diff --git a/Dockerfile b/Dockerfile
index 932a713..14e6a2f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
 ARG ARCH
 
 # STEP 1 build executable binary
-FROM amd64/golang:1.15.7-alpine3.12@sha256:9f88dc7df11a83b9641d71b4be4f8ccbfb2342e5cb733661363ed3d0a98fe3ef AS builder-amd64
-FROM arm32v7/golang:1.15.7-alpine3.12@sha256:d54bff25a171d1b3036bf6b5dea2bbfaf75b7518e9b780a046750d8e26a19253 AS builder-arm
-FROM arm64v8/golang:1.15.7-alpine3.12@sha256:e5389316a6dc295d6c0ca269c39124ad5bc9ebb416c71c810822cf6fbcf8ff01 AS builder-arm64
+FROM amd64/golang:1.15.7-alpine3.13@sha256:18100456495c42bcdccab3411d8cfd56f3fdaa8527dd2b5a83800f96c7074a41 AS builder-amd64
+FROM arm32v7/golang:1.15.7-alpine3.13@sha256:53703f1d8d6b54375840a86d27583d75f1058c03c962ef1d82d13d19605d1f1b AS builder-arm
+FROM arm64v8/golang:1.15.7-alpine3.13@sha256:6e753d463df73168d815fe49861034c529d35730b5ed258866c40b9f868aabe2 AS builder-arm64
 FROM builder-${ARCH} AS builder
 
 ENV MORTY_VERSION="f56efbfca411605bc7a2b5cc8fcad91df537a597"
diff --git a/renovate.json b/renovate.json
index 5f675dd..9cf374a 100644
--- a/renovate.json
+++ b/renovate.json
@@ -26,7 +26,7 @@
       "matchStrings": [
         "\\s+(?<depName>[a-z0-9\\-]+?)=\"(?<currentValue>.*?)\""
       ],
-      "lookupNameTemplate": "alpine_3_12/{{{depName}}}",
+      "lookupNameTemplate": "alpine_3_13/{{{depName}}}",
       "versioningTemplate": "loose",
       "datasourceTemplate": "repology"
     }