diff --git a/pkgs/development/interpreters/clojure/default.nix b/pkgs/development/interpreters/clojure/default.nix
index c7608ae0277..008885d37d3 100644
--- a/pkgs/development/interpreters/clojure/default.nix
+++ b/pkgs/development/interpreters/clojure/default.nix
@@ -34,6 +34,7 @@ stdenv.mkDerivation rec {
 
       echo "Installing clojure and clj into $bin_dir"
       substituteInPlace clojure --replace PREFIX $out
+      substituteInPlace clj --replace BINDIR $bin_dir
       install -Dm755 clojure "$bin_dir/clojure"
       install -Dm755 clj "$bin_dir/clj"
 
diff --git a/pkgs/development/tools/misc/hydra/common.nix b/pkgs/development/tools/misc/hydra/common.nix
index 9ad8295c9b9..a056925bc23 100644
--- a/pkgs/development/tools/misc/hydra/common.nix
+++ b/pkgs/development/tools/misc/hydra/common.nix
@@ -26,6 +26,7 @@ let
         CatalystPluginAccessLog
         CatalystPluginAuthorizationRoles
         CatalystPluginCaptcha
+        CatalystPluginPrometheusTiny
         CatalystPluginSessionStateCookie
         CatalystPluginSessionStoreFastMmap
         CatalystPluginSmartURI
@@ -59,6 +60,7 @@ let
         NetPrometheus
         NetStatsd
         PadWalker
+        PrometheusTinyShared
         Readonly
         SQLSplitStatement
         SetScalar
diff --git a/pkgs/development/tools/misc/hydra/default.nix b/pkgs/development/tools/misc/hydra/default.nix
index a124b4a5c6e..ac5600519b4 100644
--- a/pkgs/development/tools/misc/hydra/default.nix
+++ b/pkgs/development/tools/misc/hydra/default.nix
@@ -2,12 +2,12 @@
 
 {
   hydra-unstable = callPackage ./common.nix {
-    version = "2021-05-03";
+    version = "2021-08-11";
     src = fetchFromGitHub {
       owner = "NixOS";
       repo = "hydra";
-      rev = "886e6f85e45a1f757e9b77d2a9e4539fbde29468";
-      sha256 = "t7Qb57Xjc0Ou+VDGC1N5u9AmeODW6MVOwKSrYRJq5f0=";
+      rev = "9bce425c3304173548d8e822029644bb51d35263";
+      sha256 = "sha256-tGzwKNW/odtAYcazWA9bPVSmVXMGKfXsqCA1UYaaxmU=";
     };
     nix = nixUnstable;
 
diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index bc743a3c54e..f9a476f6be6 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -228,13 +228,13 @@ in rec {
   nixUnstable = lib.lowPrio (callPackage common rec {
     pname = "nix";
     version = "2.4${suffix}";
-    suffix = "pre20210707_02dd6bb";
+    suffix = "pre20210802_47e96bb";
 
     src = fetchFromGitHub {
       owner = "NixOS";
       repo = "nix";
-      rev = "02dd6bb610e55a009cd7a4c83639698d3a7acaa2";
-      sha256 = "sha256-ARRiLrDOK+JQtvVXsYegspENYimQzilvdTfO7eiBuaA=";
+      rev = "47e96bb533f8cacc171bec9b688b134de31a48a9";
+      sha256 = "sha256-vwj1fAGn3Pl9Vr/qSL+oDxuwbRzEdI3dsEg6o3xTmWg=";
     };
 
     boehmgc = boehmgc_nixUnstable;
diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 92d412c9460..7955178ed16 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -2150,6 +2150,21 @@ let
     };
   };
 
+  CatalystPluginPrometheusTiny = buildPerlPackage {
+    pname = "Catalyst-Plugin-PrometheusTiny";
+    version = "0.006";
+    src = fetchurl {
+      url = "mirror://cpan/authors/id/S/SY/SYSPETE/Catalyst-Plugin-PrometheusTiny-0.006.tar.gz";
+      sha256 = "1hd2nv21c2mq3yvhsys4a276bdwr5igs4b73m99v7ymzpabvjf9b";
+    };
+    buildInputs = [ HTTPMessage Plack SubOverride TestDeep ];
+    propagatedBuildInputs = [ CatalystRuntime Moose PrometheusTiny PrometheusTinyShared ];
+    meta = {
+      description = "Prometheus metrics for Catalyst";
+      license = with lib.licenses; [ artistic1 gpl1Plus ];
+    };
+  };
+
   CatalystPluginSession = buildPerlPackage {
     pname = "Catalyst-Plugin-Session";
     version = "0.41";
@@ -4932,6 +4947,20 @@ let
     };
   };
 
+  DataRandom = buildPerlPackage {
+    pname = "Data-Random";
+    version = "0.13";
+    src = fetchurl {
+      url = "mirror://cpan/authors/id/B/BA/BAREFOOT/Data-Random-0.13.tar.gz";
+      sha256 = "eb590184a8db28a7e49eab09e25f8650c33f1f668b6a472829de74a53256bfc0";
+    };
+    buildInputs = [ FileShareDirInstall TestMockTime ];
+    meta = {
+      description = "Perl module to generate random data";
+      license = with lib.licenses; [ artistic1 gpl1Plus ];
+    };
+  };
+
   DataSection = buildPerlPackage {
     pname = "Data-Section";
     version = "0.200007";
@@ -9402,6 +9431,20 @@ let
     };
   };
 
+  HashSharedMem = buildPerlModule {
+    pname = "Hash-SharedMem";
+    version = "0.005";
+    src = fetchurl {
+      url = "mirror://cpan/authors/id/Z/ZE/ZEFRAM/Hash-SharedMem-0.005.tar.gz";
+      sha256 = "324776808602f7bdc44adaa937895365454029a926fa611f321c9bf6b940bb5e";
+    };
+    buildInputs = [ ScalarString ];
+    meta = {
+      description = "Efficient shared mutable hash";
+      license = with lib.licenses; [ artistic1 gpl1Plus ];
+    };
+  };
+
   HashUtilFieldHashCompat = buildPerlPackage {
     pname = "Hash-Util-FieldHash-Compat";
     version = "0.11";
@@ -17420,6 +17463,37 @@ let
     propagatedBuildInputs = [ IPCSignal ];
   };
 
+  PrometheusTiny = buildPerlPackage {
+    pname = "Prometheus-Tiny";
+    version = "0.008";
+    src = fetchurl {
+      url = "mirror://cpan/authors/id/R/RO/ROBN/Prometheus-Tiny-0.008.tar.gz";
+      sha256 = "17d7b69chkcq8fprww6m15glndyb0lms2l0xjbnbw04q7f8ncskk";
+    };
+    buildInputs = [ HTTPMessage Plack TestException ];
+    meta = {
+      homepage = "https://github.com/robn/Prometheus-Tiny";
+      description = "A tiny Prometheus client";
+      license = with lib.licenses; [ artistic1 gpl1Plus ];
+    };
+  };
+
+  PrometheusTinyShared = buildPerlPackage {
+    pname = "Prometheus-Tiny-Shared";
+    version = "0.024";
+    src = fetchurl {
+      url = "mirror://cpan/authors/id/R/RO/ROBN/Prometheus-Tiny-Shared-0.024.tar.gz";
+      sha256 = "02w24r4amk8dqlavg6abxap48hzxrbda48f1pmrqypgx1cz59g4g";
+    };
+    buildInputs = [ DataRandom HTTPMessage Plack TestDifferences TestException ];
+    propagatedBuildInputs = [ HashSharedMem JSONXS PrometheusTiny ];
+    meta = {
+      homepage = "https://github.com/robn/Prometheus-Tiny-Shared";
+      description = "A tiny Prometheus client with a shared database behind it";
+      license = with lib.licenses; [ artistic1 gpl1Plus ];
+    };
+  };
+
   ProtocolRedis = buildPerlPackage {
     pname = "Protocol-Redis";
     version = "1.0011";