diff --git a/README.md b/README.md
index d6b776d..18e61ee 100644
--- a/README.md
+++ b/README.md
@@ -242,7 +242,7 @@ JavaScript module (or make requests to an API service that renders them for you)
 ```javascript
 var slim = exports.slimjs || require("slimjs");
 function render(contentstr /*, desi*/) {
-  return PromiseA.resolve(slim(contentstr));
+  return Promise.resolve(slim(contentstr));
 }
 
 Desirae.registerRenderer(".slim", render);
diff --git a/lib/browser-adapters.js b/lib/browser-adapters.js
index 2af4666..e7d6127 100644
--- a/lib/browser-adapters.js
+++ b/lib/browser-adapters.js
@@ -5,7 +5,7 @@
   function create(Desi) {
     // Chrome, Firefox, and even MSIE11+ all support crypto
     var crypto = window.crypto || window.msCrypto,
-      PromiseA = window.Promise,
+      Promise = window.Promise,
       algos;
 
     // convenience mappings for common digest algorithms
@@ -111,7 +111,7 @@
     function request() {}
     request.get = function (url /*, query*/) {
       // Return a new promise.
-      return new PromiseA(function (resolve, reject) {
+      return new Promise(function (resolve, reject) {
         // Do the usual XHR stuff
         var req = new XMLHttpRequest();
         req.onload = function () {
@@ -139,7 +139,7 @@
     };
     request.post = function (url /*, query*/, body) {
       // Return a new promise.
-      return new PromiseA(function (resolve, reject) {
+      return new Promise(function (resolve, reject) {
         // Do the usual XHR stuff
         var req = new XMLHttpRequest();
         req.onload = function () {
diff --git a/lib/node-adapters/fsapi-real.js b/lib/node-adapters/fsapi-real.js
index 6c7c468..1b600ed 100644
--- a/lib/node-adapters/fsapi-real.js
+++ b/lib/node-adapters/fsapi-real.js
@@ -1,7 +1,7 @@
 "use strict";
 
-var PromiseA = require("bluebird").Promise,
-  fs = PromiseA.promisifyAll(require("fs"));
+var fs = require('fs').promises;
+
 function create(Desi, options) {
   var fsapi = Desi.fsapi;
   options.blogdir = options.blogdir || options.working_path;
@@ -35,7 +35,7 @@ function create(Desi, options) {
 
   fsapi.getCache = function () {
     return fs
-      .readFileAsync(options.blogdir, "/cache.json")
+      .readFile(options.blogdir, "/cache.json")
       .catch(function (/*e*/) {
         return {};
       })
diff --git a/lib/node-adapters/fsapi.js b/lib/node-adapters/fsapi.js
index 1de621b..8643a46 100644
--- a/lib/node-adapters/fsapi.js
+++ b/lib/node-adapters/fsapi.js
@@ -10,7 +10,7 @@ var safeResolve = require("../utils").safeResolve;
 var sha1sum = function (str) {
   return require("secret-utils").hashsum("sha1", str);
 };
-var fsExtra = PromiseA.promisifyAll(require("fs.extra"));
+var copyAll = require("util").promisify(require("fs.extra").copy);
 
 //, tmpdir        = require('os').tmpdir()
 function strip(prefix, pathname) {
@@ -48,7 +48,7 @@ function walkDir(parent, sub, opts) {
     return true;
   }
 
-  return new PromiseA(function (resolve) {
+  return new Promise(function (resolve) {
     var walker = walk.walk(trueRoot);
     walker.on("nodeError", function (filepath, stat, next) {
       //stats.forEach(function (stat) {
@@ -76,7 +76,7 @@ function walkDir(parent, sub, opts) {
         var file;
 
         if (!filter(stat.name)) {
-          return PromiseA.resolve();
+          return Promise.resolve();
         }
 
         file = {
@@ -93,12 +93,12 @@ function walkDir(parent, sub, opts) {
         files.push(file);
 
         if (!(opts.sha1sum || opts.content)) {
-          return PromiseA.resolve();
+          return Promise.resolve();
         }
 
         // TODO stream sha1 (for assets)
         return fs
-          .readFileAsync(path.join(root, stat.name), null)
+          .readFile(path.join(root, stat.name), null)
           .then(function (buffer) {
             var contents = buffer.toString("utf8");
             file.sha1 = sha1sum(contents);
@@ -144,7 +144,7 @@ function getfs(blogdir, filepaths) {
   return forEachAsync(filepaths, function (filepath) {
     var pathname = safeResolve(blogdir, filepath);
     return fs
-      .lstatAsync(pathname)
+      .lstat(pathname)
       .then(function (stat) {
         return fs.readFile(pathname, null).then(function (buffer) {
           files.push({
@@ -208,7 +208,7 @@ function copyfs(blogdir, files) {
     //, filename = path.basename(dest)
     dirpaths[pathname] = true;
 
-    return PromiseA.resolve();
+    return Promise.resolve();
   })
     .then(function () {
       // TODO is it better to do this lazy-like or as a batch?
@@ -223,8 +223,7 @@ function copyfs(blogdir, files) {
     .then(function () {
       // TODO allow delete?
       return forEachAsync(sources, function (source) {
-        return fsExtra
-          .copyAsync(
+        return copyAll(
             safeResolve(blogdir, source),
             safeResolve(blogdir, files[source]),
             { replace: true }
@@ -276,7 +275,7 @@ function putfs(blogdir, files, options) {
 
     dirpaths[pathname] = true;
 
-    return PromiseA.resolve();
+    return Promise.resolve();
   })
     .then(function () {
       // TODO is it better to do this lazy-like or as a batch?
@@ -304,13 +303,9 @@ function putfs(blogdir, files, options) {
       return forEachAsync(files, function (file) {
         // TODO use lastModifiedDate as per client request?
         // TODO compare sha1 sums for integrity
-        // NOTE existsAsync is backwards
         return fs
-          .existsAsync(file.realPath)
+          .access(file.realPath)
           .then(function () {
-            return fs.writeFile(file.realPath, file.contents, "utf8");
-          })
-          .catch(function (/*exists*/) {
             if (file.delete || !file.contents) {
               return fs.unlink(file.realPath);
             }
@@ -321,6 +316,9 @@ function putfs(blogdir, files, options) {
 
             return fs.writeFile(file.realPath, file.contents, "utf8");
           })
+          .catch(function () {
+            return fs.writeFile(file.realPath, file.contents, "utf8");
+          })
           .catch(function (e) {
             putfsResults.errors.push({
               type: "file",
diff --git a/lib/render-core.js b/lib/render-core.js
index f29a9bb..c8dc6d0 100644
--- a/lib/render-core.js
+++ b/lib/render-core.js
@@ -2,13 +2,12 @@
 (function (exports) {
   "use strict";
 
-  var PromiseA = exports.Promise || require("bluebird").Promise;
   function renderMd(contentstr /*, desi*/) {
     var markitdown = (exports.markdownit || require("markdown-it"))({
       html: true,
       linkify: true,
     });
-    return PromiseA.resolve(
+    return Promise.resolve(
       markitdown.render(contentstr)
       //.replace('"', '"')
       //.replace(''', "'")
@@ -18,7 +17,7 @@
 
   function renderNoop(contentstr /*, desi*/) {
     // hmmm... that was easy
-    return PromiseA.resolve(contentstr);
+    return Promise.resolve(contentstr);
   }
 
   function renderJade(contentstr, desi, options) {
@@ -30,7 +29,7 @@
     var jade = exports.jade || require("jade"),
       fn = jade.compile(contentstr, options),
       html = fn(desi);
-    return PromiseA.resolve(html);
+    return Promise.resolve(html);
   }
 
   exports.DesiraeRenderMarkdown = renderMd.DesiraeRenderMarkdown = renderMd;
diff --git a/package-lock.json b/package-lock.json
index ee9d3c5..fffc2b3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "desirae",
-  "version": "0.12.0",
+  "version": "0.12.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 1c33299..5572410 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "desirae",
-  "version": "0.12.0",
+  "version": "0.12.3",
   "description": "An in-browser static blog library and static site generator. Similar to Jekyll, Octopress, Nanoc, etc",
   "main": "desirae.js",
   "scripts": {