diff --git a/Dockerfile b/Dockerfile
index e301e44c..7da6426c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
-ARG ALPINE_VERSION=3.14
-ARG GO_ALPINE_VERSION=3.14
+ARG ALPINE_VERSION=3.15
+ARG GO_ALPINE_VERSION=3.15
 ARG GO_VERSION=1.17
 ARG XCPUTRANSLATE_VERSION=v0.6.0
 ARG GOLANGCI_LINT_VERSION=v1.43.0
diff --git a/README.md b/README.md
index 494c6154..83d5c34c 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ using Go, OpenVPN or Wireguard, iptables, DNS over TLS, ShadowSocks and an HTTP
 
 ## Features
 
-- Based on Alpine 3.14 for a small Docker image of 33MB
+- Based on Alpine 3.15 for a small Docker image of 29MB
 - Supports: **Cyberghost**, **ExpressVPN**, **FastestVPN**, **HideMyAss**, **IPVanish**, **IVPN**, **Mullvad**, **NordVPN**, **Perfect Privacy**, **Privado**, **Private Internet Access**, **PrivateVPN**, **ProtonVPN**, **PureVPN**,  **Surfshark**, **TorGuard**, **VPNUnlimited**, **Vyprvpn**, **WeVPN**, **Windscribe** servers
 - Supports OpenVPN for all providers listed
 - Supports Wireguard both kernelspace and userspace