Pin dependencies

package.json

@@ -6,14 +6,14 @@
     "start": "node ./bin/www"
   },
   "dependencies": {
-    "compression": "^1.7.4",
+    "compression": "1.7.4",
     "connect-pg-simple": "5.0.0",
     "cookie-parser": "1.4.4",
     "debug": "4.1.1",
     "express": "4.17.1",
     "express-compile-sass": "latest",
     "express-graphql": "0.8.0",
-    "express-minify": "^1.0.0",
+    "express-minify": "1.0.0",
     "express-session": "latest",
     "fs-extra": "8.0.1",
     "graphql": "14.3.1",
@@ -28,8 +28,8 @@
     "node-sass": "4.12.0",
     "pg": "7.11.0",
     "pug": "2.0.3",
-    "socket.io": "^2.2.0",
-    "uglify-es": "^3.3.9"
+    "socket.io": "2.2.0",
+    "uglify-es": "3.3.9"
   },
   "devDependencies": {
     "eslint": "5.16.0",