diff --git a/pkgs/development/compilers/llvm/11/clang/default.nix b/pkgs/development/compilers/llvm/11/clang/default.nix
index 53292ef844b2590..6fd28904ac6ac4b 100644
--- a/pkgs/development/compilers/llvm/11/clang/default.nix
+++ b/pkgs/development/compilers/llvm/11/clang/default.nix
@@ -8,7 +8,7 @@ let
     pname = "clang";
     inherit version;
 
-    src = fetch "clang" "1p64l5a3x55118nyms1805qbk3r9w37nz1rb7xvbgc9fmyzaffay";
+    src = fetch "clang" "18wgmlqs2v2f504a5r4s789rfyjkixpn5pszhvxjgaaq5ipq5798";
     inherit clang-tools-extra_src;
 
     unpackPhase = ''
diff --git a/pkgs/development/compilers/llvm/11/compiler-rt.nix b/pkgs/development/compilers/llvm/11/compiler-rt.nix
index 43c55177432b254..55b0c183f067774 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 "0cpyi5g0wlwyb7gvy47k5rjiipnlhrr3ks4q4rlrlyax6w9dx98n";
+  src = fetch pname "0q9b9qgdvsgax5cgbjzis2lcxvf1gjhzhjfpnfcksh582vmrgq09";
 
   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 dc75fe9f96e7523..be63691ecdcae5f 100644
--- a/pkgs/development/compilers/llvm/11/default.nix
+++ b/pkgs/development/compilers/llvm/11/default.nix
@@ -6,7 +6,7 @@
 
 let
   release_version = "11.0.0";
-  candidate = "rc5";
+  candidate = "rc6";
   version = "${release_version}${candidate}"; # differentiating these (variables) is important for RCs
   targetConfig = stdenv.targetPlatform.config;
 
@@ -15,7 +15,7 @@ let
     inherit sha256;
   };
 
-  clang-tools-extra_src = fetch "clang-tools-extra" "0slqx5430pc699idabqnq34s9n0y2fq6q8z8hn5wakbi93dal71r";
+  clang-tools-extra_src = fetch "clang-tools-extra" "03in5x5h5jypswhyq4qivn56pli7rcgi82zz1p708jb12r91c5dw";
 
   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 e6a940f76eccfa5..2286780f97080bc 100644
--- a/pkgs/development/compilers/llvm/11/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/11/libc++/default.nix
@@ -5,7 +5,7 @@ stdenv.mkDerivation {
   pname = "libc++";
   inherit version;
 
-  src = fetch "libcxx" "1rlp8hx0nmqpx0gxq8hh9kqbkkzfpadx9chm47c38d4lahdksr1v";
+  src = fetch "libcxx" "1fmxf385m3z3a56c5rrshnq4a3bwy3gijs880vlqznfgpkz9dgga";
 
   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 3ebf8615a321c13..ae9f7c86d6e74ea 100644
--- a/pkgs/development/compilers/llvm/11/libc++abi.nix
+++ b/pkgs/development/compilers/llvm/11/libc++abi.nix
@@ -5,7 +5,7 @@ stdenv.mkDerivation {
   pname = "libc++abi";
   inherit version;
 
-  src = fetch "libcxxabi" "0214sl9m80hb8v0mdkrwl8l4ca3dvapis23mkld85bnxa8zq2c1q";
+  src = fetch "libcxxabi" "0wk1n8m9wilv1avaghc4ik9ls1m64jsghkjsq358ls6r4h1znqzz";
 
   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 0fc3fcabb33f830..1c6e1f19fd57cb4 100644
--- a/pkgs/development/compilers/llvm/11/libunwind.nix
+++ b/pkgs/development/compilers/llvm/11/libunwind.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation rec {
   pname = "libunwind";
   inherit version;
 
-  src = fetch pname "1xw8y6agnix7qlwh676gm1kbkzh9c1nz7l3vhxjpazbk70biz9mq";
+  src = fetch pname "1rxfwmdx1wl53id0c3f7a6hmzc2wlz6x85yqg2qi9q0c40yngfsy";
 
   nativeBuildInputs = [ cmake ];
 
diff --git a/pkgs/development/compilers/llvm/11/lld.nix b/pkgs/development/compilers/llvm/11/lld.nix
index 364fdb727d024a4..c391c41a0f5d339 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 "1ibyahcxxckdfwh95f1dzxgcf1fsd0r9rpanm3dnn6nb99mn0is4";
+  src = fetch pname "056r8xjcs45mf9njnzjw6fmdbmagwpy13wk7xlf6sqhx5ap7wgr4";
 
   nativeBuildInputs = [ cmake ];
   buildInputs = [ llvm libxml2 ];
diff --git a/pkgs/development/compilers/llvm/11/lldb.nix b/pkgs/development/compilers/llvm/11/lldb.nix
index b79496921450780..42c0ef9f975faf9 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 "1v8nvw6rxmi7w3ayjcjan4plb5ryhizc41sras7fza2l7n3cz8iz";
+  src = fetch pname "13bc7jfrx3krp23x7q0fvwicvz7vicks064m3ip57sr84i8wbjlr";
 
   patches = [ ./lldb-procfs.patch ];
 
diff --git a/pkgs/development/compilers/llvm/11/llvm.nix b/pkgs/development/compilers/llvm/11/llvm.nix
index 65c41e69a5ce4b4..ffdea1de375e3a6 100644
--- a/pkgs/development/compilers/llvm/11/llvm.nix
+++ b/pkgs/development/compilers/llvm/11/llvm.nix
@@ -32,8 +32,8 @@ in stdenv.mkDerivation (rec {
   pname = "llvm";
   inherit version;
 
-  src = fetch pname "1k7i2syqdm29l10di3ws64i02snh9jhd1s2jzgh8565b0vg25wlc";
-  polly_src = fetch "polly" "0l0n09f6sy30x825w85v8n7pvya0ciq89r0abv66n8ggwmrk3rnw";
+  src = fetch pname "173hjlznk15v2p773y66s2ivml5g1h630hajvdvwlyvs2var8192";
+  polly_src = fetch "polly" "0icq030x6l4zw8kmjcilf56gz7aim34w51c1j7gfhf1i9iv2vy9x";
 
   unpackPhase = ''
     unpackFile $src
diff --git a/pkgs/development/compilers/llvm/11/openmp.nix b/pkgs/development/compilers/llvm/11/openmp.nix
index 3cc19ad711d68d1..41242786705d133 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 "1yq7m0kwnlgq8ni719g9fny0x5wrvm8szp11b3q8zz39rqqyphsz";
+  src = fetch pname "0f5wmwp54k7q7136mr2an2zgryj19s3kr7312pb5675rxw8bxn8q";
 
   nativeBuildInputs = [ cmake perl ];
   buildInputs = [ llvm ];