diff --git a/gf180mcu/gf180mcu.json b/gf180mcu/gf180mcu.json
index 9b5a2a8..c385026 100644
--- a/gf180mcu/gf180mcu.json
+++ b/gf180mcu/gf180mcu.json
@@ -84,12 +84,12 @@
 	"magic": "MAGIC_COMMIT"
     }
     "reference": {
-        "open_pdks": "fb6f374beff316f9a8e0b5585facfc18008c0f2d",
+        "open_pdks": "cc0029b45c68137aa21323912f50d2fc17eeea13",
         "magic": "43d5cc280413b0fd947b555bf1e8d79ea8681450",
-        "gf180mcu_fd_pr": "92ec4b2e5eb193a0c5c2754413d44981c8e17e16",
-        "gf180mcu_fd_io": "5cc533968c9d03972f92a461af0edc80118b1e9c",
-        "gf180mcu_fd_sc_mcu7t5v0": "1f37f62c329b62710f4331d68272beeae20140e5",
-        "gf180mcu_fd_sc_mcu9t5v0": "1f37f62c329b62710f4331d68272beeae20140e5",
-        "gf180mcu_fd_ip_sram": "343ab45497682f3f3f808ee4c79a8f92c5010636"
+        "gf180mcu_fd_pr": "cc0029b45c68137aa21323912f50d2fc17eeea13",
+        "gf180mcu_fd_io": "cc0029b45c68137aa21323912f50d2fc17eeea13",
+        "gf180mcu_fd_sc_mcu7t5v0": "cc0029b45c68137aa21323912f50d2fc17eeea13",
+        "gf180mcu_fd_sc_mcu9t5v0": "cc0029b45c68137aa21323912f50d2fc17eeea13",
+        "gf180mcu_fd_ip_sram": "cc0029b45c68137aa21323912f50d2fc17eeea13"
     }
 }
diff --git a/sky130/custom/scripts/fix_digital_lef.py b/sky130/custom/scripts/fix_digital_lef.py
index 417a949..d0d13e0 100755
--- a/sky130/custom/scripts/fix_digital_lef.py
+++ b/sky130/custom/scripts/fix_digital_lef.py
@@ -7,6 +7,10 @@
 # magic do not have VNB and VPB pins.  This script adds the annotation
 # for port use and port direction.
 #
+# (Added 8/11/2022) The script also reclassifies the antenna diode cell
+# as core sub-type ANTENNACELL, which the original standard cell LEF
+# views fail to do.
+#
 # This script is a filter to be run by setting the name of this script as
 # the value to "filter=" for the model install in the sky130 Makefile.
 
@@ -31,8 +35,24 @@
     modified = False
 
     endrex = re.compile('[ \t]*END[ \t]+VGND')
+    macrorex = re.compile('^MACRO[ \t]+([^ \t\n]+)')
+    classrex = re.compile('^[ \t]*CLASS')
+    macroname = None
 
     for line in llines:
+
+        # Check for MACRO line and record the macro name
+        mmatch = macrorex.match(line)
+        if mmatch:
+            macroname = mmatch.group(1)
+
+        # Check for "CLASS" related to "DIODE"
+        cmatch = classrex.match(line)
+        if cmatch and macroname:
+            if '__diode_' in macroname:
+                line = '  CLASS CORE ANTENNACELL ;'
+                modified = True
+
         fixedlines.append(line)
 
         # Check for end of VGND pin in file
@@ -51,6 +71,7 @@
             fixedlines.append('    END')
             fixedlines.append('  END VPB')
             modified = True
+            macroname = None
 
     # Write output
     if outname == None:
diff --git a/sky130/sky130.json b/sky130/sky130.json
index 6dc1a66..081668e 100644
--- a/sky130/sky130.json
+++ b/sky130/sky130.json
@@ -92,7 +92,7 @@
         "magic": "MAGIC_COMMIT"
     },
     "reference": {
-        "open_pdks": "fb6f374beff316f9a8e0b5585facfc18008c0f2d",
+        "open_pdks": "cc0029b45c68137aa21323912f50d2fc17eeea13",
         "magic": "43d5cc280413b0fd947b555bf1e8d79ea8681450",
         "skywater_pdk": "f70d8ca46961ff92719d8870a18a076370b85f6c",
         "sky130_osu_sc_t12": "ac90ef0c622a9377a16b5218d9da3ac4169eeaaf",