diff --git a/VERSION b/VERSION
index 11fe8af..d9efb1f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.251
+1.0.252
diff --git a/sky130/Makefile.in b/sky130/Makefile.in
index 7a76c97..697fc50 100644
--- a/sky130/Makefile.in
+++ b/sky130/Makefile.in
@@ -1065,6 +1065,7 @@
 		-lef %l/latest/cells/*/*.lef \
 			exclude=*.magic.lef lefopts=-toplayer \
 			include=custom/sky130_fd_sc_hd/lef/sky130_ef*.lef \
+			filter=custom/scripts/fix_digital_lef.py \
 			annotate compile-only \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
@@ -1112,6 +1113,7 @@
 			sort=../common/sort_pdkfiles.py \
 		-lef %l/latest/cells/*/*.lef annotate compile-only \
 			exclude=*.magic.lef lefopts=-toplayer \
+			filter=custom/scripts/fix_digital_lef.py \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
 		-lib %l/latest/timing/*.lib custom/scripts/add_wireloads.py \
@@ -1190,6 +1192,7 @@
 			sort=../common/sort_pdkfiles.py \
 		-lef %l/latest/cells/*/*.lef annotate compile-only \
 			exclude=*.magic.lef lefopts=-toplayer \
+			filter=custom/scripts/fix_digital_lef.py \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
 		-lib %l/latest/timing/*.lib custom/scripts/add_wireloads.py \
@@ -1223,6 +1226,7 @@
 			sort=../common/sort_pdkfiles.py \
 		-lef %l/latest/cells/*/*.lef annotate compile-only \
 			exclude=*.magic.lef lefopts=-toplayer \
+			filter=custom/scripts/fix_digital_lef.py \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
 		-lib %l/latest/timing/*.lib custom/scripts/add_wireloads.py \
@@ -1253,6 +1257,7 @@
 			sort=../common/sort_pdkfiles.py \
 		-lef %l/latest/cells/*/*.lef annotate compile-only \
 			exclude=*.magic.lef lefopts=-toplayer \
+			filter=custom/scripts/fix_digital_lef.py \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
 		-lib %l/latest/timing/*.lib custom/scripts/add_wireloads.py \
@@ -1287,6 +1292,7 @@
 		-lib %l/latest/timing/*.lib custom/scripts/add_wireloads.py \
 		-gds %l/latest/cells/*/*.gds compile-only \
 			options=custom/scripts/gds_import_setup.tcl \
+			filter=custom/scripts/fix_digital_lef.py \
 			sort=../common/sort_pdkfiles.py \
 		-verilog %l/latest/models/*/*.v exclude=*.*.v compile-only \
 			rename=primitives filter=custom/scripts/inc_verilog.py \
diff --git a/sky130/custom/scripts/fix_digital_lef.py b/sky130/custom/scripts/fix_digital_lef.py
new file mode 100755
index 0000000..5af5fab
--- /dev/null
+++ b/sky130/custom/scripts/fix_digital_lef.py
@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+#
+# fix_digital_lef ---
+#
+# This script fixes the issue where the LEF files of the digital standard
+# cells used to annotate the GDS for generation of new LEF files from
+# magic do not have VNB and VPB pins.  This script adds the annotation
+# for port use and port direction.
+#
+# 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.
+
+import re
+import os
+import sys
+
+def filter(inname, outname):
+
+    # Read input
+    try:
+        with open(inname, 'r') as inFile:
+            ltext = inFile.read()
+            llines = ltext.splitlines()
+    except:
+        print('fix_digital_lef.py: failed to open ' + fnmIn + ' for reading.', file=sys.stderr)
+        return 1
+
+    # Process input with regexp
+
+    fixedlines = []
+    modified = False
+
+    endrex = re.compile('[ \t]*END[ \t]+VGND')
+
+    for line in llines:
+        fixedlines.append(line)
+
+        # Check for end of VGND pin in file
+        ematch = endrex.match(line)
+        if ematch:
+            fixedlines.append('  PIN VNB')
+            fixedlines.append('    DIRECTION INOUT ;')
+            fixedlines.append('    USE GROUND ;')
+            fixedlines.append('    PORT')
+            fixedlines.append('    END')
+            fixedlines.append('  END VNB')
+            fixedlines.append('  PIN VPB')
+            fixedlines.append('    DIRECTION INOUT ;')
+            fixedlines.append('    USE POWER ;')
+            fixedlines.append('    PORT')
+            fixedlines.append('    END')
+            fixedlines.append('  END VPB')
+            modified = True
+
+    # Write output
+    if outname == None:
+        for i in fixedlines:
+            print(i)
+    else:
+        # If the output is a symbolic link but no modifications have been made,
+        # then leave it alone.  If it was modified, then remove the symbolic
+        # link before writing.
+        if os.path.islink(outname):
+            if not modified:
+                return 0
+            else:
+                os.unlink(outname)
+        try:
+            with open(outname, 'w') as outFile:
+                for i in fixedlines:
+                    print(i, file=outFile)
+        except:
+            print('fix_digital_lef.py: failed to open ' + outname + ' for writing.', file=sys.stderr)
+            return 1
+
+
+if __name__ == '__main__':
+
+    # This script expects to get one or two arguments.  One argument is
+    # mandatory and is the input file.  The other argument is optional and
+    # is the output file.  The output file and input file may be the same
+    # name, in which case the original input is overwritten.
+
+    options = []
+    arguments = []
+    for item in sys.argv[1:]:
+        if item.find('-', 0) == 0:
+            options.append(item[1:])
+        else:
+            arguments.append(item)
+
+    if len(arguments) > 0:
+        infilename = arguments[0]
+
+    if len(arguments) > 1:
+        outfilename = arguments[1]
+    else:
+        outfilename = None
+
+    result = filter(infilename, outfilename)
+    sys.exit(result)