diff --git a/flake.nix b/flake.nix
index 50c4504..dc9e417 100644
--- a/flake.nix
+++ b/flake.nix
@@ -152,9 +152,11 @@
           };
           optionsDoc = doclib.mkOptionDocs {
             module = {
-              _module.args.pkgs = pkgs;
               imports = [
                 nblib.module
+                {
+                  _module.args.pkgs = pkgs;
+                }
               ];
             };
             roots = [
diff --git a/lib/ansible-core.nix b/lib/ansible-core.nix
index dfa3cbc..85c7de1 100644
--- a/lib/ansible-core.nix
+++ b/lib/ansible-core.nix
@@ -26,27 +26,32 @@
 }:
 buildPythonPackage rec {
   pname = "ansible-core";
-  version = "2.19.2";
+  version = "2.18.6";
   pyproject = true;
 
   src = fetchPypi {
     pname = "ansible_core";
     inherit version;
-    hash = "sha256-h/y7xJLtFutq2wN5uuCtv2nzzoioRA5+iODc76n4pUw=";
+    hash = "sha256-JbsgzhUWobcweDGyY872hAQ7NyBxFGa9nUFk5f1XZVc=";
   };
 
   # ansible_connection is already wrapped, so don't pass it through
   # the python interpreter again, as it would break execution of
   # connection plugins.
   postPatch = ''
+    substituteInPlace lib/ansible/executor/task_executor.py \
+      --replace "[python," "["
+
     patchShebangs --build packaging/cli-doc/build.py
 
     SETUPTOOLS_PATTERN='"setuptools[0-9 <>=.,]+"'
-    WHEEL_PATTERN='"wheel[0-9 <>=.,]+"'
-    echo "Patching pyproject.toml"
-    # print replaced patterns to stdout
-    sed -r -i -e 's/'"$SETUPTOOLS_PATTERN"'/"setuptools"/w /dev/stdout' \
-    -e 's/'"$WHEEL_PATTERN"'/"wheel"/w /dev/stdout' pyproject.toml
+    PYPROJECT=$(cat pyproject.toml)
+    if [[ "$PYPROJECT" =~ $SETUPTOOLS_PATTERN ]]; then
+      echo "setuptools replace: ''${BASH_REMATCH[0]}"
+      echo "''${PYPROJECT//''${BASH_REMATCH[0]}/'"setuptools"'}" > pyproject.toml
+    else
+      exit 2
+    fi
   '';
 
   nativeBuildInputs = [
@@ -81,12 +86,6 @@ buildPythonPackage rec {
 
   pythonRelaxDeps = ["resolvelib"];
 
-  postInstall = ''
-    export HOME="$(mktemp -d)"
-    packaging/cli-doc/build.py man --output-dir=man
-    installManPage man/*
-  '';
-
   # internal import errors, missing dependencies
   doCheck = false;
 }
diff --git a/lib/module.nix b/lib/module.nix
index 5624d58..bcbe713 100644
--- a/lib/module.nix
+++ b/lib/module.nix
@@ -19,7 +19,7 @@
   unsetOr = typ:
     (types.either unsetType typ)
     // {
-      inherit (typ) description getSubOptions;
+      description = typ.description;
     };
 
   filterUnset = value:
@@ -36,7 +36,7 @@
     mkOption args
     // {
       type = unsetOr args.type;
-      default = args.default or unset;
+      default = unset;
       defaultText = literalExpression "unset";
     };
 
@@ -59,7 +59,7 @@
     };
   };
   tasksType = types.submodule {
-    freeformType = types.attrsOf types.anything;
+    freeformType = types.attrsOf (types.attrsOf types.anything);
     options = {
       name = mkUnsetOption {
         type = types.str;
@@ -118,7 +118,7 @@
     };
   };
   playType = types.submodule {
-    freeformType = types.attrsOf types.anything;
+    freeformType = types.attrsOf (types.attrsOf types.anything);
     options = {
       name = mkOption {
         type = types.str;
@@ -278,17 +278,12 @@ in {
     cli = pkgs.writeShellApplication {
       name = "nixible";
       runtimeInputs = config.dependencies;
-      text = let
-        inventoryStr =
-          if config.inventory != {}
-          then "-i ${config.inventoryFile}"
-          else "";
-      in ''
+      text = ''
         set -euo pipefail
         export ANSIBLE_COLLECTIONS_PATH=${config.installedCollections}
 
         git_repo=$(git rev-parse --show-toplevel 2>/dev/null || true)
-        ${config.ansiblePackage}/bin/ansible-playbook ${inventoryStr} ${config.playbookFile} -e "pwd=$(pwd)" -e "git_root=$git_repo" "$@"
+        ${config.ansiblePackage}/bin/ansible-playbook -i ${config.inventoryFile} ${config.playbookFile} -e "pwd=$(pwd)" -e "git_root=$git_repo" "$@"
       '';
     };
   };