diff --git a/cel-c/BUILD b/cel-c/BUILD
index 3a3d7f5..9ab4544 100644
--- a/cel-c/BUILD
+++ b/cel-c/BUILD
@@ -360,7 +360,7 @@ cc_library(
     name = "constant_proto",
     srcs = ["constant_proto.cc"],
     hdrs = ["constant_proto.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":arena",
         ":assert",
@@ -405,7 +405,7 @@ cc_library(
     name = "constant_proto_v1alpha1",
     srcs = ["constant_proto_v1alpha1.cc"],
     hdrs = ["constant_proto_v1alpha1.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":arena",
         ":assert",
@@ -481,7 +481,7 @@ cc_library(
     hdrs = [
         "decl.h",
     ],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":arena",
         ":assert",
@@ -519,7 +519,7 @@ cc_library(
     hdrs = [
         "decl_proto.h",
     ],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":arena",
         ":assert",
@@ -566,7 +566,7 @@ cc_library(
     hdrs = [
         "decl_proto_v1alpha1.h",
     ],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":arena",
         ":assert",
@@ -634,7 +634,7 @@ cc_test(
 cc_library(
     name = "duration_absl",
     hdrs = ["duration_absl.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":config",
         ":duration",
@@ -661,7 +661,7 @@ cc_library(
     hdrs = [
         "duration_proto.h",
     ],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":assert",
         ":config",
@@ -725,7 +725,7 @@ cc_library(
     name = "error_absl",
     srcs = ["error_absl.cc"],
     hdrs = ["error_absl.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":assert",
         ":config",
@@ -762,7 +762,7 @@ cc_library(
     name = "error_proto",
     srcs = ["error_proto.cc"],
     hdrs = ["error_proto.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":arena",
         ":assert",
@@ -825,7 +825,7 @@ cc_test(
 cc_library(
     name = "error_code_absl",
     hdrs = ["error_code_absl.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":config",
         ":error_code",
@@ -847,7 +847,7 @@ cc_test(
 cc_library(
     name = "error_code_proto",
     hdrs = ["error_code_proto.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":config",
         ":error_code",
@@ -878,7 +878,7 @@ cc_library(
         "@platforms//os:linux": ["_GNU_SOURCE=1"],
         "//conditions:default": [],
     }),
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":assert",
         ":config",
@@ -906,7 +906,7 @@ cc_library(
     hdrs = [
         "error_status.h",
     ],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":arena",
         ":assert",
@@ -938,7 +938,7 @@ cc_test(
 cc_library(
     name = "function_scope",
     hdrs = ["function_scope.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":config",
     ],
@@ -1057,7 +1057,7 @@ cc_library(
 cc_library(
     name = "source",
     hdrs = ["source.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":config",
     ],
@@ -1089,7 +1089,7 @@ cc_library(
     hdrs = [
         "ref_proto.h",
     ],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":arena",
         ":assert",
@@ -1132,7 +1132,7 @@ cc_library(
     hdrs = [
         "ref_proto_v1alpha1.h",
     ],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":arena",
         ":assert",
@@ -1244,7 +1244,7 @@ cc_library(
     name = "status_proto",
     srcs = ["status_proto.cc"],
     hdrs = ["status_proto.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":assert",
         ":config",
@@ -1308,7 +1308,7 @@ cc_test(
 cc_library(
     name = "status_code_absl",
     hdrs = ["status_code_absl.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":config",
         ":status_code",
@@ -1330,7 +1330,7 @@ cc_test(
 cc_library(
     name = "status_code_proto",
     hdrs = ["status_code_proto.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":config",
         ":status_code",
@@ -1432,7 +1432,7 @@ cc_test(
 cc_library(
     name = "timestamp_absl",
     hdrs = ["timestamp_absl.h"],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":config",
         ":timestamp",
@@ -1459,7 +1459,7 @@ cc_library(
     hdrs = [
         "timestamp_proto.h",
     ],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":assert",
         ":config",
@@ -1551,7 +1551,7 @@ cc_library(
     hdrs = [
         "type_proto.h",
     ],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":arena",
         ":assert",
@@ -1591,7 +1591,7 @@ cc_library(
     hdrs = [
         "type_proto_v1alpha1.h",
     ],
-    visibility = [":friends"],
+    visibility = ["//visibility:private"],
     deps = [
         ":arena",
         ":assert",