diff --git a/pkgs/development/compilers/llvm/11/clang/default.nix b/pkgs/development/compilers/llvm/11/clang/default.nix
index aed5b66368f..24d6da97bf1 100644
--- a/pkgs/development/compilers/llvm/11/clang/default.nix
+++ b/pkgs/development/compilers/llvm/11/clang/default.nix
@@ -8,12 +8,12 @@ let
     pname = "clang";
     inherit version;
 
-    src = fetch "clang" "02ajkij85966vd150iy246mv16dsaph1kfi0y8wnncp8w6nar5hg";
+    src = fetch "clang" "0kab4zmkxffg98a3rx95756jlwhxflalin5w05g1anpwxv175xbk";
     inherit clang-tools-extra_src;
 
     unpackPhase = ''
       unpackFile $src
-      mv clang-${version}* clang
+      mv clang-* clang
       sourceRoot=$PWD/clang
       unpackFile ${clang-tools-extra_src}
       mv clang-tools-extra-* $sourceRoot/tools/extra
diff --git a/pkgs/development/compilers/llvm/11/compiler-rt.nix b/pkgs/development/compilers/llvm/11/compiler-rt.nix
index 9a596e00e1b..3f8c092fce2 100644
--- a/pkgs/development/compilers/llvm/11/compiler-rt.nix
+++ b/pkgs/development/compilers/llvm/11/compiler-rt.nix
@@ -11,7 +11,7 @@ in
 stdenv.mkDerivation rec {
   pname = "compiler-rt";
   inherit version;
-  src = fetch pname "0d5j5l8phwqjjscmk8rmqn0i2i0abl537gdbkagl8fjpzy1gyjip";
+  src = fetch pname "1z470r8c5aahdwkmflglx998n0i77j8b1c69d7cir1kf27qy6yq8";
 
   nativeBuildInputs = [ cmake python3 llvm ];
   buildInputs = stdenv.lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
diff --git a/pkgs/development/compilers/llvm/11/default.nix b/pkgs/development/compilers/llvm/11/default.nix
index e6765ec6899..b354bd6b44a 100644
--- a/pkgs/development/compilers/llvm/11/default.nix
+++ b/pkgs/development/compilers/llvm/11/default.nix
@@ -6,16 +6,18 @@
 }:
 
 let
-  release_version = "11.0.0";
-  version = release_version; # differentiating these (variables) is important for RCs
+  release_version = "11.0.1";
+  candidate = ""; # empty or "rcN"
+  dash-candidate = stdenv.lib.optionalString (candidate != "") "-${candidate}";
+  version = "${release_version}${dash-candidate}"; # differentiating these (variables) is important for RCs
   targetConfig = stdenv.targetPlatform.config;
 
   fetch = name: sha256: fetchurl {
-    url = "https://github.com/llvm/llvm-project/releases/download/llvmorg-${release_version}/${name}-${version}.src.tar.xz";
+    url = "https://github.com/llvm/llvm-project/releases/download/llvmorg-${version}/${name}-${release_version}${candidate}.src.tar.xz";
     inherit sha256;
   };
 
-  clang-tools-extra_src = fetch "clang-tools-extra" "02bcwwn54661madhq4nxc069s7p7pj5gpqi8ww50w3anbpviilzy";
+  clang-tools-extra_src = fetch "clang-tools-extra" "1j8n6n4l54k2lrdxh266y1fl4z8vy5dc76wsf0csk5n3ikfi38ic";
 
   tools = stdenv.lib.makeExtensible (tools: let
     callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch; });
diff --git a/pkgs/development/compilers/llvm/11/libc++/default.nix b/pkgs/development/compilers/llvm/11/libc++/default.nix
index a74510c717b..d0b581c0460 100644
--- a/pkgs/development/compilers/llvm/11/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/11/libc++/default.nix
@@ -6,7 +6,7 @@ stdenv.mkDerivation {
   pname = "libc++";
   inherit version;
 
-  src = fetch "libcxx" "0ylbkcd38zrrz9xmkq9na3d9s8d96hc286dwfwd73wi205lyc7kc";
+  src = fetch "libcxx" "0gaybwkn76vhakvipxslp7pmv2wm7agxkqwk5f5aizhzc9lzdmcz";
 
   postUnpack = ''
     unpackFile ${libcxxabi.src}
diff --git a/pkgs/development/compilers/llvm/11/libc++abi.nix b/pkgs/development/compilers/llvm/11/libc++abi.nix
index d173b1735cb..e87622b23b2 100644
--- a/pkgs/development/compilers/llvm/11/libc++abi.nix
+++ b/pkgs/development/compilers/llvm/11/libc++abi.nix
@@ -6,7 +6,7 @@ stdenv.mkDerivation {
   pname = "libc++abi";
   inherit version;
 
-  src = fetch "libcxxabi" "05ac7rkjbla03bc0lf92f901dfjgxdvp8cr9fpn59a5p4x27ssaq";
+  src = fetch "libcxxabi" "0gv8pxq95gvsybldj21hdfkmm0r5cn1z7jhd72l231n0lmb70saa";
 
   nativeBuildInputs = [ cmake ];
   buildInputs = stdenv.lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD && !stdenv.hostPlatform.isWasm) libunwind;
diff --git a/pkgs/development/compilers/llvm/11/libunwind.nix b/pkgs/development/compilers/llvm/11/libunwind.nix
index e17b35ed624..5708b00c08a 100644
--- a/pkgs/development/compilers/llvm/11/libunwind.nix
+++ b/pkgs/development/compilers/llvm/11/libunwind.nix
@@ -6,7 +6,7 @@ stdenv.mkDerivation rec {
   pname = "libunwind";
   inherit version;
 
-  src = fetch pname "0bwjd2xf51r2apn8p0f9shb6nc8hnqzq1n9gggjvyjmi6cf02mc4";
+  src = fetch pname "0zsixkaiwp007afxlpsf5dc7wfrv8sj9wxzjw6f1r4bjv1rv3cvd";
 
   nativeBuildInputs = [ cmake ];
 
diff --git a/pkgs/development/compilers/llvm/11/lld.nix b/pkgs/development/compilers/llvm/11/lld.nix
index 81b829a2898..af02a5d4750 100644
--- a/pkgs/development/compilers/llvm/11/lld.nix
+++ b/pkgs/development/compilers/llvm/11/lld.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
   pname = "lld";
   inherit version;
 
-  src = fetch pname "077xyh7sij6mhp4dc4kdcmp9whrpz332fa12rwxnzp3wgd5bxrzg";
+  src = fetch pname "1dq82dkam8x2niha18v7ckh30zmzyclydzipqkf7h41r3ah0vfk0";
 
   nativeBuildInputs = [ cmake ];
   buildInputs = [ llvm libxml2 ];
diff --git a/pkgs/development/compilers/llvm/11/lldb.nix b/pkgs/development/compilers/llvm/11/lldb.nix
index 0282037c092..28bb75470a9 100644
--- a/pkgs/development/compilers/llvm/11/lldb.nix
+++ b/pkgs/development/compilers/llvm/11/lldb.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation (rec {
   pname = "lldb";
   inherit version;
 
-  src = fetch pname "0wic9lyb2la9bkzdc13szkm4f793w1mddp50xvh237iraygw0w45";
+  src = fetch pname "1yzjbsn81l2r3v9js2fxrglkwvz1f2rxyxh6430nydbrs0bqklz8";
 
   patches = [ ./lldb-procfs.patch ];
 
diff --git a/pkgs/development/compilers/llvm/11/llvm.nix b/pkgs/development/compilers/llvm/11/llvm.nix
index 4ec4104b6fa..2c29a30d76f 100644
--- a/pkgs/development/compilers/llvm/11/llvm.nix
+++ b/pkgs/development/compilers/llvm/11/llvm.nix
@@ -32,12 +32,12 @@ in stdenv.mkDerivation (rec {
   pname = "llvm";
   inherit version;
 
-  src = fetch pname "0s94lwil98w7zb7cjrbnxli0z7gklb312pkw74xs1d6zk346hgwi";
-  polly_src = fetch "polly" "0h442ivcslr3dv3q3g1nw5avh77f8cxsp6zild1hgspj266xpynw";
+  src = fetch pname "0a5mb65xa5bal8q6cb37xgkqis2bip87fsafgq3wbsva9cjprn6c";
+  polly_src = fetch "polly" "1smrqm9s0r2g9h0v0nil6y9wn2ih4l5bddk4dhgn538ngc7cxpq8";
 
   unpackPhase = ''
     unpackFile $src
-    mv llvm-${version}* llvm
+    mv llvm-${release_version}* llvm
     sourceRoot=$PWD/llvm
   '' + optionalString enablePolly ''
     unpackFile $polly_src
diff --git a/pkgs/development/compilers/llvm/11/openmp.nix b/pkgs/development/compilers/llvm/11/openmp.nix
index ae0ddcb1767..55a4ceb7e6e 100644
--- a/pkgs/development/compilers/llvm/11/openmp.nix
+++ b/pkgs/development/compilers/llvm/11/openmp.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
   pname = "openmp";
   inherit version;
 
-  src = fetch pname "0k389d0g9zlfyzh1kpb3i5jdawzpn0hrdxzbjinpvdv7rbw4sw1d";
+  src = fetch pname "19rcv25y41ww3zlfg0lwprzijl3cn7jgc0v5540jzpp7j0ds45ad";
 
   nativeBuildInputs = [ cmake perl ];
   buildInputs = [ llvm ];