diff --git a/pkgs/development/tools/misc/hydra/default.nix b/pkgs/development/tools/misc/hydra/default.nix
index 142322eb59d..a124b4a5c6e 100644
--- a/pkgs/development/tools/misc/hydra/default.nix
+++ b/pkgs/development/tools/misc/hydra/default.nix
@@ -1,4 +1,4 @@
-{ fetchFromGitHub, nixStable, callPackage, nixFlakes, nixosTests }:
+{ fetchFromGitHub, nixStable, callPackage, nixUnstable, nixosTests }:
 
 {
   hydra-unstable = callPackage ./common.nix {
@@ -9,7 +9,7 @@
       rev = "886e6f85e45a1f757e9b77d2a9e4539fbde29468";
       sha256 = "t7Qb57Xjc0Ou+VDGC1N5u9AmeODW6MVOwKSrYRJq5f0=";
     };
-    nix = nixFlakes;
+    nix = nixUnstable;
 
     tests = {
       basic = nixosTests.hydra.hydra-unstable;
diff --git a/pkgs/tools/misc/nix-direnv/default.nix b/pkgs/tools/misc/nix-direnv/default.nix
index 61078e7edfe..94ce54a2a9a 100644
--- a/pkgs/tools/misc/nix-direnv/default.nix
+++ b/pkgs/tools/misc/nix-direnv/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, gnugrep, nixFlakes }:
+{ lib, stdenv, fetchFromGitHub, gnugrep, nixUnstable }:
 
 stdenv.mkDerivation rec {
   pname = "nix-direnv";
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   # Substitute instead of wrapping because the resulting file is
   # getting sourced, not executed:
   postPatch = ''
-    sed -i "1a NIX_BIN_PREFIX=${nixFlakes}/bin/" direnvrc
+    sed -i "1a NIX_BIN_PREFIX=${nixUnstable}/bin/" direnvrc
     substituteInPlace direnvrc --replace "grep" "${gnugrep}/bin/grep"
   '';
 
diff --git a/pkgs/tools/package-management/nix-update/default.nix b/pkgs/tools/package-management/nix-update/default.nix
index 296f3be49cc..c205550b267 100644
--- a/pkgs/tools/package-management/nix-update/default.nix
+++ b/pkgs/tools/package-management/nix-update/default.nix
@@ -1,7 +1,7 @@
 { lib
 , buildPythonApplication
 , fetchFromGitHub
-, nixFlakes
+, nixUnstable
 , nix-prefetch
 , nixpkgs-fmt
 , nixpkgs-review
@@ -19,7 +19,7 @@ buildPythonApplication rec {
   };
 
   makeWrapperArgs = [
-    "--prefix" "PATH" ":" (lib.makeBinPath [ nixFlakes nix-prefetch nixpkgs-fmt nixpkgs-review ])
+    "--prefix" "PATH" ":" (lib.makeBinPath [ nixUnstable nix-prefetch nixpkgs-fmt nixpkgs-review ])
   ];
 
   checkPhase = ''
diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index ec5099c5f6e..159fc5b39c1 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -227,12 +227,4 @@ in rec {
     ];
   });
 
-  nixExperimental = nixUnstable.overrideAttrs (prev: {
-    patches = (prev.patches or []) ++ [ ./enable-all-experimental.patch ];
-  });
-
-  nixFlakes = nixUnstable.overrideAttrs (prev: {
-    patches = (prev.patches or []) ++ [ ./enable-flakes.patch ];
-  });
-
 }
diff --git a/pkgs/tools/package-management/nix/enable-all-experimental.patch b/pkgs/tools/package-management/nix/enable-all-experimental.patch
deleted file mode 100644
index 1712b7295a5..00000000000
--- a/pkgs/tools/package-management/nix/enable-all-experimental.patch
+++ /dev/null
@@ -1,14 +0,0 @@
-diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
-index d3b27d7be..e7d002e1d 100644
---- a/src/libstore/globals.cc
-+++ b/src/libstore/globals.cc
-@@ -172,8 +172,7 @@ MissingExperimentalFeature::MissingExperimentalFeature(std::string feature)
- 
- void Settings::requireExperimentalFeature(const std::string & name)
- {
--    if (!isExperimentalFeatureEnabled(name))
--        throw MissingExperimentalFeature(name);
-+    return;
- }
- 
- bool Settings::isWSL1()
diff --git a/pkgs/tools/package-management/nix/enable-flakes.patch b/pkgs/tools/package-management/nix/enable-flakes.patch
deleted file mode 100644
index 998067449b7..00000000000
--- a/pkgs/tools/package-management/nix/enable-flakes.patch
+++ /dev/null
@@ -1,14 +0,0 @@
-diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
-index 3e4ead76c..81d407236 100644
---- a/src/libstore/globals.hh
-+++ b/src/libstore/globals.hh
-@@ -923,7 +923,8 @@ public:
-           value.
-           )"};
- 
--    Setting<Strings> experimentalFeatures{this, {}, "experimental-features",
-+    Setting<Strings> experimentalFeatures{
-+        this, {"flakes", "nix-command"}, "experimental-features",
-         "Experimental Nix features to enable."};
- 
-     bool isExperimentalFeatureEnabled(const std::string & name);
diff --git a/pkgs/tools/package-management/nixpkgs-review/default.nix b/pkgs/tools/package-management/nixpkgs-review/default.nix
index 2229e0c6a1d..3bfb89fe105 100644
--- a/pkgs/tools/package-management/nixpkgs-review/default.nix
+++ b/pkgs/tools/package-management/nixpkgs-review/default.nix
@@ -1,7 +1,7 @@
 { lib
 , python3
 , fetchFromGitHub
-, nixFlakes
+, nixUnstable
 , git
 }:
 
@@ -17,7 +17,7 @@ python3.pkgs.buildPythonApplication rec {
   };
 
   makeWrapperArgs = [
-    "--prefix" "PATH" ":" (lib.makeBinPath [ nixFlakes git ])
+    "--prefix" "PATH" ":" (lib.makeBinPath [ nixUnstable git ])
   ];
 
   doCheck = false;
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index a275fbd8057..6fddebdfc55 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -492,6 +492,7 @@ mapAliases ({
   nginxUnstable = nginxMainline; # added 2018-04-25
   nilfs_utils = nilfs-utils; # added 2018-04-25
   nix-review = nixpkgs-review; # added 2019-12-22
+  nixFlakes = nixUnstable; # added 2021-05-21
   nmap_graphical = nmap-graphical;  # added 2017-01-19
   nologin = shadow; # added 2018-04-25
   nxproxy = nx-libs; # added 2019-02-15
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3cb78b4c225..74ce21be654 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -30321,9 +30321,7 @@ in
       })
     nix
     nixStable
-    nixUnstable
-    nixFlakes
-    nixExperimental;
+    nixUnstable;
 
   nixStatic = pkgsStatic.nix;