diff --git a/pkgs/development/tools/misc/hydra/common.nix b/pkgs/development/tools/misc/hydra/common.nix
index 0cc7769d3c5..9ad8295c9b9 100644
--- a/pkgs/development/tools/misc/hydra/common.nix
+++ b/pkgs/development/tools/misc/hydra/common.nix
@@ -37,6 +37,8 @@ let
         CatalystViewTT
         CatalystXScriptServerStarman
         CatalystXRoleApplicator
+        CryptPassphrase
+        CryptPassphraseArgon2
         CryptRandPasswd
         DBDPg
         DBDSQLite
@@ -61,6 +63,7 @@ let
         SQLSplitStatement
         SetScalar
         Starman
+        StringCompareConstantTime
         SysHostnameLong
         TermSizeAny
         TextDiff
diff --git a/pkgs/development/tools/misc/hydra/default.nix b/pkgs/development/tools/misc/hydra/default.nix
index 7bed3b5d202..142322eb59d 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 = "2021-04-29";
+    version = "2021-05-03";
     src = fetchFromGitHub {
       owner = "NixOS";
       repo = "hydra";
-      rev = "6047b1dd04d44acff9343b6b971ab609b73099d5";
-      sha256 = "sha256-E7JOHhSd4gIzE6FvSZVMxZE9WagbBkrfZVoibkanaYE=";
+      rev = "886e6f85e45a1f757e9b77d2a9e4539fbde29468";
+      sha256 = "t7Qb57Xjc0Ou+VDGC1N5u9AmeODW6MVOwKSrYRJq5f0=";
     };
     nix = nixFlakes;