diff --git a/BTCPayServer.Tests/Dockerfile b/BTCPayServer.Tests/Dockerfile
index fc503a9ee..8b3b4488b 100644
--- a/BTCPayServer.Tests/Dockerfile
+++ b/BTCPayServer.Tests/Dockerfile
@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/core/sdk:2.1.505-alpine3.7 AS builder
+FROM mcr.microsoft.com/dotnet/core/sdk:2.1.607-alpine3.9 AS builder
 ENV DOTNET_SYSTEM_GLOBALIZATION_INVARIANT false
 RUN apk add --no-cache icu-libs
 ENV LC_ALL en_US.UTF-8