diff --git a/package-lock.json b/package-lock.json
index d4d0d88..13037d5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
 	"name": "vscode-asciidoc-slides",
-	"version": "1.0.0",
+	"version": "1.3.0",
 	"lockfileVersion": 1,
 	"requires": true,
 	"dependencies": {
@@ -15,6 +15,8 @@
 		},
 		"@asciidoctor/reveal.js": {
 			"version": "4.0.1",
+			"resolved": "https://registry.npmjs.org/@asciidoctor/reveal.js/-/reveal.js-4.0.1.tgz",
+			"integrity": "sha512-LEVNtVDdgVbCqkq0+pmvyaF9ROuvPUVFS84V+UM1SbDnTdqCTio/Oj/k2C7alTANDedIMklxuZGKk38bhJGwoA==",
 			"requires": {
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 				"reveal.js": "3.9.2"
@@ -177,41 +179,6 @@
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-			"resolved": "https://registry.npmjs.org/@sidvind/better-ajv-errors/-/better-ajv-errors-0.6.10.tgz",
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-					"resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
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-					"dev": true,
-					"requires": {
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-					"resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
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-					"dev": true,
-					"requires": {
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-					}
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@@ -222,6 +189,8 @@
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 		"@types/axios": {
 			"version": "0.14.0",
+			"resolved": "https://registry.npmjs.org/@types/axios/-/axios-0.14.0.tgz",
+			"integrity": "sha1-7CMA++fX3d1+udOr+HmZlkyvzkY=",
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@@ -251,7 +220,9 @@
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 		},
 		"@types/chai": {
-			"version": "4.2.11"
+			"version": "4.2.11",
+			"resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.11.tgz",
+			"integrity": "sha512-t7uW6eFafjO+qJ3BIV2gGUyZs27egcNRkUdalkud+Qa3+kg//f129iuOFivHDXQ+vnU3fDXuwgv0cqMCbcE8sw=="
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 			"version": "1.1.1",
@@ -317,6 +288,8 @@
 		},
 		"@types/glob": {
 			"version": "7.1.1",
+			"resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.1.tgz",
+			"integrity": "sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==",
 			"dev": true,
 			"requires": {
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@@ -324,18 +297,16 @@
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 		},
+		"@types/http-errors": {
+			"version": "1.8.2",
+			"resolved": "https://registry.npmjs.org/@types/http-errors/-/http-errors-1.8.2.tgz",
+			"integrity": "sha512-EqX+YQxINb+MeXaIqYDASb6U6FCHbWjkj4a1CKDBks3d/QiB2+PqBLyO72vLDgAO1wUI4O+9gweRcQK11bTL/w=="
+		},
 		"@types/json-schema": {
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 		},
+		"@types/koa": {
+			"version": "2.13.4",
+			"resolved": "https://registry.npmjs.org/@types/koa/-/koa-2.13.4.tgz",
+			"integrity": "sha512-dfHYMfU+z/vKtQB7NUrthdAEiSvnLebvBjwHtfFmpZmB7em2N3WVQdHgnFq+xvyVgxW5jKDmjWfLD3lw4g4uTw==",
+			"requires": {
+				"@types/accepts": "*",
+				"@types/content-disposition": "*",
+				"@types/cookies": "*",
+				"@types/http-assert": "*",
+				"@types/http-errors": "*",
+				"@types/keygrip": "*",
+				"@types/koa-compose": "*",
+				"@types/node": "*"
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@@ -373,6 +359,8 @@
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+			"resolved": "https://registry.npmjs.org/@types/koa-ejs/-/koa-ejs-4.2.2.tgz",
+			"integrity": "sha512-87mMSdvMj9HVKGTvX2IsG40HUsH3ucEzE03r/vMxtSu9AXekxeOJVOyfK5dDoL+fEw7ZtY0AuFwccqShsMVlzQ==",
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@@ -395,6 +383,8 @@
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 		"@types/koa-favicon": {
 			"version": "2.0.19",
+			"resolved": "https://registry.npmjs.org/@types/koa-favicon/-/koa-favicon-2.0.19.tgz",
+			"integrity": "sha512-QmpDuOpMn7soINt0mbOdZIaRQp9vRVR7g/MfLqozAq0gZALxqtcu6KUIWf6vxvkY5U1jzFctfaPa7I3KpAcbqA==",
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@@ -417,6 +407,8 @@
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+			"resolved": "https://registry.npmjs.org/@types/koa-logger/-/koa-logger-3.1.1.tgz",
+			"integrity": "sha512-wp2HaskkPugfwgXgNnc+idnReuJZSTTYQbkcxXjsMhp1kTc342PxDzTL9FXDgBfEvgt9NX1CCGjkwPKX2dlEKQ==",
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@@ -437,48 +429,12 @@
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-						"@types/content-disposition": "*",
-						"@types/cookies": "*",
-						"@types/http-assert": "*",
-						"@types/keygrip": "*",
-						"@types/koa-compose": "*",
-						"@types/node": "*"
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-				}
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-		},
-		"@types/koa-static-server": {
-			"version": "1.3.0",
+		"@types/koa-send": {
+			"version": "4.1.3",
+			"resolved": "https://registry.npmjs.org/@types/koa-send/-/koa-send-4.1.3.tgz",
+			"integrity": "sha512-daaTqPZlgjIJycSTNjKpHYuKhXYP30atFc1pBcy6HHqB9+vcymDgYTguPdx9tO4HMOqNyz6bz/zqpxt5eLR+VA==",
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-					"requires": {
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-						"@types/content-disposition": "*",
-						"@types/cookies": "*",
-						"@types/http-assert": "*",
-						"@types/keygrip": "*",
-						"@types/koa-compose": "*",
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@@ -494,6 +450,8 @@
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 		"@types/mocha": {
 			"version": "7.0.2",
+			"resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-7.0.2.tgz",
+			"integrity": "sha512-ZvO2tAcjmMi8V/5Z3JsyofMe3hasRcaw88cto5etSVMwVQfeivGAlEYmaQgceUSVYFofVjT+ioHsATjdWcFt1w==",
 			"dev": true
 		},
 		"@types/node": {
@@ -531,6 +489,14 @@
 				"@types/mime": "*"
 			}
 		},
+		"@types/slash": {
+			"version": "3.0.0",
+			"resolved": "https://registry.npmjs.org/@types/slash/-/slash-3.0.0.tgz",
+			"integrity": "sha512-bmUaw0IUPUVldtj4YwU7tbzxllQQgsWdnB45bwTI0f1Lq2Yg8lT2yxV4OGZrMTrP/G9v8eVIhX130xPe/RfPfw==",
+			"requires": {
+				"slash": "*"
+			}
+		},
 		"@types/tough-cookie": {
 			"version": "4.0.0",
 			"resolved": "https://registry.npmjs.org/@types/tough-cookie/-/tough-cookie-4.0.0.tgz",
@@ -538,16 +504,30 @@
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 		"@types/vscode": {
 			"version": "1.43.0",
+			"resolved": "https://registry.npmjs.org/@types/vscode/-/vscode-1.43.0.tgz",
+			"integrity": "sha512-kIaR9qzd80rJOxePKpCB/mdy00mz8Apt2QA5Y6rdrKFn13QNFNeP3Hzmsf37Bwh/3cS7QjtAeGSK7wSqAU0sYQ==",
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 		},
 		"@types/web-resource-inliner": {
 			"version": "4.2.0",
+			"resolved": "https://registry.npmjs.org/@types/web-resource-inliner/-/web-resource-inliner-4.2.0.tgz",
+			"integrity": "sha512-XKN3keyjKcdUWQi7YpNLA9de4a1dsj9rZIyUYdZmu9o1Z0PUkeLxig6oZCrXts2weRPEJl/KYP+gtvJBeuqLGA==",
 			"requires": {
 				"@types/request": "*"
 			}
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+		"@types/ws": {
+			"version": "7.4.7",
+			"resolved": "https://registry.npmjs.org/@types/ws/-/ws-7.4.7.tgz",
+			"integrity": "sha512-JQbbmxZTZehdc2iszGKs5oC3NFnjeay7mtAWrdt7qNtAVK0g19muApzAy4bm9byz79xa2ZnO/BOBC2R8RC5Lww==",
+			"requires": {
+				"@types/node": "*"
+			}
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 		"@typescript-eslint/eslint-plugin": {
 			"version": "2.24.0",
+			"resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.24.0.tgz",
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@@ -578,6 +558,8 @@
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 			"version": "2.1.1",
+			"resolved": "https://registry.npmjs.org/asciidoctor/-/asciidoctor-2.1.1.tgz",
+			"integrity": "sha512-YfgnQ/dudXm1klwZTV0OXFoX+wl17amJSFlFLNROSBjyVaT04uq+9gwZ84nCUy5sr5UrBqS+Q7ZFYssFoLqYkQ==",
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@@ -1069,6 +1037,8 @@
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-			"integrity": "sha1-MasayLEpNjRj41s+u2n038+6eUc="
+		"axios": {
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+			"resolved": "https://registry.npmjs.org/axios/-/axios-0.19.2.tgz",
+			"integrity": "sha512-fjgm5MvRHLhx+osE2xoekY70AhARk3a6hkN+3Io1jc00jtquGvxYlKlsFUhmUET0V5te6CcZI7lcv2Ym61mjHA==",
+			"requires": {
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@@ -1292,14 +1250,6 @@
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@@ -7358,6 +6954,8 @@
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diff --git a/package.json b/package.json
index 6146c86..e09cd33 100644
--- a/package.json
+++ b/package.json
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 		"koa-send": "^5.0.0",
 		"open": "^7.0.3",
-		"reveal.js": "^3.9.2",
+		"reveal.js": "^4.3.0",
 		"slash": "^3.0.0",
 		"web-resource-inliner": "^4.3.4"
 	}
diff --git a/yarn.lock b/yarn.lock
index 245d603..881ab32 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3878,11 +3878,16 @@ ret@~0.1.10:
   resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
   integrity sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg==
 
-reveal.js@3.9.2, reveal.js@^3.9.2:
+reveal.js@3.9.2:
   version "3.9.2"
   resolved "https://registry.yarnpkg.com/reveal.js/-/reveal.js-3.9.2.tgz#7f63d3dfec338b6c313dcabdf006e8cf80e0b358"
   integrity sha512-Dvv2oA9FrtOHE2DWj5js8pMRfwq++Wmvsn1EyAdYLC80lBjTphns+tPsB652Bnvep9AVviuVS/b4XoVY9rXHLA==
 
+reveal.js@^4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/reveal.js/-/reveal.js-4.3.0.tgz#6fe91cc84de2e286f039545cb596dbc4d0d52294"
+  integrity sha512-KzZxJjj1gmxVNyplY6g9MiGwtDvZJiYkMvG1Qmaita7vWT/8eoTEK+RuIPLvxDeyxOtTz56u2wrOETVO79qL4A==
+
 rimraf@2.6.3:
   version "2.6.3"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.6.3.tgz#b2d104fe0d8fb27cf9e0a1cda8262dd3833c6cab"