diff --git a/doc/builders/fetchers.chapter.md b/doc/builders/fetchers.chapter.md
index ba105764904..306b7c31c44 100644
--- a/doc/builders/fetchers.chapter.md
+++ b/doc/builders/fetchers.chapter.md
@@ -228,7 +228,7 @@ Otherwise, the builder will run, but fail with a message explaining to the user
 requireFile {
   name = "jdk-${version}_linux-x64_bin.tar.gz";
   url = "https://www.oracle.com/java/technologies/javase-jdk11-downloads.html";
-  sha256 = "94bd34f85ee38d3ef59e5289ec7450b9443b924c55625661fffe66b03f2c8de2";
+  hash = "sha256-lL00+F7jjT71nlKJ7HRQuUQ7kkxVYlZh//5msD8sjeI=";
 }
 ```
 results in this error message:
diff --git a/doc/languages-frameworks/dhall.section.md b/doc/languages-frameworks/dhall.section.md
index 846b8cfd316..1a209dbc068 100644
--- a/doc/languages-frameworks/dhall.section.md
+++ b/doc/languages-frameworks/dhall.section.md
@@ -91,7 +91,7 @@ buildDhallPackage {
 let
   nixpkgs = builtins.fetchTarball {
     url    = "https://github.com/NixOS/nixpkgs/archive/94b2848559b12a8ed1fe433084686b2a81123c99.tar.gz";
-    sha256 = "sha256-B4Q3c6IvTLg3Q92qYa8y+i4uTaphtFdjp+Ir3QQjdN0=";
+    hash = "sha256-B4Q3c6IvTLg3Q92qYa8y+i4uTaphtFdjp+Ir3QQjdN0=";
   };
 
   dhallOverlay = self: super: {
diff --git a/doc/languages-frameworks/rust.section.md b/doc/languages-frameworks/rust.section.md
index 08738026447..67e23cc74d4 100644
--- a/doc/languages-frameworks/rust.section.md
+++ b/doc/languages-frameworks/rust.section.md
@@ -102,7 +102,7 @@ rustPlatform.buildRustPackage rec {
 
   src = fetchCrate {
     inherit pname version;
-    sha256 = "sha256-aDQA4A5mScX9or3Lyiv/5GyAehidnpKKE0grhbP1Ctc=";
+    hash = "sha256-aDQA4A5mScX9or3Lyiv/5GyAehidnpKKE0grhbP1Ctc=";
   };
 
   cargoHash = "sha256-tbrTbutUs5aPSV+yE0IBUZAAytgmZV7Eqxia7g+9zRs=";
diff --git a/doc/stdenv/stdenv.chapter.md b/doc/stdenv/stdenv.chapter.md
index fe0f5daf7a0..0526f8aa9c6 100644
--- a/doc/stdenv/stdenv.chapter.md
+++ b/doc/stdenv/stdenv.chapter.md
@@ -180,7 +180,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "https://github.com/Solo5/solo5/releases/download/v${version}/solo5-v${version}.tar.gz";
-    sha256 = "sha256-viwrS9lnaU8sTGuzK/+L/PlMM/xRRtgVuK5pixVeDEw=";
+    hash = "sha256-viwrS9lnaU8sTGuzK/+L/PlMM/xRRtgVuK5pixVeDEw=";
   };
 
   nativeBuildInputs = [ makeWrapper pkg-config ];
diff --git a/lib/customisation.nix b/lib/customisation.nix
index 0d023aa361c..ec2513021f9 100644
--- a/lib/customisation.nix
+++ b/lib/customisation.nix
@@ -19,7 +19,7 @@ rec {
          name = "sed-4.2.2-pre";
          src = fetchurl {
            url = ftp://alpha.gnu.org/gnu/sed/sed-4.2.2-pre.tar.bz2;
-           sha256 = "11nq06d131y4wmf3drm0yk502d2xc6n5qy82cg88rb9nqd2lj41k";
+           hash = "sha256-MxBJRcM2rYzQYwJ5XKxhXTQByvSg5jZc5cSHEZoB2IY=";
          };
          patches = [];
        });
diff --git a/nixos/doc/manual/configuration/adding-custom-packages.section.md b/nixos/doc/manual/configuration/adding-custom-packages.section.md
index 89d32955061..2340723e07c 100644
--- a/nixos/doc/manual/configuration/adding-custom-packages.section.md
+++ b/nixos/doc/manual/configuration/adding-custom-packages.section.md
@@ -44,7 +44,7 @@ environment.systemPackages =
       name = "hello-2.8";
       src = fetchurl {
         url = "mirror://gnu/hello/${name}.tar.gz";
-        sha256 = "0wqd8sjmxfskrflaxywc7gqw7sfawrfvdxd9skxawzfgyy0pzdz6";
+        hash = "sha256-5rd/gffPfa761Kn1tl3myunD8TuM+66oy1O7XqVGDXM=";
       };
     };
   in
@@ -67,7 +67,7 @@ stdenv.mkDerivation rec {
   name = "hello-2.8";
   src = fetchurl {
     url = "mirror://gnu/hello/${name}.tar.gz";
-    sha256 = "0wqd8sjmxfskrflaxywc7gqw7sfawrfvdxd9skxawzfgyy0pzdz6";
+    hash = "sha256-5rd/gffPfa761Kn1tl3myunD8TuM+66oy1O7XqVGDXM=";
   };
 }
 ```