diff --git a/CHANGES.md b/CHANGES.md
index 44ba69860..be759c9e7 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,9 +4,21 @@
 
 ### Changed
 
+- move `transaction` clients and models to `stac_fastapi.extension` sub-module
 - Add Item and Collection `PATCH` endpoints with support for [RFC 6902](https://tools.ietf.org/html/rfc6902) and [RFC 7396](https://tools.ietf.org/html/rfc7386) in the `TransactionExtension`
 - remove support of `cql-json` in Filter extension ([#840](https://github.com/stac-utils/stac-fastapi/pull/840))
-- move `transaction` clients and models to `stac_fastapi.extension` sub-module
+- rename filter extension `FilterConformanceClasses` values and change the URLs:
+  - `BASIC_SPATIAL_OPERATORS` -> `BASIC_SPATIAL_FUNCTIONS`
+  - `TEMPORAL_OPERATORS` -> `TEMPORAL_FUNCTIONS`
+  - `SPATIAL_OPERATORS` -> `SPATIAL_FUNCTIONS`
+  - `ARRAYS` -> `ARRAY_FUNCTIONS`
+  - `ACCENT_CASE_INSENSITIVE_COMPARISON` -> `CASE_INSENSITIVE_COMPARISON`
+
+### Added
+
+- add new values to filter extension `FilterConformanceClasses`
+  - `ACCENT_INSENSITIVE_COMPARISON`
+  - `BASIC_SPATIAL_FUNCTIONS_PLUS`
 
 ### Fixed
 
diff --git a/stac_fastapi/extensions/stac_fastapi/extensions/core/filter/filter.py b/stac_fastapi/extensions/stac_fastapi/extensions/core/filter/filter.py
index 7e8d7f57c..c967755bb 100644
--- a/stac_fastapi/extensions/stac_fastapi/extensions/core/filter/filter.py
+++ b/stac_fastapi/extensions/stac_fastapi/extensions/core/filter/filter.py
@@ -31,20 +31,26 @@ class FilterConformanceClasses(str, Enum):
     CQL2_TEXT = "http://www.opengis.net/spec/cql2/1.0/conf/cql2-text"
     CQL2_JSON = "http://www.opengis.net/spec/cql2/1.0/conf/cql2-json"
     BASIC_CQL2 = "http://www.opengis.net/spec/cql2/1.0/conf/basic-cql2"
-    BASIC_SPATIAL_OPERATORS = (
-        "http://www.opengis.net/spec/cql2/1.0/conf/basic-spatial-operators"
+    BASIC_SPATIAL_FUNCTIONS = (
+        "http://www.opengis.net/spec/cql2/1.0/conf/basic-spatial-functions"
     )
-    TEMPORAL_OPERATORS = " http://www.opengis.net/spec/cql2/1.0/conf/temporal-operators"
+    TEMPORAL_FUNCTIONS = "http://www.opengis.net/spec/cql2/1.0/conf/temporal-functions"
     ADVANCED_COMPARISON_OPERATORS = (
         "http://www.opengis.net/spec/cql2/1.0/conf/advanced-comparison-operators"
     )
-    SPATIAL_OPERATORS = "http://www.opengis.net/spec/cql2/1.0/conf/spatial-operators"
+    SPATIAL_FUNCTIONS = "http://www.opengis.net/spec/cql2/1.0/conf/spatial-functions"
     FUNCTIONS = "http://www.opengis.net/spec/cql2/1.0/conf/functions"
     ARITHMETIC = "http://www.opengis.net/spec/cql2/1.0/conf/arithmetic"
-    ARRAYS = "http://www.opengis.net/spec/cql2/1.0/conf/array-operators"
+    ARRAY_FUNCTIONS = "http://www.opengis.net/spec/cql2/1.0/conf/array-functions"
     PROPERTY_PROPERTY = "http://www.opengis.net/spec/cql2/1.0/conf/property-property"
-    ACCENT_CASE_INSENSITIVE_COMPARISON = (
-        "http://www.opengis.net/spec/cql2/1.0/conf/accent-case-insensitive-comparison"
+    CASE_INSENSITIVE_COMPARISON = (
+        "http://www.opengis.net/spec/cql2/1.0/conf/case-insensitive-comparison"
+    )
+    ACCENT_INSENSITIVE_COMPARISON = (
+        "http://www.opengis.net/spec/cql2/1.0/conf/accent-insensitive-comparison"
+    )
+    BASIC_SPATIAL_FUNCTIONS_PLUS = (
+        "http://www.opengis.net/spec/cql2/1.0/conf/basic-spatial-functions-plus"
     )