diff --git a/rustc.spec b/rustc.spec
index 6433da7..939d9ca 100644
--- a/rustc.spec
+++ b/rustc.spec
@@ -1,6 +1,6 @@
 %define stage1 1
 Name:          rustc
-Version:       1.54.0
+Version:       1.56.0
 Release:       1mamba
 Summary:       The Rust programming language, designed to be a safe, concurrent, practical language
 Group:         Applications/Development
@@ -13,6 +13,7 @@ Patch0:        rustc-1.25.0-disable-llvm-ocaml-binding.patch
 License:       MIT
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
+BuildRequires: libatomic-devel
 BuildRequires: libcurl-devel
 BuildRequires: libgcc
 BuildRequires: libgit2-devel
@@ -45,8 +46,9 @@ This package contains the documentation for %{name}.
 %debug_package
 
 %prep
-%setup -q -n %{name}-%{version}-src -D -T
-:<< _EOF
+%setup -q -n %{name}-%{version}-src
+#-D -T
+#:<< _EOF
 #%patch0 -p0
 
 cat <<EOF > config.toml
@@ -129,6 +131,7 @@ cd -
 #%{_bindir}/miri
 %{_bindir}/rls
 #%{_bindir}/rust-analyzer
+%{_bindir}/rust-demangler
 %{_bindir}/rust-gdb
 %{_bindir}/rust-gdbgui
 %{_bindir}/rust-lldb
@@ -195,6 +198,9 @@ cd -
 #%doc README.md
 
 %changelog
+* Wed Oct 27 2021 Automatic Build System <autodist@mambasoft.it> 1.56.0-1mamba
+- automatic version update by autodist
+
 * Sun Aug 15 2021 Automatic Build System <autodist@mambasoft.it> 1.54.0-1mamba
 - automatic version update by autodist