diff --git a/VERSION b/VERSION
index 3ba5134..b9c0a67 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.491
+1.0.492
diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 82c8cbc..147f502 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -3957,22 +3957,32 @@
 # and FILLOBSM1,FILLOBSM2,FILLOBSM3,FILLOBSM4
 
 # Use the obstruction types for fill block on individual layers
- layer obsactive FILLOBSFOM,FILLOBSPOLY
+ templayer obspoly FILLOBSPOLY
+ and-not POLY
+
+ layer obsactive FILLOBSFOM
+ and-not DIFF,TAP
+ or obspoly
  labels FILLOBSFOM,FILLOBSPOLY
 
  layer obsm1 FILLOBSM1
+ and-not MET1
  labels FILLOBSM1
 
  layer obsm2 FILLOBSM2
+ and-not MET2
  labels FILLOBSM2
 
  layer obsm3 FILLOBSM3
+ and-not MET3
  labels FILLOBSM3
 
  layer obsm4 FILLOBSM4
+ and-not MET4
  labels FILLOBSM4
 
  layer obsm5 FILLOBSM5
+ and-not MET5
  labels FILLOBSM5
 
 # MOS Varactor