diff --git a/.bazelrc b/.bazelrc
index 325b24b0aa..496f91b705 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -56,9 +56,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/all_crate_deps/.bazelrc b/examples/all_crate_deps/.bazelrc
index 82c4392d5a..a150dc0819 100644
--- a/examples/all_crate_deps/.bazelrc
+++ b/examples/all_crate_deps/.bazelrc
@@ -1,8 +1,5 @@
 # This isn't currently the default in Bazel, but we enable it to test we'll be ready if/when it flips.
 build --incompatible_disallow_empty_glob
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
diff --git a/examples/all_deps_vendor/.bazelrc b/examples/all_deps_vendor/.bazelrc
index e17335d9e0..0843729592 100644
--- a/examples/all_deps_vendor/.bazelrc
+++ b/examples/all_deps_vendor/.bazelrc
@@ -41,9 +41,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/android/.bazelrc b/examples/android/.bazelrc
index 475821957f..9d50dcd516 100644
--- a/examples/android/.bazelrc
+++ b/examples/android/.bazelrc
@@ -61,9 +61,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 ###############################################################################
 ## Bzlmod
 ###############################################################################
diff --git a/examples/bazel_env/.bazelrc b/examples/bazel_env/.bazelrc
index fda9a43f16..9ee8d0e272 100644
--- a/examples/bazel_env/.bazelrc
+++ b/examples/bazel_env/.bazelrc
@@ -30,9 +30,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/compile_opt/.bazelrc b/examples/compile_opt/.bazelrc
index 7a58087677..3d9c973c4f 100644
--- a/examples/compile_opt/.bazelrc
+++ b/examples/compile_opt/.bazelrc
@@ -1,9 +1,6 @@
 # This isn't currently the default in Bazel, but we enable it to test we'll be ready if/when it flips.
 build --incompatible_disallow_empty_glob
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/crate_universe/.bazelrc b/examples/crate_universe/.bazelrc
index 647a2afc3e..883f004db4 100644
--- a/examples/crate_universe/.bazelrc
+++ b/examples/crate_universe/.bazelrc
@@ -23,9 +23,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/crate_universe_local_path/.bazelrc b/examples/crate_universe_local_path/.bazelrc
index 8c7e2612ee..adc2d04be5 100644
--- a/examples/crate_universe_local_path/.bazelrc
+++ b/examples/crate_universe_local_path/.bazelrc
@@ -53,9 +53,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/cross_compile/.bazelrc b/examples/cross_compile/.bazelrc
index e17335d9e0..0843729592 100644
--- a/examples/cross_compile/.bazelrc
+++ b/examples/cross_compile/.bazelrc
@@ -41,9 +41,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/hello_world/.bazelrc b/examples/hello_world/.bazelrc
index b8a688b783..729e630c88 100644
--- a/examples/hello_world/.bazelrc
+++ b/examples/hello_world/.bazelrc
@@ -38,9 +38,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/hello_world_no_cargo/.bazelrc b/examples/hello_world_no_cargo/.bazelrc
index e17335d9e0..0843729592 100644
--- a/examples/hello_world_no_cargo/.bazelrc
+++ b/examples/hello_world_no_cargo/.bazelrc
@@ -41,9 +41,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/ios/.bazelrc b/examples/ios/.bazelrc
index f3e5a5d06f..58a695f4bf 100644
--- a/examples/ios/.bazelrc
+++ b/examples/ios/.bazelrc
@@ -53,9 +53,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 ###############################################################################
 ## Bzlmod
 ###############################################################################
diff --git a/examples/ios_build/.bazelrc b/examples/ios_build/.bazelrc
index f3e5a5d06f..58a695f4bf 100644
--- a/examples/ios_build/.bazelrc
+++ b/examples/ios_build/.bazelrc
@@ -53,9 +53,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 ###############################################################################
 ## Bzlmod
 ###############################################################################
diff --git a/examples/musl_cross_compiling/.bazelrc b/examples/musl_cross_compiling/.bazelrc
index 8c7e2612ee..adc2d04be5 100644
--- a/examples/musl_cross_compiling/.bazelrc
+++ b/examples/musl_cross_compiling/.bazelrc
@@ -53,9 +53,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/nix_cross_compiling/.bazelrc b/examples/nix_cross_compiling/.bazelrc
index 3c53fbb928..8b982d723b 100644
--- a/examples/nix_cross_compiling/.bazelrc
+++ b/examples/nix_cross_compiling/.bazelrc
@@ -69,9 +69,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/override_target/.bazelrc b/examples/override_target/.bazelrc
index 82c4392d5a..a150dc0819 100644
--- a/examples/override_target/.bazelrc
+++ b/examples/override_target/.bazelrc
@@ -1,8 +1,5 @@
 # This isn't currently the default in Bazel, but we enable it to test we'll be ready if/when it flips.
 build --incompatible_disallow_empty_glob
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
diff --git a/examples/proto/.bazelrc b/examples/proto/.bazelrc
index e5b903ffbe..6d8939cc98 100644
--- a/examples/proto/.bazelrc
+++ b/examples/proto/.bazelrc
@@ -41,9 +41,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/proto_with_toolchain/.bazelrc b/examples/proto_with_toolchain/.bazelrc
index e5b903ffbe..6d8939cc98 100644
--- a/examples/proto_with_toolchain/.bazelrc
+++ b/examples/proto_with_toolchain/.bazelrc
@@ -41,9 +41,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/examples/sys/.bazelrc b/examples/sys/.bazelrc
index e17335d9e0..0843729592 100644
--- a/examples/sys/.bazelrc
+++ b/examples/sys/.bazelrc
@@ -41,9 +41,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/extensions/bindgen/.bazelrc b/extensions/bindgen/.bazelrc
index a1fc7780af..a2e6587a8e 100644
--- a/extensions/bindgen/.bazelrc
+++ b/extensions/bindgen/.bazelrc
@@ -53,9 +53,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/extensions/mdbook/.bazelrc b/extensions/mdbook/.bazelrc
index a1fc7780af..a2e6587a8e 100644
--- a/extensions/mdbook/.bazelrc
+++ b/extensions/mdbook/.bazelrc
@@ -53,9 +53,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/extensions/prost/.bazelrc b/extensions/prost/.bazelrc
index a1fc7780af..a2e6587a8e 100644
--- a/extensions/prost/.bazelrc
+++ b/extensions/prost/.bazelrc
@@ -53,9 +53,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/extensions/protobuf/.bazelrc b/extensions/protobuf/.bazelrc
index a1fc7780af..a2e6587a8e 100644
--- a/extensions/protobuf/.bazelrc
+++ b/extensions/protobuf/.bazelrc
@@ -53,9 +53,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/extensions/wasm_bindgen/.bazelrc b/extensions/wasm_bindgen/.bazelrc
index e459b2c912..965ff4b0f1 100644
--- a/extensions/wasm_bindgen/.bazelrc
+++ b/extensions/wasm_bindgen/.bazelrc
@@ -61,9 +61,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/test/integration/cc_common_link/.bazelrc b/test/integration/cc_common_link/.bazelrc
index 5a87dbae73..aa7332a5e1 100644
--- a/test/integration/cc_common_link/.bazelrc
+++ b/test/integration/cc_common_link/.bazelrc
@@ -25,9 +25,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/test/integration/cc_common_link_with_global_alloc/.bazelrc b/test/integration/cc_common_link_with_global_alloc/.bazelrc
index 9cb01c8f00..f6c4970be9 100644
--- a/test/integration/cc_common_link_with_global_alloc/.bazelrc
+++ b/test/integration/cc_common_link_with_global_alloc/.bazelrc
@@ -26,9 +26,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=
 
diff --git a/test/integration/no_std/.bazelrc b/test/integration/no_std/.bazelrc
index cab64f52a3..833dfdca2d 100644
--- a/test/integration/no_std/.bazelrc
+++ b/test/integration/no_std/.bazelrc
@@ -69,9 +69,6 @@ build --incompatible_disallow_empty_glob=true
 # https://github.com/bazelbuild/bazel/issues/12821
 build --nolegacy_external_runfiles
 
-# Required for cargo_build_script support before Bazel 7
-build --incompatible_merge_fixed_and_default_shell_env
-
 # https://github.com/bazelbuild/bazel/issues/23043.
 build --incompatible_autoload_externally=