diff --git a/package.json b/package.json
index 95a9030..c9e6d6f 100644
--- a/package.json
+++ b/package.json
@@ -66,7 +66,6 @@
 		"html-minifier": "^3.5.15",
 		"markdown-to-jsx": "^6.6.2",
 		"minimist": "^1.2.0",
-		"nodegit": "^0.22.0",
 		"progress": "^2.0.0",
 		"prop-types": "^15.6.1",
 		"react": "^16.3.2",
@@ -75,6 +74,7 @@
 		"react-interface": "^0.9.8",
 		"react-router-dom": "^4.2.2",
 		"react-syntax-highlighter": "^7.0.4",
+		"simple-git": "^1.92.0",
 		"tmp": "^0.0.33",
 		"webpack": "^4.8.1",
 		"webpack-dev-middleware": "^3.1.3",
diff --git a/src/core/externals.js b/src/core/externals.js
index f85eb55..616db0a 100644
--- a/src/core/externals.js
+++ b/src/core/externals.js
@@ -1,6 +1,6 @@
 const fs = require('fs-extra')
 const path = require('path')
-const git = require('nodegit')
+const git = require('simple-git/promise')
 const { log, warn, error } = require('../utils/emit')
 
 // Warnings for missing source information
@@ -17,12 +17,6 @@ const defaults = {
   root: 'docs/'
 }
 
-function checkoutBranch (repo, source) {
-  return repo
-    .getBranch(`refs/remotes/origin/${source.branch}`)
-    .then(b => repo.checkoutRef(b))
-}
-
 function cloneExternals (dir, sources) {
   // Ensure the tmp directory is cleared out
   fs.emptyDirSync(dir)
@@ -39,9 +33,14 @@ function cloneExternals (dir, sources) {
     // Override defaults with source config
     const source = { ...defaults, ...s }
 
+    // Target directory for the cloned repo
+    const target = `${dir}/${source.name}`
+
     // Clone the source folder to our tmp directory
-    const repo = await git.Clone(source.url, `${dir}/${source.name}`)
-    return checkoutBranch(repo, source)
+    await git().clone(source.url, target)
+
+    // Ensure the proper branch is checked out
+    return git(target).checkout(source.branch)
   })
 
   // Wait for all cloning to finish
diff --git a/yarn.lock b/yarn.lock
index 7533617..2c7ec90 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1295,12 +1295,6 @@ binary-extensions@^1.0.0:
   version "1.11.0"
   resolved "https://registry.yarnpkg.com/binary-extensions/-/binary-extensions-1.11.0.tgz#46aa1751fb6a2f93ee5e689bb1087d4b14c6c205"
 
-block-stream@*:
-  version "0.0.9"
-  resolved "https://registry.yarnpkg.com/block-stream/-/block-stream-0.0.9.tgz#13ebfe778a03205cfe03751481ebb4b3300c126a"
-  dependencies:
-    inherits "~2.0.0"
-
 bluebird@^3.0.0, bluebird@^3.5.1:
   version "3.5.1"
   resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.1.tgz#d9551f9de98f1fcda1e683d17ee91a0602ee2eb9"
@@ -3023,16 +3017,6 @@ fs-extra@^6.0.0:
     jsonfile "^4.0.0"
     universalify "^0.1.0"
 
-fs-extra@~0.27.0:
-  version "0.27.0"
-  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-0.27.0.tgz#66d4c25d1d2c6a8dafed7718cfcffe930f13b2c0"
-  dependencies:
-    graceful-fs "^4.1.2"
-    jsonfile "^2.1.0"
-    klaw "^1.0.0"
-    path-is-absolute "^1.0.0"
-    rimraf "^2.2.8"
-
 fs-minipass@^1.2.5:
   version "1.2.5"
   resolved "https://registry.yarnpkg.com/fs-minipass/-/fs-minipass-1.2.5.tgz#06c277218454ec288df77ada54a03b8702aacb9d"
@@ -3059,23 +3043,6 @@ fsevents@^1.0.0, fsevents@^1.1.2:
     nan "^2.9.2"
     node-pre-gyp "^0.9.0"
 
-fstream-ignore@^1.0.5:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/fstream-ignore/-/fstream-ignore-1.0.5.tgz#9c31dae34767018fe1d249b24dada67d092da105"
-  dependencies:
-    fstream "^1.0.0"
-    inherits "2"
-    minimatch "^3.0.0"
-
-fstream@^1.0.0, fstream@^1.0.10, fstream@^1.0.2:
-  version "1.0.11"
-  resolved "https://registry.yarnpkg.com/fstream/-/fstream-1.0.11.tgz#5c1fb1f117477114f0632a0eb4b71b3cb0fd3171"
-  dependencies:
-    graceful-fs "^4.1.2"
-    inherits "~2.0.0"
-    mkdirp ">=0.5 0"
-    rimraf "2"
-
 function-bind@^1.0.2, function-bind@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/function-bind/-/function-bind-1.1.1.tgz#a56899d3ea3c9bab874bb9773b7c5ede92f4895d"
@@ -3225,7 +3192,7 @@ got@^6.7.1:
     unzip-response "^2.0.1"
     url-parse-lax "^1.0.0"
 
-graceful-fs@^4.1.11, graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.1.9:
+graceful-fs@^4.1.11, graceful-fs@^4.1.2, graceful-fs@^4.1.6:
   version "4.1.11"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
 
@@ -3373,7 +3340,7 @@ hastscript@^3.1.0:
     property-information "^3.0.0"
     space-separated-tokens "^1.0.0"
 
-hawk@3.1.3, hawk@~3.1.3:
+hawk@~3.1.3:
   version "3.1.3"
   resolved "https://registry.yarnpkg.com/hawk/-/hawk-3.1.3.tgz#078444bd7c1640b0fe540d2c9b73d59678e8e1c4"
   dependencies:
@@ -3571,7 +3538,7 @@ inflight@^1.0.4:
     once "^1.3.0"
     wrappy "1"
 
-inherits@2, inherits@^2.0.1, inherits@^2.0.3, inherits@~2.0.0, inherits@~2.0.1, inherits@~2.0.3:
+inherits@2, inherits@^2.0.1, inherits@^2.0.3, inherits@~2.0.1, inherits@~2.0.3:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
 
@@ -4041,12 +4008,6 @@ json5@^0.5.0, json5@^0.5.1:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/json5/-/json5-0.5.1.tgz#1eade7acc012034ad84e2396767ead9fa5495821"
 
-jsonfile@^2.1.0:
-  version "2.4.0"
-  resolved "https://registry.yarnpkg.com/jsonfile/-/jsonfile-2.4.0.tgz#3736a2b428b87bbda0cc83b53fa3d633a35c2ae8"
-  optionalDependencies:
-    graceful-fs "^4.1.6"
-
 jsonfile@^3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/jsonfile/-/jsonfile-3.0.1.tgz#a5ecc6f65f53f662c4415c7675a0331d0992ec66"
@@ -4102,12 +4063,6 @@ kind-of@^6.0.0, kind-of@^6.0.2:
   version "6.0.2"
   resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-6.0.2.tgz#01146b36a6218e64e58f3a8d66de5d7fc6f6d051"
 
-klaw@^1.0.0:
-  version "1.3.1"
-  resolved "https://registry.yarnpkg.com/klaw/-/klaw-1.3.1.tgz#4088433b46b3b1ba259d78785d8e96f73ba02439"
-  optionalDependencies:
-    graceful-fs "^4.1.9"
-
 last-line-stream@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/last-line-stream/-/last-line-stream-1.0.0.tgz#d1b64d69f86ff24af2d04883a2ceee14520a5600"
@@ -4228,7 +4183,7 @@ lodash.merge@^4.6.0:
   version "4.6.1"
   resolved "https://registry.yarnpkg.com/lodash.merge/-/lodash.merge-4.6.1.tgz#adc25d9cb99b9391c59624f379fbba60d7111d54"
 
-lodash@^4.13.1, lodash@^4.17.4, lodash@^4.2.0, lodash@^4.3.0:
+lodash@^4.17.4, lodash@^4.2.0, lodash@^4.3.0:
   version "4.17.10"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
 
@@ -4520,7 +4475,7 @@ mixin-deep@^1.2.0:
     for-in "^1.0.2"
     is-extendable "^1.0.1"
 
-"mkdirp@>=0.5 0", mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.0:
+mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.0:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
   dependencies:
@@ -4569,7 +4524,7 @@ mute-stream@0.0.7:
   version "0.0.7"
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.7.tgz#3075ce93bc21b8fab43e1bc4da7e8115ed1e7bab"
 
-nan@^2.10.0, nan@^2.9.2:
+nan@^2.9.2:
   version "2.10.0"
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.10.0.tgz#96d0cd610ebd58d4b4de9cc0c6828cda99c7548f"
 
@@ -4637,24 +4592,6 @@ node-fetch@^1.0.1:
     encoding "^0.1.11"
     is-stream "^1.0.1"
 
-node-gyp@^3.6.2:
-  version "3.6.2"
-  resolved "https://registry.yarnpkg.com/node-gyp/-/node-gyp-3.6.2.tgz#9bfbe54562286284838e750eac05295853fa1c60"
-  dependencies:
-    fstream "^1.0.0"
-    glob "^7.0.3"
-    graceful-fs "^4.1.2"
-    minimatch "^3.0.2"
-    mkdirp "^0.5.0"
-    nopt "2 || 3"
-    npmlog "0 || 1 || 2 || 3 || 4"
-    osenv "0"
-    request "2"
-    rimraf "2"
-    semver "~5.3.0"
-    tar "^2.0.0"
-    which "1"
-
 node-libs-browser@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/node-libs-browser/-/node-libs-browser-2.1.0.tgz#5f94263d404f6e44767d726901fff05478d600df"
@@ -4698,45 +4635,6 @@ node-pre-gyp@^0.9.0:
     semver "^5.3.0"
     tar "^4"
 
-node-pre-gyp@~0.6.39:
-  version "0.6.39"
-  resolved "https://registry.yarnpkg.com/node-pre-gyp/-/node-pre-gyp-0.6.39.tgz#c00e96860b23c0e1420ac7befc5044e1d78d8649"
-  dependencies:
-    detect-libc "^1.0.2"
-    hawk "3.1.3"
-    mkdirp "^0.5.1"
-    nopt "^4.0.1"
-    npmlog "^4.0.2"
-    rc "^1.1.7"
-    request "2.81.0"
-    rimraf "^2.6.1"
-    semver "^5.3.0"
-    tar "^2.2.1"
-    tar-pack "^3.4.0"
-
-nodegit-promise@~4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/nodegit-promise/-/nodegit-promise-4.0.0.tgz#5722b184f2df7327161064a791d2e842c9167b34"
-  dependencies:
-    asap "~2.0.3"
-
-nodegit@^0.22.0:
-  version "0.22.0"
-  resolved "https://registry.yarnpkg.com/nodegit/-/nodegit-0.22.0.tgz#3b49f732f6c19091f05563f2cd7307871ee1973c"
-  dependencies:
-    fs-extra "~0.27.0"
-    lodash "^4.13.1"
-    nan "^2.10.0"
-    node-gyp "^3.6.2"
-    node-pre-gyp "~0.6.39"
-    promisify-node "~0.3.0"
-
-"nopt@2 || 3":
-  version "3.0.6"
-  resolved "https://registry.yarnpkg.com/nopt/-/nopt-3.0.6.tgz#c6465dbf08abcd4db359317f79ac68a646b28ff9"
-  dependencies:
-    abbrev "1"
-
 nopt@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/nopt/-/nopt-4.0.1.tgz#d0d4685afd5415193c8c7505602d0d17cd64474d"
@@ -4790,7 +4688,7 @@ npm-run-path@^2.0.0:
   dependencies:
     path-key "^2.0.0"
 
-"npmlog@0 || 1 || 2 || 3 || 4", npmlog@^4.0.2:
+npmlog@^4.0.2:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/npmlog/-/npmlog-4.1.2.tgz#08a7f2a8bf734604779a9efa4ad5cc717abb954b"
   dependencies:
@@ -4896,7 +4794,7 @@ on-finished@~2.3.0:
   dependencies:
     ee-first "1.1.1"
 
-once@^1.3.0, once@^1.3.1, once@^1.3.3, once@^1.4.0:
+once@^1.3.0, once@^1.3.1, once@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/once/-/once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"
   dependencies:
@@ -4950,7 +4848,7 @@ os-tmpdir@^1.0.0, os-tmpdir@^1.0.1, os-tmpdir@~1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
 
-osenv@0, osenv@^0.1.4:
+osenv@^0.1.4:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/osenv/-/osenv-0.1.5.tgz#85cdfafaeb28e8677f416e287592b5f3f49ea410"
   dependencies:
@@ -5317,12 +5215,6 @@ promise@^7.1.1:
   dependencies:
     asap "~2.0.3"
 
-promisify-node@~0.3.0:
-  version "0.3.0"
-  resolved "https://registry.yarnpkg.com/promisify-node/-/promisify-node-0.3.0.tgz#b4b55acf90faa7d2b8b90ca396899086c03060cf"
-  dependencies:
-    nodegit-promise "~4.0.0"
-
 prop-types@^15.5.10, prop-types@^15.5.4, prop-types@^15.6.0, prop-types@^15.6.1:
   version "15.6.1"
   resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.6.1.tgz#36644453564255ddda391191fb3a125cbdf654ca"
@@ -5725,33 +5617,6 @@ request-progress@3.0.0:
   dependencies:
     throttleit "^1.0.0"
 
-request@2, request@^2.79.0:
-  version "2.85.0"
-  resolved "https://registry.yarnpkg.com/request/-/request-2.85.0.tgz#5a03615a47c61420b3eb99b7dba204f83603e1fa"
-  dependencies:
-    aws-sign2 "~0.7.0"
-    aws4 "^1.6.0"
-    caseless "~0.12.0"
-    combined-stream "~1.0.5"
-    extend "~3.0.1"
-    forever-agent "~0.6.1"
-    form-data "~2.3.1"
-    har-validator "~5.0.3"
-    hawk "~6.0.2"
-    http-signature "~1.2.0"
-    is-typedarray "~1.0.0"
-    isstream "~0.1.2"
-    json-stringify-safe "~5.0.1"
-    mime-types "~2.1.17"
-    oauth-sign "~0.8.2"
-    performance-now "^2.1.0"
-    qs "~6.5.1"
-    safe-buffer "^5.1.1"
-    stringstream "~0.0.5"
-    tough-cookie "~2.3.3"
-    tunnel-agent "^0.6.0"
-    uuid "^3.1.0"
-
 request@2.81.0:
   version "2.81.0"
   resolved "https://registry.yarnpkg.com/request/-/request-2.81.0.tgz#c6928946a0e06c5f8d6f8a9333469ffda46298a0"
@@ -5779,6 +5644,33 @@ request@2.81.0:
     tunnel-agent "^0.6.0"
     uuid "^3.0.0"
 
+request@^2.79.0:
+  version "2.85.0"
+  resolved "https://registry.yarnpkg.com/request/-/request-2.85.0.tgz#5a03615a47c61420b3eb99b7dba204f83603e1fa"
+  dependencies:
+    aws-sign2 "~0.7.0"
+    aws4 "^1.6.0"
+    caseless "~0.12.0"
+    combined-stream "~1.0.5"
+    extend "~3.0.1"
+    forever-agent "~0.6.1"
+    form-data "~2.3.1"
+    har-validator "~5.0.3"
+    hawk "~6.0.2"
+    http-signature "~1.2.0"
+    is-typedarray "~1.0.0"
+    isstream "~0.1.2"
+    json-stringify-safe "~5.0.1"
+    mime-types "~2.1.17"
+    oauth-sign "~0.8.2"
+    performance-now "^2.1.0"
+    qs "~6.5.1"
+    safe-buffer "^5.1.1"
+    stringstream "~0.0.5"
+    tough-cookie "~2.3.3"
+    tunnel-agent "^0.6.0"
+    uuid "^3.1.0"
+
 require-directory@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/require-directory/-/require-directory-2.1.1.tgz#8c64ad5fd30dab1c976e2344ffe7f792a6a6df42"
@@ -5853,7 +5745,7 @@ right-align@^0.1.1:
   dependencies:
     align-text "^0.1.1"
 
-rimraf@2, rimraf@^2.2.8, rimraf@^2.5.1, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.2:
+rimraf@^2.2.8, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.2:
   version "2.6.2"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.6.2.tgz#2ed8150d24a16ea8651e6d6ef0f47c4158ce7a36"
   dependencies:
@@ -5942,10 +5834,6 @@ semver@5.4.1:
   version "5.4.1"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.4.1.tgz#e059c09d8571f0540823733433505d3a2f00b18e"
 
-semver@~5.3.0:
-  version "5.3.0"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-5.3.0.tgz#9b2ce5d3de02d17c6012ad326aa6b4d0cf54f94f"
-
 serialize-error@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/serialize-error/-/serialize-error-2.1.0.tgz#50b679d5635cdf84667bdc8e59af4e5b81d5f60a"
@@ -6022,6 +5910,12 @@ simple-bufferstream@1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/simple-bufferstream/-/simple-bufferstream-1.0.0.tgz#5cab10e851aa71c667b77b61fe1bb1d90a60baa4"
 
+simple-git@^1.92.0:
+  version "1.92.0"
+  resolved "https://registry.yarnpkg.com/simple-git/-/simple-git-1.92.0.tgz#6061468eb7d19f0141078fc742e62457e910f547"
+  dependencies:
+    debug "^3.1.0"
+
 simple-swizzle@^0.2.2:
   version "0.2.2"
   resolved "https://registry.yarnpkg.com/simple-swizzle/-/simple-swizzle-0.2.2.tgz#a4da6b635ffcccca33f70d17cb92592de95e557a"
@@ -6447,27 +6341,6 @@ tapable@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/tapable/-/tapable-1.0.0.tgz#cbb639d9002eed9c6b5975eb20598d7936f1f9f2"
 
-tar-pack@^3.4.0:
-  version "3.4.1"
-  resolved "https://registry.yarnpkg.com/tar-pack/-/tar-pack-3.4.1.tgz#e1dbc03a9b9d3ba07e896ad027317eb679a10a1f"
-  dependencies:
-    debug "^2.2.0"
-    fstream "^1.0.10"
-    fstream-ignore "^1.0.5"
-    once "^1.3.3"
-    readable-stream "^2.1.4"
-    rimraf "^2.5.1"
-    tar "^2.2.1"
-    uid-number "^0.0.6"
-
-tar@^2.0.0, tar@^2.2.1:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/tar/-/tar-2.2.1.tgz#8e4d2a256c0e2185c6b18ad694aec968b83cb1d1"
-  dependencies:
-    block-stream "*"
-    fstream "^1.0.2"
-    inherits "2"
-
 tar@^4:
   version "4.4.2"
   resolved "https://registry.yarnpkg.com/tar/-/tar-4.4.2.tgz#60685211ba46b38847b1ae7ee1a24d744a2cd462"
@@ -6671,10 +6544,6 @@ uglifyjs-webpack-plugin@^1.2.4:
     webpack-sources "^1.1.0"
     worker-farm "^1.5.2"
 
-uid-number@^0.0.6:
-  version "0.0.6"
-  resolved "https://registry.yarnpkg.com/uid-number/-/uid-number-0.0.6.tgz#0ea10e8035e8eb5b8e4449f06da1c730663baa81"
-
 uid2@0.0.3:
   version "0.0.3"
   resolved "https://registry.yarnpkg.com/uid2/-/uid2-0.0.3.tgz#483126e11774df2f71b8b639dcd799c376162b82"
@@ -6936,7 +6805,7 @@ which-module@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/which-module/-/which-module-2.0.0.tgz#d9ef07dce77b9902b8a3a8fa4b31c3e3f7e6e87a"
 
-which@1, which@^1.2.9, which@^1.3.0:
+which@^1.2.9, which@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/which/-/which-1.3.0.tgz#ff04bdfc010ee547d780bec38e1ac1c2777d253a"
   dependencies: