diff --git a/.drone.yml b/.drone.yml
index f594e4d..0a17e35 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -7,8 +7,10 @@ pipeline:
       - ./compile.sh latex
 
   build-libreoffice:
-    image: jess/libreoffice
+    image: olbat/libreoffice
     commands:
+      - apt-get update
+      - apt-get install -y --no-install-recommends wget make
       - wget -P /usr/share/fonts -c -q
             https://cdn.jsdelivr.net/npm/mozilla-fira-pack/Fira/ttf/FiraMono-Bold.ttf
             https://cdn.jsdelivr.net/npm/mozilla-fira-pack/Fira/ttf/FiraMono-Medium.ttf
@@ -48,7 +50,8 @@ pipeline:
       - ./compile.sh libreoffice
 
   build-revealjs:
-    image: node:alpine
+    image: node
     commands:
-      - apk add --no-cache make
+      - apt-get update
+      - apt-get install make
       - ./compile.sh revealjs
diff --git a/Makefile b/Makefile
index b1f8f62..a4158dc 100644
--- a/Makefile
+++ b/Makefile
@@ -90,7 +90,7 @@ revealjs/node_modules:
 	(cd $(@D) && npm install)
 
 revealjs/%/index.pdf: revealjs/%/index.html
-	phantomjs revealjs/node_modules/reveal.js/plugin/print-pdf/print-pdf.js file://$(PWD)/$<?print-pdf $@
+	revealjs/node_modules/phantomjs-prebuilt/bin/phantomjs revealjs/node_modules/reveal.js/plugin/print-pdf/print-pdf.js file://$(PWD)/$<?print-pdf $@
 
 latex/%/index.pdf: latex/%/index.tex
 	(cd $(@D) && rubber --module xelatex index.tex)
diff --git a/compile.sh b/compile.sh
index a7e52f6..5ad3227 100755
--- a/compile.sh
+++ b/compile.sh
@@ -1,4 +1,6 @@
 #!/bin/sh
+set -e
+
 case "$1" in
 	"latex")
 		make fonts
diff --git a/revealjs/package-lock.json b/revealjs/package-lock.json
index a951ff2..e765b71 100644
--- a/revealjs/package-lock.json
+++ b/revealjs/package-lock.json
@@ -4,11 +4,390 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "ajv": {
+      "version": "5.5.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
+      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "requires": {
+        "co": "4.6.0",
+        "fast-deep-equal": "1.1.0",
+        "fast-json-stable-stringify": "2.0.0",
+        "json-schema-traverse": "0.3.1"
+      }
+    },
+    "asn1": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
+      "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y="
+    },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
+    },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
+    },
+    "aws-sign2": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg="
+    },
+    "aws4": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.7.0.tgz",
+      "integrity": "sha512-32NDda82rhwD9/JBCCkB+MRYDp0oSvlo2IL6rQWA10PQi7tDUM3eqMSltXmY+Oyl/7N3P3qNtAlv7X0d9bI28w=="
+    },
+    "bcrypt-pbkdf": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz",
+      "integrity": "sha1-Y7xdy2EzG5K8Bf1SiVPDNGKgb40=",
+      "optional": true,
+      "requires": {
+        "tweetnacl": "0.14.5"
+      }
+    },
+    "boom": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/boom/-/boom-4.3.1.tgz",
+      "integrity": "sha1-T4owBctKfjiJ90kDD9JbluAdLjE=",
+      "requires": {
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+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw="
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+      "requires": {
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+        "readable-stream": "2.3.6",
+        "typedarray": "0.0.6"
+      }
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+      "requires": {
+        "assert-plus": "1.0.0",
+        "extsprintf": "1.3.0",
+        "json-schema": "0.2.3",
+        "verror": "1.10.0"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/kew/-/kew-0.7.0.tgz",
+      "integrity": "sha1-edk9LTM2PW/dKXCzNdkUGtWR15s="
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+    "klaw": {
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+      "resolved": "https://registry.npmjs.org/klaw/-/klaw-1.3.1.tgz",
+      "integrity": "sha1-QIhDO0azsbolnXh4XY6W9zugJDk=",
+      "requires": {
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+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.33.0.tgz",
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+    },
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+      "version": "2.1.18",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.18.tgz",
+      "integrity": "sha512-lc/aahn+t4/SWV/qcmumYjymLsWfN3ELhpmVuUFjgsORruuZPVSwAQryq+HHGvO/SI2KVX26bx+En+zhM8g8hQ==",
+      "requires": {
+        "mime-db": "1.33.0"
+      }
+    },
+    "minimist": {
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+      "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
+    },
+    "mkdirp": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.0.tgz",
+      "integrity": "sha1-HXMHam35hs2TROFecfzAWkyavxI=",
+      "requires": {
+        "minimist": "0.0.8"
+      }
+    },
+    "ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
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     "npm": {
       "version": "5.8.0",
       "resolved": "https://registry.npmjs.org/npm/-/npm-5.8.0.tgz",
@@ -3864,10 +4243,234 @@
         }
       }
     },
+    "oauth-sign": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.8.2.tgz",
+      "integrity": "sha1-Rqarfwrq2N6unsBWV4C31O/rnUM="
+    },
+    "pend": {
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+      "resolved": "https://registry.npmjs.org/pend/-/pend-1.2.0.tgz",
+      "integrity": "sha1-elfrVQpng/kRUzH89GY9XI4AelA="
+    },
+    "performance-now": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
+      "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns="
+    },
+    "phantomjs-prebuilt": {
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+      "resolved": "https://registry.npmjs.org/phantomjs-prebuilt/-/phantomjs-prebuilt-2.1.16.tgz",
+      "integrity": "sha1-79ISpKOWbTZHaE6ouniFSb4q7+8=",
+      "requires": {
+        "es6-promise": "4.2.4",
+        "extract-zip": "1.6.6",
+        "fs-extra": "1.0.0",
+        "hasha": "2.2.0",
+        "kew": "0.7.0",
+        "progress": "1.1.8",
+        "request": "2.85.0",
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 }
diff --git a/revealjs/package.json b/revealjs/package.json
index 4ae7172..26a4117 100644
--- a/revealjs/package.json
+++ b/revealjs/package.json
@@ -9,13 +9,9 @@
   "dependencies": {
     "highlight.js": "^9.12.0",
     "npm": "^5.8.0",
+    "phantomjs-prebuilt": "^2.1.16",
     "reveal.js": "^3.6.0"
   },
   "author": "Simon Bruder",
-  "license": "MIT",
-  "scripts": {
-    "pdf.ffmpeg": "phantomjs node_modules/reveal.js/plugin/print-pdf/print-pdf.js \"http://localhost:8081/ffmpeg/?print-pdf\" ffmpeg/index.pdf",
-    "pdf.ffmpeg_englisch": "phantomjs node_modules/reveal.js/plugin/print-pdf/print-pdf.js \"http://localhost:8081/ffmpeg_englisch/?print-pdf\" ffmpeg_englisch/index.pdf",
-    "pdf.snowden": "phantomjs node_modules/reveal.js/plugin/print-pdf/print-pdf.js \"http://localhost:8081/snowden/?print-pdf\" snowden/index.pdf"
-  }
+  "license": "MIT"
 }