diff --git a/.gitmodules b/.gitmodules
index cc709d8..64330e4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,55 @@
+# sky130_fd_pr
+[submodule "libraries/sky130_fd_pr/latest"]
+	path = libraries/sky130_fd_pr/latest
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+	branch = master
+	shallow = true
+[submodule "libraries/sky130_fd_pr/v0.20.1"]
+	path = libraries/sky130_fd_pr/v0.20.1
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+	branch = branch-0.20.1
+	shallow = true
+[submodule "libraries/sky130_fd_pr/v0.20.0"]
+	path = libraries/sky130_fd_pr/v0.20.0
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+	branch = branch-0.20.0
+	shallow = true
+[submodule "libraries/sky130_fd_pr/v0.13.0"]
+	path = libraries/sky130_fd_pr/v0.13.0
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+	branch = branch-0.13.0
+	shallow = true
+[submodule "libraries/sky130_fd_pr/v0.12.1"]
+	path = libraries/sky130_fd_pr/v0.12.1
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+	branch = branch-0.12.1
+	shallow = true
+[submodule "libraries/sky130_fd_pr/v0.12.0"]
+	path = libraries/sky130_fd_pr/v0.12.0
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+	branch = branch-0.12.0
+	shallow = true
+[submodule "libraries/sky130_fd_pr/v0.11.0"]
+	path = libraries/sky130_fd_pr/v0.11.0
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+	branch = branch-0.11.0
+	shallow = true
+[submodule "libraries/sky130_fd_pr/v0.10.1"]
+	path = libraries/sky130_fd_pr/v0.10.1
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+	branch = branch-0.10.1
+	shallow = true
+[submodule "libraries/sky130_fd_pr/v0.10.0"]
+	path = libraries/sky130_fd_pr/v0.10.0
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+	branch = branch-0.10.0
+	shallow = true
+[submodule "libraries/sky130_fd_pr/v0.0.9"]
+	path = libraries/sky130_fd_pr/v0.0.9
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+	branch = branch-0.0.9
+	shallow = true
+
 # sky130_fd_sc_hd
 [submodule "libraries/sky130_fd_sc_hd/latest"]
 	path = libraries/sky130_fd_sc_hd/latest
@@ -94,3 +146,30 @@
 	branch = branch-0.1.0
 	shallow = true
 	fetchRecurseSubmodules = false
+[submodule "libraries/sky130_fd_pr/0.0.9"]
+	path = libraries/sky130_fd_pr/0.0.9
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+[submodule "libraries/sky130_fd_pr/0.10.0"]
+	path = libraries/sky130_fd_pr/0.10.0
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+[submodule "libraries/sky130_fd_pr/0.10.1"]
+	path = libraries/sky130_fd_pr/0.10.1
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+[submodule "libraries/sky130_fd_pr/0.11.0"]
+	path = libraries/sky130_fd_pr/0.11.0
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+[submodule "libraries/sky130_fd_pr/0.12.0"]
+	path = libraries/sky130_fd_pr/0.12.0
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+[submodule "libraries/sky130_fd_pr/0.12.1"]
+	path = libraries/sky130_fd_pr/0.12.1
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+[submodule "libraries/sky130_fd_pr/0.13.0"]
+	path = libraries/sky130_fd_pr/0.13.0
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+[submodule "libraries/sky130_fd_pr/0.20.0"]
+	path = libraries/sky130_fd_pr/0.20.0
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
+[submodule "libraries/sky130_fd_pr/0.20.1"]
+	path = libraries/sky130_fd_pr/0.20.1
+	url = https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_fd_pr.git
diff --git a/libraries/sky130_fd_pr/0.0.9 b/libraries/sky130_fd_pr/0.0.9
new file mode 160000
index 0000000..d717cd4
--- /dev/null
+++ b/libraries/sky130_fd_pr/0.0.9
@@ -0,0 +1 @@
+Subproject commit d717cd4d8d93cce6a8d7534f6a40432f0045039f
diff --git a/libraries/sky130_fd_pr/0.10.0 b/libraries/sky130_fd_pr/0.10.0
new file mode 160000
index 0000000..d717cd4
--- /dev/null
+++ b/libraries/sky130_fd_pr/0.10.0
@@ -0,0 +1 @@
+Subproject commit d717cd4d8d93cce6a8d7534f6a40432f0045039f
diff --git a/libraries/sky130_fd_pr/0.10.1 b/libraries/sky130_fd_pr/0.10.1
new file mode 160000
index 0000000..d717cd4
--- /dev/null
+++ b/libraries/sky130_fd_pr/0.10.1
@@ -0,0 +1 @@
+Subproject commit d717cd4d8d93cce6a8d7534f6a40432f0045039f
diff --git a/libraries/sky130_fd_pr/0.11.0 b/libraries/sky130_fd_pr/0.11.0
new file mode 160000
index 0000000..d717cd4
--- /dev/null
+++ b/libraries/sky130_fd_pr/0.11.0
@@ -0,0 +1 @@
+Subproject commit d717cd4d8d93cce6a8d7534f6a40432f0045039f
diff --git a/libraries/sky130_fd_pr/0.12.0 b/libraries/sky130_fd_pr/0.12.0
new file mode 160000
index 0000000..d717cd4
--- /dev/null
+++ b/libraries/sky130_fd_pr/0.12.0
@@ -0,0 +1 @@
+Subproject commit d717cd4d8d93cce6a8d7534f6a40432f0045039f
diff --git a/libraries/sky130_fd_pr/0.12.1 b/libraries/sky130_fd_pr/0.12.1
new file mode 160000
index 0000000..d717cd4
--- /dev/null
+++ b/libraries/sky130_fd_pr/0.12.1
@@ -0,0 +1 @@
+Subproject commit d717cd4d8d93cce6a8d7534f6a40432f0045039f
diff --git a/libraries/sky130_fd_pr/0.13.0 b/libraries/sky130_fd_pr/0.13.0
new file mode 160000
index 0000000..d717cd4
--- /dev/null
+++ b/libraries/sky130_fd_pr/0.13.0
@@ -0,0 +1 @@
+Subproject commit d717cd4d8d93cce6a8d7534f6a40432f0045039f
diff --git a/libraries/sky130_fd_pr/0.20.0 b/libraries/sky130_fd_pr/0.20.0
new file mode 160000
index 0000000..d717cd4
--- /dev/null
+++ b/libraries/sky130_fd_pr/0.20.0
@@ -0,0 +1 @@
+Subproject commit d717cd4d8d93cce6a8d7534f6a40432f0045039f
diff --git a/libraries/sky130_fd_pr/0.20.1 b/libraries/sky130_fd_pr/0.20.1
new file mode 160000
index 0000000..d717cd4
--- /dev/null
+++ b/libraries/sky130_fd_pr/0.20.1
@@ -0,0 +1 @@
+Subproject commit d717cd4d8d93cce6a8d7534f6a40432f0045039f
diff --git a/libraries/sky130_fd_pr/latest b/libraries/sky130_fd_pr/latest
new file mode 160000
index 0000000..d717cd4
--- /dev/null
+++ b/libraries/sky130_fd_pr/latest
@@ -0,0 +1 @@
+Subproject commit d717cd4d8d93cce6a8d7534f6a40432f0045039f