diff --git a/Cargo.toml b/Cargo.toml
index 85796ef0488c..d6a7044c9289 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -63,6 +63,14 @@ rpath = false
 debug-assertions = false
 panic = "abort"
 
+# Optimize build dependencies, because bindgen and proc macros / style
+# compilation take more to run than to build otherwise.
+[profile.dev.build-override]
+opt-level = 1
+
+[profile.release.build-override]
+opt-level = 1
+
 [patch.crates-io]
 chardetng = { git = "https://github.com/hsivonen/chardetng", rev="7d5e0608d3e012bdfea3bd199111e3546607dd31" }
 libudev-sys = { path = "dom/webauthn/libudev-sys" }
diff --git a/build/moz.configure/rust.configure b/build/moz.configure/rust.configure
index 89a78aa83ccb..c83496816bcf 100644
--- a/build/moz.configure/rust.configure
+++ b/build/moz.configure/rust.configure
@@ -165,7 +165,7 @@ def rust_compiler(rustc_info, cargo_info, build_project):
             )
         )
     if build_project == "tools/crashreporter":
-        rustc_min_version = Version("1.38.0")
+        rustc_min_version = Version("1.47.0")
     else:
         rustc_min_version = Version(MINIMUM_RUST_VERSION)
     cargo_min_version = rustc_min_version
diff --git a/config/makefiles/rust.mk b/config/makefiles/rust.mk
index 3e98a1d16ce7..615d54076b20 100644
--- a/config/makefiles/rust.mk
+++ b/config/makefiles/rust.mk
@@ -72,14 +72,11 @@ ifndef MOZ_LTO_RUST_CROSS
 ifeq (,$(findstring gkrust_gtest,$(RUST_LIBRARY_FILE)))
 cargo_rustc_flags += -Clto
 endif
-# Versions of rust >= 1.45 need -Cembed-bitcode=yes for all crates when
-# using -Clto.
-ifeq (,$(filter 1.38.% 1.39.% 1.40.% 1.41.% 1.42.% 1.43.% 1.44.%,$(RUSTC_VERSION)))
+# We need -Cembed-bitcode=yes for all crates when using -Clto.
 RUSTFLAGS += -Cembed-bitcode=yes
 endif
 endif
 endif
-endif
 
 ifdef CARGO_INCREMENTAL
 export CARGO_INCREMENTAL