule "sky130/sky130_osu_sc_t15"]
-	path = sky130/sky130_osu_sc_t15
-	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_osu_sc_t15/
-[submodule "sky130/sky130_osu_sc_t18"]
-	path = sky130/sky130_osu_sc_t18
-	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_osu_sc_t18/
diff --git a/sky130/sky130_osu_sc_t15 b/sky130/sky130_osu_sc_t15
deleted file mode 160000
index dae3c2282..000000000
--- a/sky130/sky130_osu_sc_t15
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit dae3c2282e10d72f57af61d1dd73a1b0aead63f9
diff --git a/sky130/sky130_osu_sc_t18 b/sky130/sky130_osu_sc_t18
deleted file mode 160000
index 6c20402bf..000000000
--- a/sky130/sky130_osu_sc_t18
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 6c20402bf853e6bf3985fce49fe88ca25502cc63