diff --git a/tools/docker/images/ubuntu-22.04.Dockerfile b/tools/docker/images/ubuntu-22.04.Dockerfile
index a9c39b3da5..3775dbb1be 100644
--- a/tools/docker/images/ubuntu-22.04.Dockerfile
+++ b/tools/docker/images/ubuntu-22.04.Dockerfile
@@ -22,13 +22,8 @@ RUN apt-get update -qq \
 
 # Install .Net
 # see: https://docs.microsoft.com/en-us/dotnet/core/install/linux-ubuntu
-# note: Ubuntu-22.04+ won't support dotnet-sdk-3.1
 # see: https://github.com/dotnet/core/pull/7423/files
 RUN apt-get update -qq \
-&& apt-get install -yq wget apt-transport-https \
-&& wget -q https://packages.microsoft.com/config/ubuntu/22.04/packages-microsoft-prod.deb \
-&& dpkg -i packages-microsoft-prod.deb \
-&& apt-get update -qq \
 && apt-get install -yq dotnet-sdk-6.0 \
 && apt-get clean \
 && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
diff --git a/tools/docker/test/ubuntu-22.04/dotnet.Dockerfile b/tools/docker/test/ubuntu-22.04/dotnet.Dockerfile
index 90e9f262bc..dabae8071e 100644
--- a/tools/docker/test/ubuntu-22.04/dotnet.Dockerfile
+++ b/tools/docker/test/ubuntu-22.04/dotnet.Dockerfile
@@ -10,11 +10,7 @@ RUN apt-get update -qq \
 # Install .Net
 # see https://docs.microsoft.com/en-us/dotnet/core/install/linux-ubuntu#2110-
 RUN apt-get update -qq \
-&& apt-get install -yq wget apt-transport-https \
-&& wget -q https://packages.microsoft.com/config/ubuntu/22.04/packages-microsoft-prod.deb \
-&& dpkg -i packages-microsoft-prod.deb \
-&& apt-get update -qq \
-&& DEBIAN_FRONTEND=noninteractive apt-get install -yq dotnet-sdk-3.1 dotnet-sdk-6.0 \
+&& apt-get install -yq dotnet-sdk-6.0 \
 && apt-get clean \
 && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 # Trigger first run experience by running arbitrary cmd