diff --git a/src/substrait/__init__.py b/src/substrait/__init__.py
index f791f09..b5413d0 100644
--- a/src/substrait/__init__.py
+++ b/src/substrait/__init__.py
@@ -3,6 +3,6 @@
 except ImportError:
     pass
 
-__substrait_version__ = "0.47.0"
-__substrait_hash__ = "9cba028"
+__substrait_version__ = "0.48.0"
+__substrait_hash__ = "3dc77ae"
 __minimum_substrait_version__ = "0.30.0"
diff --git a/src/substrait/extensions/functions_arithmetic.yaml b/src/substrait/extensions/functions_arithmetic.yaml
index f58d834..050af65 100644
--- a/src/substrait/extensions/functions_arithmetic.yaml
+++ b/src/substrait/extensions/functions_arithmetic.yaml
@@ -1214,20 +1214,6 @@ aggregate_functions:
         decomposable: MANY
         intermediate: fp64?
         return: fp64?
-      - args:
-          - name: x
-            value: timestamp
-        nullability: DECLARED_OUTPUT
-        decomposable: MANY
-        intermediate: timestamp?
-        return: timestamp?
-      - args:
-          - name: x
-            value: timestamp_tz
-        nullability: DECLARED_OUTPUT
-        decomposable: MANY
-        intermediate: timestamp_tz?
-        return: timestamp_tz?
   - name: "max"
     description: Max a set of values.
     impls:
@@ -1273,20 +1259,6 @@ aggregate_functions:
         decomposable: MANY
         intermediate: fp64?
         return: fp64?
-      - args:
-          - name: x
-            value: timestamp
-        nullability: DECLARED_OUTPUT
-        decomposable: MANY
-        intermediate: timestamp?
-        return: timestamp?
-      - args:
-          - name: x
-            value: timestamp_tz
-        nullability: DECLARED_OUTPUT
-        decomposable: MANY
-        intermediate: timestamp_tz?
-        return: timestamp_tz?
   - name: "product"
     description: Product of a set of values. Returns 1 for empty input.
     impls:
diff --git a/third_party/substrait b/third_party/substrait
index 9cba028..3dc77ae 160000
--- a/third_party/substrait
+++ b/third_party/substrait
@@ -1 +1 @@
-Subproject commit 9cba028a1e04ee743f27d9d4e1578597bcea1c10
+Subproject commit 3dc77aeca820eba70ba141bf3afa5e4c5ba055b9