diff --git a/lib/spec/openapi/utils.js b/lib/spec/openapi/utils.js
index 40c92169..8787efad 100644
--- a/lib/spec/openapi/utils.js
+++ b/lib/spec/openapi/utils.js
@@ -88,7 +88,7 @@ function normalizeUrl (url, serverUrls, stripBasePath) {
 
 function resolveServerUrls (servers) {
   const resolvedUrls = []
-  const findVariablesRegex = /{(.*?)}/g // As for OpenAPI v3 spec url variables are named in brackets, e.g. {foo}
+  const findVariablesRegex = /\{(.*?)\}/gu // As for OpenAPI v3 spec url variables are named in brackets, e.g. {foo}
 
   servers = Array.isArray(servers) ? servers : []
   for (const server of servers) {
diff --git a/lib/util/generate-params-schema.js b/lib/util/generate-params-schema.js
index a0f04152..6c6008d7 100644
--- a/lib/util/generate-params-schema.js
+++ b/lib/util/generate-params-schema.js
@@ -2,7 +2,7 @@
 
 const { matchParams } = require('./match-params')
 
-const namePattern = /\{([^}]+)\}/
+const namePattern = /\{([^}]+)\}/u
 
 function paramName (param) {
   return param.replace(namePattern, (_, captured) => captured)
diff --git a/lib/util/match-params.js b/lib/util/match-params.js
index e3972f3b..384ccceb 100644
--- a/lib/util/match-params.js
+++ b/lib/util/match-params.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const paramPattern = /\{[^{}]+\}/g
+const paramPattern = /\{[^{}]+\}/gu
 
 function hasParams (url) {
   if (!url) return false