diff -Naur mozjs-78.6.0.orig/.cargo/config.in mozjs-78.6.0/.cargo/config.in
--- mozjs-78.6.0.orig/.cargo/config.in	2020-11-28 17:33:01.000000000 +0100
+++ mozjs-78.6.0/.cargo/config.in	2021-02-26 08:45:50.995837000 +0100
@@ -3,9 +3,9 @@
 # Please do not edit.
 
 [source."https://github.com/shravanrn/nix/"]
-branch = "r0.13.1"
 git = "https://github.com/shravanrn/nix/"
 replace-with = "vendored-sources"
+rev = "4af6c367603869a30fddb5ffb0aba2b9477ba92e"
 
 [source."https://github.com/mozilla/rkv"]
 git = "https://github.com/mozilla/rkv"
diff -Naur mozjs-78.6.0.orig/Cargo.lock mozjs-78.6.0/Cargo.lock
--- mozjs-78.6.0.orig/Cargo.lock	2020-11-28 17:33:01.000000000 +0100
+++ mozjs-78.6.0/Cargo.lock	2021-02-26 08:47:06.265837000 +0100
@@ -3200,7 +3200,7 @@
 [[package]]
 name = "nix"
 version = "0.13.1"
-source = "git+https://github.com/shravanrn/nix/?branch=r0.13.1#4af6c367603869a30fddb5ffb0aba2b9477ba92e"
+source = "git+https://github.com/shravanrn/nix/?rev=4af6c367603869a30fddb5ffb0aba2b9477ba92e#4af6c367603869a30fddb5ffb0aba2b9477ba92e"
 dependencies = [
  "bitflags",
  "cc",
diff -Naur mozjs-78.6.0.orig/Cargo.toml mozjs-78.6.0/Cargo.toml
--- mozjs-78.6.0.orig/Cargo.toml	2020-11-28 17:34:26.000000000 +0100
+++ mozjs-78.6.0/Cargo.toml	2021-02-26 08:48:06.663837000 +0100
@@ -60,8 +60,8 @@
 [patch.crates-io]
 packed_simd = { git = "https://github.com/hsivonen/packed_simd", rev="3541e3818fdc7c2a24f87e3459151a4ce955a67a" }
 rlbox_lucet_sandbox = { git = "https://github.com/PLSysSec/rlbox_lucet_sandbox/", rev="d510da5999a744c563b0acd18056069d1698273f" }
-nix = { git = "https://github.com/shravanrn/nix/", branch = "r0.13.1", rev="4af6c367603869a30fddb5ffb0aba2b9477ba92e" }
-spirv_cross = { git = "https://github.com/kvark/spirv_cross", branch = "wgpu3", rev = "20191ad2f370afd6d247edcb9ff9da32d3bedb9c" }
+nix = { git = "https://github.com/shravanrn/nix/", rev="4af6c367603869a30fddb5ffb0aba2b9477ba92e" }
+spirv_cross = { git = "https://github.com/kvark/spirv_cross", branch = "wgpu4" }
 # failure's backtrace feature might break our builds, see bug 1608157.
 failure = { git = "https://github.com/badboy/failure", rev = "64af847bc5fdcb6d2438bec8a6030812a80519a5" }
 failure_derive = { git = "https://github.com/badboy/failure", rev = "64af847bc5fdcb6d2438bec8a6030812a80519a5" }