diff --git a/pkgs/development/tools/misc/hydra/common.nix b/pkgs/development/tools/misc/hydra/common.nix
index 4e9daab9bf1c..4af9fe045874 100644
--- a/pkgs/development/tools/misc/hydra/common.nix
+++ b/pkgs/development/tools/misc/hydra/common.nix
@@ -66,6 +66,7 @@ let
         TextDiff
         TextTable
         XMLSimple
+        YAML
         nix
         nix.perl-bindings
         git
diff --git a/pkgs/development/tools/misc/hydra/default.nix b/pkgs/development/tools/misc/hydra/default.nix
index a6b0383d54f7..75f6ac56624b 100644
--- a/pkgs/development/tools/misc/hydra/default.nix
+++ b/pkgs/development/tools/misc/hydra/default.nix
@@ -24,12 +24,12 @@
   # so when having an older version, `pkgs.hydra-migration` should be deployed first.
 
   hydra-unstable = callPackage ./common.nix {
-    version = "2020-09-02";
+    version = "2020-10-20";
     src = fetchFromGitHub {
       owner = "NixOS";
       repo = "hydra";
-      rev = "e707990e2d6afab203c7ef1d769d49c564eff151";
-      sha256 = "0iilf953f6s58szzyd1hzc9b2b2yw8lhbsb8xrb08szpfz7ifwqa";
+      rev = "79d34ed7c93af2daf32cf44ee0e3e0768f13f97c";
+      sha256 = "1lql899430137l6ghnhyz0ivkayy83fdr087ck2wq3gf1jv8pccj";
     };
     nix = nixFlakes;