diff --git a/src/substrait/__init__.py b/src/substrait/__init__.py
index b5413d0..7c1b41b 100644
--- a/src/substrait/__init__.py
+++ b/src/substrait/__init__.py
@@ -3,6 +3,6 @@
 except ImportError:
     pass
 
-__substrait_version__ = "0.48.0"
-__substrait_hash__ = "3dc77ae"
+__substrait_version__ = "0.49.0"
+__substrait_hash__ = "fcf0f76"
 __minimum_substrait_version__ = "0.30.0"
diff --git a/src/substrait/extensions/functions_arithmetic_decimal.yaml b/src/substrait/extensions/functions_arithmetic_decimal.yaml
index a0f93db..b62c634 100644
--- a/src/substrait/extensions/functions_arithmetic_decimal.yaml
+++ b/src/substrait/extensions/functions_arithmetic_decimal.yaml
@@ -102,6 +102,15 @@ scalar_functions:
           scale_after_borrow = max(init_scale - delta, min_scale)
           scale = init_prec > 38 ? scale_after_borrow : init_scale
           DECIMAL<prec, scale>
+  - 
+    name: "abs"
+    description: Calculate the absolute value of the argument.
+    impls:
+      - args:
+          - name: x
+            value: decimal<P,S>
+        return: decimal<P,S>
+
 aggregate_functions:
   - name: "sum"
     description: Sum a set of values.
diff --git a/src/substrait/extensions/functions_comparison.yaml b/src/substrait/extensions/functions_comparison.yaml
index 6b6ad61..dffc572 100644
--- a/src/substrait/extensions/functions_comparison.yaml
+++ b/src/substrait/extensions/functions_comparison.yaml
@@ -50,6 +50,24 @@ scalar_functions:
         return: boolean
         nullability: DECLARED_OUTPUT
   -
+    name: "is_distinct_from"
+    description: >
+      Whether two values are not equal.
+
+      This function treats `null` values as comparable, so
+
+      `is_distinct_from(null, null) == False`
+
+      This is in contrast to `equal`, in which `null` values do not compare.
+    impls:
+      - args:
+          - value: any1
+            name: x
+          - value: any1
+            name: y
+        return: boolean
+        nullability: DECLARED_OUTPUT
+  -
     name: "lt"
     description: >
       Less than.
diff --git a/third_party/substrait b/third_party/substrait
index 3dc77ae..fcf0f76 160000
--- a/third_party/substrait
+++ b/third_party/substrait
@@ -1 +1 @@
-Subproject commit 3dc77aeca820eba70ba141bf3afa5e4c5ba055b9
+Subproject commit fcf0f762a3d39eabadf2f2b507ff803aadcb123e