diff --git a/MODULE.bazel b/MODULE.bazel
index b013fb86e..82667a5b6 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -57,11 +57,6 @@ bazel_dep(
     version = "2025-11-05.bcr.1",
     repo_name = "com_googlesource_code_re2",
 )
-bazel_dep(
-    name = "flatbuffers",
-    version = "25.9.23",
-    repo_name = "com_github_google_flatbuffers",
-)
 bazel_dep(
     name = "cel-spec",
     version = "0.25.2",
diff --git a/tools/BUILD b/tools/BUILD
index af006a67b..8b6ba13d9 100644
--- a/tools/BUILD
+++ b/tools/BUILD
@@ -74,41 +74,6 @@ cc_test(
     ],
 )
 
-cc_library(
-    name = "flatbuffers_backed_impl",
-    srcs = [
-        "flatbuffers_backed_impl.cc",
-    ],
-    hdrs = [
-        "flatbuffers_backed_impl.h",
-    ],
-    deps = [
-        "//eval/public:cel_value",
-        "@com_github_google_flatbuffers//:flatbuffers",
-        "@com_google_absl//absl/status",
-        "@com_google_absl//absl/status:statusor",
-        "@com_google_absl//absl/strings",
-        "@com_google_absl//absl/types:optional",
-    ],
-)
-
-cc_test(
-    name = "flatbuffers_backed_impl_test",
-    size = "small",
-    srcs = [
-        "flatbuffers_backed_impl_test.cc",
-    ],
-    data = [
-        "//tools/testdata:flatbuffers_reflection_out",
-    ],
-    deps = [
-        ":flatbuffers_backed_impl",
-        "//internal:status_macros",
-        "//internal:testing",
-        "@com_github_google_flatbuffers//:flatbuffers",
-    ],
-)
-
 cc_library(
     name = "navigable_ast",
     srcs = ["navigable_ast.cc"],
diff --git a/tools/flatbuffers_backed_impl.h b/tools/flatbuffers_backed_impl.h
index 7051ef5d5..bf02436ad 100644
--- a/tools/flatbuffers_backed_impl.h
+++ b/tools/flatbuffers_backed_impl.h
@@ -9,6 +9,10 @@ namespace api {
 namespace expr {
 namespace runtime {
 
+// Reference implementation of CelMap backed by a flatbuffer table.
+//
+// To avoid taking a dependency on flatbuffers, this is not included in the
+// bazel module or built by public CI.
 class FlatBuffersMapImpl : public CelMap {
  public:
   FlatBuffersMapImpl(const flatbuffers::Table& table,
diff --git a/tools/testdata/BUILD b/tools/testdata/BUILD
index c88c9c478..f9d8ea4b9 100644
--- a/tools/testdata/BUILD
+++ b/tools/testdata/BUILD
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-load("@com_github_google_flatbuffers//:build_defs.bzl", "flatbuffer_library_public")
 load("@com_google_protobuf//bazel:cc_proto_library.bzl", "cc_proto_library")
 load("@com_google_protobuf//bazel:proto_library.bzl", "proto_library")
 load("@rules_cc//cc:cc_library.bzl", "cc_library")
@@ -21,14 +20,6 @@ licenses(["notice"])
 
 package(default_visibility = ["//visibility:public"])
 
-flatbuffer_library_public(
-    name = "flatbuffers_test",
-    srcs = ["flatbuffers.fbs"],
-    outs = ["flatbuffers_generated.h"],
-    language_flag = "-c",
-    reflection_name = "flatbuffers_reflection",
-)
-
 filegroup(
     name = "coverage_testdata",
     srcs = [
@@ -37,15 +28,6 @@ filegroup(
     ],
 )
 
-cc_library(
-    name = "flatbuffers_test_cc",
-    srcs = [":flatbuffers_test"],
-    hdrs = [":flatbuffers_test"],
-    features = ["-parse_headers"],
-    linkstatic = True,
-    deps = ["@com_github_google_flatbuffers//:runtime_cc"],
-)
-
 proto_library(
     name = "test_policy_proto",
     srcs = ["test_policy.proto"],