diff --git a/Dockerfile b/Dockerfile
index c242df97..63d62873 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:5.0.303 AS build-env
+FROM mcr.microsoft.com/dotnet/sdk:5.0.400 AS build-env
 WORKDIR /app
 
 # We need Git for Cliptok builds now.
diff --git a/Dockerfile.multiarch b/Dockerfile.multiarch
index 0640bcc4..1b1c30d6 100644
--- a/Dockerfile.multiarch
+++ b/Dockerfile.multiarch
@@ -1,5 +1,5 @@
 FROM --platform=${BUILDPLATFORM} \
-    mcr.microsoft.com/dotnet/sdk:5.0.303 AS build-env
+    mcr.microsoft.com/dotnet/sdk:5.0.400 AS build-env
 WORKDIR /app
 
 # We need Git for Cliptok builds now.