diff --git a/README.md b/README.md
index 75ab5cf..7f12f51 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ for example:
 
 {
   environment.packages = [ pkgs.vim ];
-  system.stateVersion = "19.09";
+  system.stateVersion = "20.03";
 }
 ```
 
@@ -66,7 +66,7 @@ An alternative location is `~/.config/nixpkgs/config.nix` with the key
 
     {
       environment.packages = [ pkgs.vim ];
-      system.stateVersion = "19.09";
+      system.stateVersion = "20.03";
     };
 }
 ```
@@ -80,7 +80,7 @@ To enable `home-manager` you simply need to follow the instructions already prov
 
 1.  Add `home-manager` channel:
     ```
-    nix-channel --add https://github.com/rycee/home-manager/archive/release-19.09.tar.gz home-manager
+    nix-channel --add https://github.com/rycee/home-manager/archive/release-20.03.tar.gz home-manager
     nix-channel --update
     ```
 2.  Configure `home-manager`:
diff --git a/default.nix b/default.nix
index 26153e5..3b0569c 100644
--- a/default.nix
+++ b/default.nix
@@ -25,8 +25,8 @@ rec {
       is present) there is one manual step necessary *before* running the migration script: Remove basic-environment \
       package of 'home.packages' list."
       echo
-      echo "Recommended: change home-manager channel to release-19.09:"
-      echo "  nix-channel --add https://github.com/rycee/home-manager/archive/release-19.09.tar.gz home-manager"
+      echo "Recommended: change home-manager channel to release-20.03:"
+      echo "  nix-channel --add https://github.com/rycee/home-manager/archive/release-20.03.tar.gz home-manager"
       echo
       echo "Recommended: set nix-on-droid channel to a505862"
       echo "  nix-channel --add https://github.com/t184256/nix-on-droid/archive/pre-module-system.tar.gz nix-on-droid"
@@ -75,10 +75,10 @@ rec {
             ${pkgs.patch}/bin/patch --no-backup-if-mismatch $HOME/.config/nixpkgs/nix-on-droid.nix ${pkgs.writeText "patch" ''
               @@ -27,15 +27,9 @@
                  # Read the changelog before changing this value
-                 system.stateVersion = "19.09";
+                 system.stateVersion = "20.03";
 
               -  # After installing home-manager channel like
-              -  #   nix-channel --add https://github.com/rycee/home-manager/archive/release-19.09.tar.gz home-manager
+              -  #   nix-channel --add https://github.com/rycee/home-manager/archive/release-20.03.tar.gz home-manager
               -  #   nix-channel --update
               -  # you can configure home-manager in here like
               -  #home-manager.config =
@@ -97,10 +97,10 @@ rec {
             ${pkgs.patch}/bin/patch --no-backup-if-mismatch $HOME/.config/nixpkgs/nix-on-droid.nix ${pkgs.writeText "patch" ''
               @@ -27,15 +27,9 @@
                  # Read the changelog before changing this value
-                 system.stateVersion = "19.09";
+                 system.stateVersion = "20.03";
 
               -  # After installing home-manager channel like
-              -  #   nix-channel --add https://github.com/rycee/home-manager/archive/release-19.09.tar.gz home-manager
+              -  #   nix-channel --add https://github.com/rycee/home-manager/archive/release-20.03.tar.gz home-manager
               -  #   nix-channel --update
               -  # you can configure home-manager in here like
               -  #home-manager.config =
diff --git a/modules/build/initial-build.nix b/modules/build/initial-build.nix
index b84d31c..843da28 100644
--- a/modules/build/initial-build.nix
+++ b/modules/build/initial-build.nix
@@ -13,7 +13,7 @@ with lib;
     build.channel = {
       nixpkgs = mkOption {
         type = types.str;
-        default = "https://nixos.org/channels/nixos-19.09";
+        default = "https://nixos.org/channels/nixos-20.03";
         description = "Channel URL for nixpkgs.";
       };
 
diff --git a/modules/environment/login/nix-on-droid.nix.default b/modules/environment/login/nix-on-droid.nix.default
index d007f03..e76ccde 100644
--- a/modules/environment/login/nix-on-droid.nix.default
+++ b/modules/environment/login/nix-on-droid.nix.default
@@ -28,10 +28,10 @@
   environment.etcBackupExtension = ".bak";
 
   # Read the changelog before changing this value
-  system.stateVersion = "19.09";
+  system.stateVersion = "20.03";
 
   # After installing home-manager channel like
-  #   nix-channel --add https://github.com/rycee/home-manager/archive/release-19.09.tar.gz home-manager
+  #   nix-channel --add https://github.com/rycee/home-manager/archive/release-20.03.tar.gz home-manager
   #   nix-channel --update
   # you can configure home-manager in here like
   #home-manager.config =