diff --git a/src/enforcers.js b/src/enforcers.js
index 9fae90c..d87c13a 100644
--- a/src/enforcers.js
+++ b/src/enforcers.js
@@ -15,7 +15,7 @@ function toArray (value) {
   return isArray(value) ? value : [value]
 }
 
-export let setup = osom({
+export const setup = osom({
   client: {
     type: String,
     default: 'sqlite3',
diff --git a/src/helpers.js b/src/helpers.js
index 0b6446d..91835e0 100644
--- a/src/helpers.js
+++ b/src/helpers.js
@@ -150,7 +150,7 @@ function findKey (schema) {
   let hasIncrements = false
   for (const name in schema) {
     if (!schema.hasOwnProperty(name)) continue
-    let props = schema[name]
+    const props = schema[name]
     if (props === 'increments' || props.type === 'increments') {
       key = name
       hasIncrements = true
diff --git a/src/index.js b/src/index.js
index 6111756..3195011 100644
--- a/src/index.js
+++ b/src/index.js
@@ -85,7 +85,7 @@ class Trilogy {
       return false
     }
 
-    let query = this.knex.schema.hasTable(name)
+    const query = this.knex.schema.hasTable(name)
     return runQuery(this, query, true)
   }
 
diff --git a/src/sqljs-handler.js b/src/sqljs-handler.js
index 912af72..7f08075 100644
--- a/src/sqljs-handler.js
+++ b/src/sqljs-handler.js
@@ -16,7 +16,7 @@ export function readDatabase (instance) {
 
   try {
     makeDirPath(dirname(filename))
-    let file = readFileSync(filename)
+    const file = readFileSync(filename)
     client = new SQL.Database(file)
   } catch (e) {
     if (e.code === 'ENOENT') {
diff --git a/src/util.js b/src/util.js
index 14b60c3..8aa0338 100644
--- a/src/util.js
+++ b/src/util.js
@@ -31,7 +31,7 @@ export function isOneOf (array, value) {
   return array.some(v => v === value)
 }
 
-export let isType = (value, kind) => {
+export const isType = (value, kind) => {
   if (!kind) return type(value)
   return type(value) === kind.toLowerCase()
 }