diff --git a/lib/keymap-helpers.nix b/lib/keymap-helpers.nix
index e1e5f2ca..69ffbef2 100644
--- a/lib/keymap-helpers.nix
+++ b/lib/keymap-helpers.nix
@@ -79,63 +79,43 @@ in rec {
 
   # TODO: When `maps` will have to be deprecated (early December 2023), change this.
   # mapOptionSubmodule = {...} (no need for options... except for 'optionalAction')
-  mkMapOptionSubmodule = {
-    defaultMode ? "",
-    withKeyOpt ? true,
-    flatConfig ? false,
-  }:
-    with types; let
-      mapOptionSubmodule = submodule {
-        options =
-          (
-            if withKeyOpt
-            then {
-              key = mkOption {
-                type = str;
-                description = "The key to map.";
-                example = "<C-m>";
-              };
-            }
-            else {}
-          )
-          // {
-            mode = mkOption {
-              type = either modeEnum (listOf modeEnum);
-              description = ''
-                One or several modes.
-                Use the short-names (`"n"`, `"v"`, ...).
-                See `:h map-modes` to learn more.
-              '';
-              default = defaultMode;
-              example = ["n" "v"];
-            };
+  mapOptionSubmodule = with types;
+    submodule {
+      options = {
+        key = mkOption {
+          type = str;
+          description = "The key to map.";
+          example = "<C-m>";
+        };
 
-            action = mkOption {
-              type = str;
-              description = "The action to execute.";
-            };
+        mode = mkOption {
+          type = either modeEnum (listOf modeEnum);
+          description = ''
+            One or several modes.
+            Use the short-names (`"n"`, `"v"`, ...).
+            See `:h map-modes` to learn more.
+          '';
+          default = "";
+          example = ["n" "v"];
+        };
 
-            lua = mkOption {
-              type = bool;
-              description = ''
-                If true, `action` is considered to be lua code.
-                Thus, it will not be wrapped in `""`.
-              '';
-              default = false;
-            };
-          }
-          // (
-            if flatConfig
-            then mapConfigOptions
-            else {
-              options = mapConfigOptions;
-            }
-          );
+        action = mkOption {
+          type = str;
+          description = "The action to execute.";
+        };
+
+        lua = mkOption {
+          type = bool;
+          description = ''
+            If true, `action` is considered to be lua code.
+            Thus, it will not be wrapped in `""`.
+          '';
+          default = false;
+        };
+
+        options = mapConfigOptions;
       };
-    in
-      if flatConfig
-      then either str mapOptionSubmodule
-      else mapOptionSubmodule;
+    };
 
   # Correctly merge two attrs (partially) representing a mapping.
   mergeKeymap = defaults: keymap: let
@@ -145,56 +125,6 @@ in rec {
     # Then, merge the root attrs together and add the previously merged `options` attrs.
     (defaults // keymap) // {options = mergedOpts;};
 
-  # Given an attrs of key mappings (for a single mode), applies the defaults to each one of them.
-  #
-  # Example:
-  # mkModeMaps { silent = true; } {
-  #   Y = "y$";
-  #   "<C-c>" = { action = ":b#<CR>"; silent = false; };
-  # };
-  #
-  # would give:
-  # {
-  #   Y = {
-  #     action = "y$";
-  #     silent = true;
-  #   };
-  #   "<C-c>" = {
-  #     action = ":b#<CR>";
-  #     silent = false;
-  #   };
-  # };
-  mkModeMaps = defaults:
-    mapAttrs
-    (
-      key: action: let
-        actionAttrs =
-          if isString action
-          then {inherit action;}
-          else action;
-      in
-        defaults // actionAttrs
-    );
-
-  # Applies some default mapping options to a set of mappings
-  #
-  # Example:
-  #   maps = mkMaps { silent = true; expr = true; } {
-  #     normal = {
-  #       ...
-  #     };
-  #     visual = {
-  #       ...
-  #     };
-  #   }
-  mkMaps = defaults:
-    mapAttrs
-    (
-      name: modeMaps:
-        mkModeMaps defaults modeMaps
-    );
-
-  # TODO deprecate `mkMaps` and `mkModeMaps` and leave only this one
   mkKeymaps = defaults:
     map
     (mergeKeymap defaults);
diff --git a/modules/keymaps.nix b/modules/keymaps.nix
index 4a895c08..b6c73fa6 100644
--- a/modules/keymaps.nix
+++ b/modules/keymaps.nix
@@ -5,59 +5,11 @@
   ...
 }:
 with lib; {
-  options = {
-    maps =
-      mapAttrs
-      (
-        modeName: modeProps: let
-          desc = modeProps.desc or modeName;
-        in
-          mkOption {
-            description = "Mappings for ${desc} mode";
-            type = with types;
-              attrsOf
-              (
-                either
-                str
-                (
-                  helpers.keymaps.mkMapOptionSubmodule
-                  {
-                    defaultMode = modeProps.short;
-                    withKeyOpt = false;
-                    flatConfig = true;
-                  }
-                )
-              );
-            default = {};
-          }
-      )
-      helpers.keymaps.modes;
-
-    keymaps = mkOption {
-      type =
-        types.listOf
-        (helpers.keymaps.mkMapOptionSubmodule {});
-      default = [];
-      example = [
-        {
-          key = "<C-m>";
-          action = "<cmd>make<CR>";
-          options.silent = true;
-        }
-      ];
-    };
-  };
-
-  config = {
-    warnings =
-      optional
-      (
-        any
-        (modeMaps: modeMaps != {})
-        (attrValues config.maps)
-      )
+  # This warning has been added on 2023-12-02. TODO: remove it in early Feb. 2024.
+  imports = [
+    (mkRemovedOptionModule
+      ["maps"]
       ''
-        The `maps` option will be deprecated in the near future.
         Please, use the new `keymaps` option which works as follows:
 
         keymaps = [
@@ -79,66 +31,42 @@ with lib; {
             };
           }
         ];
-      '';
+      '')
+  ];
 
+  options = {
+    keymaps = mkOption {
+      type =
+        types.listOf
+        helpers.keymaps.mapOptionSubmodule;
+      default = [];
+      example = [
+        {
+          key = "<C-m>";
+          action = "<cmd>make<CR>";
+          options.silent = true;
+        }
+      ];
+    };
+  };
+
+  config = {
     extraConfigLua = let
-      modeMapsAsList =
-        flatten
-        (
-          mapAttrsToList
-          (
-            modeOptionName: modeProps:
-              mapAttrsToList
-              (
-                key: action:
-                  (
-                    if isString action
-                    then {
-                      mode = modeProps.short;
-                      inherit action;
-                      lua = false;
-                      options = {};
-                    }
-                    else
-                      {
-                        inherit
-                          (action)
-                          action
-                          lua
-                          mode
-                          ;
-                      }
-                      // {
-                        options =
-                          getAttrs
-                          (attrNames helpers.keymaps.mapConfigOptions)
-                          action;
-                      }
-                  )
-                  // {inherit key;}
-              )
-              config.maps.${modeOptionName}
-          )
-          helpers.keymaps.modes
-        );
+      normalizeMapping = keyMapping: {
+        inherit
+          (keyMapping)
+          mode
+          key
+          options
+          ;
 
-      mappings = let
-        normalizeMapping = keyMapping: {
-          inherit
-            (keyMapping)
-            mode
-            key
-            options
-            ;
+        action =
+          if keyMapping.lua
+          then helpers.mkRaw keyMapping.action
+          else keyMapping.action;
+      };
 
-          action =
-            if keyMapping.lua
-            then helpers.mkRaw keyMapping.action
-            else keyMapping.action;
-        };
-      in
-        map normalizeMapping
-        (config.keymaps ++ modeMapsAsList);
+      mappings = map normalizeMapping config.keymaps;
     in
       optionalString (mappings != [])
       ''
diff --git a/tests/test-sources/modules/keymaps.nix b/tests/test-sources/modules/keymaps.nix
index 7c437b29..9afa0de0 100644
--- a/tests/test-sources/modules/keymaps.nix
+++ b/tests/test-sources/modules/keymaps.nix
@@ -1,38 +1,4 @@
 {helpers, ...}: {
-  legacy = {
-    maps.normal."," = "<cmd>echo \"test\"<cr>";
-  };
-
-  legacy-mkMaps = {
-    maps = helpers.keymaps.mkMaps {silent = true;} {
-      normal."," = "<cmd>echo \"test\"<cr>";
-      visual = {
-        "<C-a>" = {
-          action = "function() print('toto') end";
-          lua = true;
-          silent = false;
-        };
-        "<C-z>" = {
-          action = "bar";
-        };
-      };
-    };
-  };
-
-  legacy-mkModeMaps = {
-    maps.normal = helpers.keymaps.mkModeMaps {silent = true;} {
-      "," = "<cmd>echo \"test\"<cr>";
-      "<C-a>" = {
-        action = "function() print('toto') end";
-        lua = true;
-        silent = false;
-      };
-      "<leader>b" = {
-        action = "bar";
-      };
-    };
-  };
-
   example = {
     keymaps = [
       {
@@ -47,7 +13,7 @@
     ];
   };
 
-  mkMaps = {
+  mkKeymaps = {
     keymaps =
       helpers.keymaps.mkKeymaps
       {