diff --git a/apps/users.lua b/apps/users.lua
index 02bfd42..b065a39 100644
--- a/apps/users.lua
+++ b/apps/users.lua
@@ -5,7 +5,7 @@ local constants = require("constants")
 
 local util = require("util")
 
-local bcrypt = require("bcrypt")
+local auth = require("lib.auth")
 local rand = require("openssl.rand")
 
 local models = require("models")
@@ -14,7 +14,7 @@ local Sessions = models.Sessions
 local Avatars = models.Avatars
 
 local function authenticate_user(user, password)
-  return bcrypt.verify(password, user.password_hash)
+  return auth.verify(password, user.password_hash)
 end
 
 local function create_session_key()
@@ -321,7 +321,7 @@ app:post("user_signup", "/signup", function(self)
 
   local new_user = Users:create({
     username = username,
-    password_hash = bcrypt.digest(password, constants.BCRYPT_ROUNDS),
+    password_hash = auth.digest(password),
     permission = constants.PermissionLevel.GUEST,
   })
 
diff --git a/create_default_accounts.lua b/create_default_accounts.lua
index 318bbff..184bf64 100644
--- a/create_default_accounts.lua
+++ b/create_default_accounts.lua
@@ -1,4 +1,4 @@
-local bcrypt = require("bcrypt")
+local auth = require("lib.auth")
 local models = require("models")
 local constants = require("constants")
 
@@ -29,7 +29,7 @@ local function create_admin()
     password = password .. alphabet:sub(randi, randi)
   end
 
-  local hash = bcrypt.digest(password, constants.BCRYPT_ROUNDS)
+  local hash = auth.digest(password)
 
   models.Users:create({
     username = username,
diff --git a/lib/auth.lua b/lib/auth.lua
new file mode 100644
index 0000000..d724082
--- /dev/null
+++ b/lib/auth.lua
@@ -0,0 +1,16 @@
+local auth = {}
+
+local ls = require "luasodium"
+
+function auth.digest(password)
+  return ls.crypto_pwhash_str(
+    password,
+    ls.crypto_pwhash_OPSLIMIT_INTERACTIVE,
+    ls.crypto_pwhash_MEMLIMIT_INTERACTIVE)
+end
+
+function auth.verify(password, hash)
+  return ls.crypto_pwhash_str_verify(hash, password)
+end
+
+return auth
diff --git a/porom-dev-1.rockspec b/porom-dev-1.rockspec
index e82d4e1..a794dc3 100644
--- a/porom-dev-1.rockspec
+++ b/porom-dev-1.rockspec
@@ -16,7 +16,7 @@ dependencies = {
   "lapis == 1.16.0",
   "lsqlite3",
   "magick",
-  "bcrypt",
+  "luasodium",
   "luaossl",
 }
 
diff --git a/start.sh b/start.sh
index e2558ed..6cb5f48 100755
--- a/start.sh
+++ b/start.sh
@@ -7,9 +7,9 @@ start() {
 first_launch() {
   echo "Setting up for the first time"
   touch ".first_launch.$LAPIS_ENVIRONMENT"
-  lua5.1 schema.lua
+  luajit schema.lua
   lapis migrate
-  lua5.1 create_default_accounts.lua
+  luajit create_default_accounts.lua
 }
 
 if [[ $# -ne 1 ]]; then