diff --git a/_sources/extensions/eo/schema.yaml b/_sources/extensions/eo/schema.yaml
index 2cd1605..b61bfe0 100644
--- a/_sources/extensions/eo/schema.yaml
+++ b/_sources/extensions/eo/schema.yaml
@@ -3,6 +3,6 @@ title: "Forecast Extension"
 description: "STAC Forecast Extension for STAC Items and STAC Collections."
 allOf:
   - anyOf:
-    - $ref: ../../collection/schema.yaml
-    - $ref: ../../item/schema.yaml
+    - $ref: bblocks://ogc.contrib.stac.collection
+    - $ref: bblocks://ogc.contrib.stac.item
   - $ref: https://stac-extensions.github.io/eo/v1.1.0/schema.json
diff --git a/_sources/extensions/raster/schema.yaml b/_sources/extensions/raster/schema.yaml
index fb6f3e9..1231495 100644
--- a/_sources/extensions/raster/schema.yaml
+++ b/_sources/extensions/raster/schema.yaml
@@ -3,6 +3,6 @@ title: "Forecast Extension"
 description: "STAC Forecast Extension for STAC Items and STAC Collections."
 allOf:
   - anyOf:
-    - $ref: ../../collection/schema.yaml
-    - $ref: ../../item/schema.yaml
+    - $ref: bblocks://ogc.contrib.stac.collection
+    - $ref: bblocks://ogc.contrib.stac.item
   - $ref: https://stac-extensions.github.io/raster/v1.1.0/schema.json
diff --git a/_sources/item-prov/schema.yaml b/_sources/item-prov/schema.yaml
index 59b0ef5..e486515 100644
--- a/_sources/item-prov/schema.yaml
+++ b/_sources/item-prov/schema.yaml
@@ -2,7 +2,7 @@
 description: 'STAC Collection'
 allOf:
   - $ref: bblocks://ogc.ogc-utils.prov#/$defs/Entity
-  - $ref: https://github.com/radiantearth/stac-spec/raw/master/item-spec/json-schema/item.json
+  - $ref: bblocks://ogc.contrib.stac.item
   - type: object
     properties:
       stac_extensions: