diff --git a/common/ast_rewrite.cc b/common/ast_rewrite.cc
index 14582f44f..b61e1fab6 100644
--- a/common/ast_rewrite.cc
+++ b/common/ast_rewrite.cc
@@ -54,7 +54,7 @@ struct ExprRecord {
 };
 
 using StackRecordKind =
-    absl::variant<ExprRecord, ArgRecord, ComprehensionRecord>;
+    std::variant<ExprRecord, ArgRecord, ComprehensionRecord>;
 
 struct StackRecord {
  public:
diff --git a/common/ast_traverse.cc b/common/ast_traverse.cc
index a6ba0d1ba..fb4f9731e 100644
--- a/common/ast_traverse.cc
+++ b/common/ast_traverse.cc
@@ -53,7 +53,7 @@ struct ExprRecord {
 };
 
 using StackRecordKind =
-    absl::variant<ExprRecord, ArgRecord, ComprehensionRecord>;
+    std::variant<ExprRecord, ArgRecord, ComprehensionRecord>;
 
 struct StackRecord {
  public:
diff --git a/common/decl_proto.cc b/common/decl_proto.cc
index 89f7f4453..098c5068c 100644
--- a/common/decl_proto.cc
+++ b/common/decl_proto.cc
@@ -69,7 +69,7 @@ absl::StatusOr<FunctionDecl> FunctionDeclFromProto(
   return decl;
 }
 
-absl::StatusOr<absl::variant<VariableDecl, FunctionDecl>> DeclFromProto(
+absl::StatusOr<std::variant<VariableDecl, FunctionDecl>> DeclFromProto(
     const cel::expr::Decl& decl,
     const google::protobuf::DescriptorPool* absl_nonnull descriptor_pool,
     google::protobuf::Arena* absl_nonnull arena) {
diff --git a/common/decl_proto_test.cc b/common/decl_proto_test.cc
index 62215f07f..d72d97e09 100644
--- a/common/decl_proto_test.cc
+++ b/common/decl_proto_test.cc
@@ -49,7 +49,7 @@ TEST_P(DeclFromProtoTest, FromProtoWorks) {
   cel::expr::Decl decl_pb;
   ASSERT_TRUE(
       google::protobuf::TextFormat::ParseFromString(test_case.proto_decl, &decl_pb));
-  absl::StatusOr<absl::variant<VariableDecl, FunctionDecl>> decl_or =
+  absl::StatusOr<std::variant<VariableDecl, FunctionDecl>> decl_or =
       DeclFromProto(decl_pb, descriptor_pool, &arena);
   switch (test_case.decl_type) {
     case DeclType::kVariable: {
@@ -79,7 +79,7 @@ TEST_P(DeclFromProtoTest, FromV1Alpha1ProtoWorks) {
   google::api::expr::v1alpha1::Decl decl_pb;
   ASSERT_TRUE(
       google::protobuf::TextFormat::ParseFromString(test_case.proto_decl, &decl_pb));
-  absl::StatusOr<absl::variant<VariableDecl, FunctionDecl>> decl_or =
+  absl::StatusOr<std::variant<VariableDecl, FunctionDecl>> decl_or =
       DeclFromV1Alpha1Proto(decl_pb, descriptor_pool, &arena);
   switch (test_case.decl_type) {
     case DeclType::kVariable: {
diff --git a/common/decl_proto_v1alpha1.cc b/common/decl_proto_v1alpha1.cc
index 2c6cfb6e4..a8d73e5c2 100644
--- a/common/decl_proto_v1alpha1.cc
+++ b/common/decl_proto_v1alpha1.cc
@@ -52,7 +52,7 @@ absl::StatusOr<FunctionDecl> FunctionDeclFromV1Alpha1Proto(
   return FunctionDeclFromProto(name, unversioned, descriptor_pool, arena);
 }
 
-absl::StatusOr<absl::variant<VariableDecl, FunctionDecl>> DeclFromV1Alpha1Proto(
+absl::StatusOr<std::variant<VariableDecl, FunctionDecl>> DeclFromV1Alpha1Proto(
     const google::api::expr::v1alpha1::Decl& decl,
     const google::protobuf::DescriptorPool* absl_nonnull descriptor_pool,
     google::protobuf::Arena* absl_nonnull arena) {
diff --git a/common/type.cc b/common/type.cc
index ce8c7a89a..f94e8bc52 100644
--- a/common/type.cc
+++ b/common/type.cc
@@ -97,7 +97,7 @@ static constexpr std::array<TypeKind, 28> kTypeToKindArray = {
     TypeKind::kUnknown};
 
 static_assert(kTypeToKindArray.size() ==
-                  absl::variant_size<common_internal::TypeVariant>(),
+                  std::variant_size<common_internal::TypeVariant>(),
               "Kind indexer must match variant declaration for cel::Type.");
 
 }  // namespace