diff --git a/BUILD.bazel b/BUILD.bazel
index de0ff7145..ea8ffae21 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -30,8 +30,10 @@ cc_library(
         "include/nlohmann/detail/input/input_adapters.hpp",
         "include/nlohmann/detail/input/json_sax.hpp",
         "include/nlohmann/detail/input/lexer.hpp",
+        "include/nlohmann/detail/input/number_parse.hpp",
         "include/nlohmann/detail/input/parser.hpp",
         "include/nlohmann/detail/input/position_t.hpp",
+        "include/nlohmann/detail/input/string_scan.hpp",
         "include/nlohmann/detail/iterators/internal_iterator.hpp",
         "include/nlohmann/detail/iterators/iter_impl.hpp",
         "include/nlohmann/detail/iterators/iteration_proxy.hpp",
@@ -49,6 +51,7 @@ cc_library(
         "include/nlohmann/detail/meta/detected.hpp",
         "include/nlohmann/detail/meta/identity_tag.hpp",
         "include/nlohmann/detail/meta/is_sax.hpp",
+        "include/nlohmann/detail/meta/logic.hpp",
         "include/nlohmann/detail/meta/std_fs.hpp",
         "include/nlohmann/detail/meta/type_traits.hpp",
         "include/nlohmann/detail/meta/void_t.hpp",
diff --git a/FILES.md b/FILES.md
index b68167336..263647146 100644
--- a/FILES.md
+++ b/FILES.md
@@ -250,12 +250,16 @@ Further documentation:
 
 ### `BUILD.bazel`
 
-The file can be updated by calling
+The build definition for [Bazel](https://bazel.build). The file is generated by
+`cmake/scripts/gen_bazel_build_file.cmake`, which derives the header list from the files in `include`; change the
+script rather than editing the file by hand. The file can be updated by calling
 
 ```shell
 make BUILD.bazel
 ```
 
+The "Check amalgamation" workflow fails if the file is out of date.
+
 ### `meson.build`
 
 The build definition for the [Meson](https://mesonbuild.com) build system.
diff --git a/Makefile b/Makefile
index e1a1d2b75..871ea7995 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-.PHONY: pretty clean ChangeLog.md release update_hedley update_hedley_undef
+.PHONY: pretty clean ChangeLog.md release update_hedley update_hedley_undef BUILD.bazel
 
 ##########################################################################
 # configuration
@@ -30,8 +30,9 @@ AMALGAMATED_FWD_FILE=single_include/nlohmann/json_fwd.hpp
 # main target
 all:
 	@echo "amalgamate - amalgamate files single_include/nlohmann/json{,_fwd}.hpp from the include/nlohmann sources"
+	@echo "BUILD.bazel - regenerate the Bazel BUILD file from the include/nlohmann sources"
 	@echo "ChangeLog.md - generate ChangeLog file"
-	@echo "check-amalgamation - check whether sources have been amalgamated"
+	@echo "check-amalgamation - check whether sources have been amalgamated and BUILD.bazel is up to date"
 	@echo "clean - remove built files"
 	@echo "doctest - compile example files and check their output"
 	@echo "fuzz_testing - prepare fuzz testing of the JSON parser"
@@ -172,8 +173,13 @@ check-amalgamation:
 	@diff $(AMALGAMATED_FWD_FILE) $(AMALGAMATED_FWD_FILE)~ || (echo "===================================================================\n  Amalgamation required! Please read the contribution guidelines\n  in file .github/CONTRIBUTING.md.\n===================================================================" ; mv $(AMALGAMATED_FWD_FILE)~ $(AMALGAMATED_FWD_FILE) ; false)
 	@mv $(AMALGAMATED_FILE)~ $(AMALGAMATED_FILE)
 	@mv $(AMALGAMATED_FWD_FILE)~ $(AMALGAMATED_FWD_FILE)
+	@mv BUILD.bazel BUILD.bazel~
+	@$(MAKE) BUILD.bazel
+	@diff BUILD.bazel BUILD.bazel~ || (echo "===================================================================\n  BUILD.bazel is out of date! Please run 'make BUILD.bazel'.\n===================================================================" ; mv BUILD.bazel~ BUILD.bazel ; false)
+	@mv BUILD.bazel~ BUILD.bazel
 
-BUILD.bazel: $(SRCS)
+# generate the Bazel BUILD file; phony, because a removed header would not trigger a rebuild
+BUILD.bazel:
 	cmake -P cmake/scripts/gen_bazel_build_file.cmake
 
 ##########################################################################
diff --git a/cmake/scripts/gen_bazel_build_file.cmake b/cmake/scripts/gen_bazel_build_file.cmake
index e754d387d..3c7db9493 100644
--- a/cmake/scripts/gen_bazel_build_file.cmake
+++ b/cmake/scripts/gen_bazel_build_file.cmake
@@ -1,24 +1,58 @@
 # generate Bazel BUILD file
+#
+# usage: cmake -P cmake/scripts/gen_bazel_build_file.cmake (or: make BUILD.bazel)
+#
+# The header list of the "json" target is derived from the files in include/. Everything else is fixed text below,
+# so edit this script rather than BUILD.bazel.
 
-set(PROJECT_ROOT "${CMAKE_CURRENT_LIST_DIR}/../..")
+get_filename_component(PROJECT_ROOT "${CMAKE_CURRENT_LIST_DIR}/../.." ABSOLUTE)
 set(BUILD_FILE "${PROJECT_ROOT}/BUILD.bazel")
 
-file(GLOB_RECURSE HEADERS LIST_DIRECTORIES false RELATIVE "${PROJECT_ROOT}" "include/*.hpp")
+file(GLOB_RECURSE HEADERS LIST_DIRECTORIES false RELATIVE "${PROJECT_ROOT}" "${PROJECT_ROOT}/include/*.hpp")
+list(SORT HEADERS)
+
+set(CONTENT [=[
+load("@rules_cc//cc:cc_library.bzl", "cc_library")
+load("@rules_license//rules:license.bzl", "license")
+
+package(
+    default_applicable_licenses = [":license"],
+)
+
+exports_files([
+    "LICENSE.MIT",
+])
+
+license(
+    name = "license",
+    license_kinds = ["@rules_license//licenses/spdx:MIT"],
+    license_text = "LICENSE.MIT",
+)
 
-file(WRITE "${BUILD_FILE}" [=[
 cc_library(
     name = "json",
     hdrs = [
 ]=])
 
 foreach(header ${HEADERS})
-    file(APPEND "${BUILD_FILE}" "        \"${header}\",\n")
+    string(APPEND CONTENT "        \"${header}\",\n")
 endforeach()
 
-file(APPEND "${BUILD_FILE}" [=[
+string(APPEND CONTENT [=[
     ],
     includes = ["include"],
     visibility = ["//visibility:public"],
     alwayslink = True,
 )
+
+cc_library(
+    name = "singleheader-json",
+    hdrs = [
+        "single_include/nlohmann/json.hpp",
+    ],
+    includes = ["single_include"],
+    visibility = ["//visibility:public"],
+)
 ]=])
+
+file(WRITE "${BUILD_FILE}" "${CONTENT}")