diff --git a/2017_04_12_12th/Pentest_KnowledgeMgt_Neo4j/presentation/package.json b/2017_04_12_12th/Pentest_KnowledgeMgt_Neo4j/presentation/package.json
index 1f866ea..150779f 100644
--- a/2017_04_12_12th/Pentest_KnowledgeMgt_Neo4j/presentation/package.json
+++ b/2017_04_12_12th/Pentest_KnowledgeMgt_Neo4j/presentation/package.json
@@ -39,7 +39,7 @@
     "grunt-sass": "~1.2.0",
     "grunt-retire": "~0.3.10",
     "grunt-zip": "~0.17.1",
-    "node-sass": "~3.13.0"
+    "node-sass": ">=4.13.1"
   },
   "license": "MIT"
 }
diff --git a/2017_07_19_15th/Pharming/package.json b/2017_07_19_15th/Pharming/package.json
index eaec2b2..87cd311 100644
--- a/2017_07_19_15th/Pharming/package.json
+++ b/2017_07_19_15th/Pharming/package.json
@@ -37,7 +37,7 @@
     "grunt-retire": "~0.3.10",
     "grunt-zip": "~0.17.1",
     "mustache": "~2.2.1",
-    "node-sass": "~3.13.0",
+    "node-sass": ">=4.13.1",
     "socket.io": "^1.4.8"
   },
   "license": "MIT"
diff --git a/2017_09_23_CryptoWorkshop/vortrag/package.json b/2017_09_23_CryptoWorkshop/vortrag/package.json
index 1f866ea..150779f 100644
--- a/2017_09_23_CryptoWorkshop/vortrag/package.json
+++ b/2017_09_23_CryptoWorkshop/vortrag/package.json
@@ -39,7 +39,7 @@
     "grunt-sass": "~1.2.0",
     "grunt-retire": "~0.3.10",
     "grunt-zip": "~0.17.1",
-    "node-sass": "~3.13.0"
+    "node-sass": ">=4.13.1"
   },
   "license": "MIT"
 }
diff --git a/2017_10_11_18th/staticanalysis/package.json b/2017_10_11_18th/staticanalysis/package.json
index eaec2b2..87cd311 100644
--- a/2017_10_11_18th/staticanalysis/package.json
+++ b/2017_10_11_18th/staticanalysis/package.json
@@ -37,7 +37,7 @@
     "grunt-retire": "~0.3.10",
     "grunt-zip": "~0.17.1",
     "mustache": "~2.2.1",
-    "node-sass": "~3.13.0",
+    "node-sass": ">=4.13.1",
     "socket.io": "^1.4.8"
   },
   "license": "MIT"
diff --git a/slide_master/package.json b/slide_master/package.json
index a220a0f..62b392b 100644
--- a/slide_master/package.json
+++ b/slide_master/package.json
@@ -39,7 +39,7 @@
     "grunt-sass": "~1.2.0",
     "grunt-retire": "~0.3.10",
     "grunt-zip": "~0.17.1",
-    "node-sass": "~3.13.0"
+    "node-sass": ">=4.13.1"
   },
   "license": "MIT"
 }