diff --git a/build/docker/README.md b/build/docker/README.md
index 9e972b8..6b535df 100644
--- a/build/docker/README.md
+++ b/build/docker/README.md
@@ -188,7 +188,7 @@
 | java      | 17            | 17            |       |
 | js        | Node.js 16.20.2, npm 8.19.4 | Node.js 16.20.2, npm 8.19.4 |     |
 | lua       | 5.2.4         | 5.2.4         | Lua 5.3: see THRIFT-4386 |
-| netstd    | 8.0.200       | 8.0.200       |       |
+| netstd    | 9.0           | 9.0           |       |
 | nodejs    | 16.20.2       | 16.20.2       |       |
 | ocaml     | 4.08.1        | 4.13.1        |       |
 | perl      | 5.30.0        | 5.34.0        |       |
diff --git a/build/docker/ubuntu-focal/Dockerfile b/build/docker/ubuntu-focal/Dockerfile
index 84bbee1..02f84c6 100644
--- a/build/docker/ubuntu-focal/Dockerfile
+++ b/build/docker/ubuntu-focal/Dockerfile
@@ -139,10 +139,10 @@
 
 RUN apt-get install -y --no-install-recommends \
       `# dotnet core dependencies` \
-      dotnet-sdk-8.0 \
-      dotnet-runtime-8.0 \
-      aspnetcore-runtime-8.0 \
-      dotnet-apphost-pack-8.0
+      dotnet-sdk-9.0 \
+      dotnet-runtime-9.0 \
+      aspnetcore-runtime-9.0 \
+      dotnet-apphost-pack-9.0
 
 # Erlang dependencies
 ARG ERLANG_OTP_VERSION=23.3.4.11
diff --git a/build/docker/ubuntu-jammy/Dockerfile b/build/docker/ubuntu-jammy/Dockerfile
index 0505bf5..c6176a8 100644
--- a/build/docker/ubuntu-jammy/Dockerfile
+++ b/build/docker/ubuntu-jammy/Dockerfile
@@ -138,10 +138,10 @@
 
 RUN apt-get install -y --no-install-recommends \
   `# dotnet core dependencies` \
-  dotnet-sdk-8.0 \
-  dotnet-runtime-8.0 \
-  aspnetcore-runtime-8.0 \
-  dotnet-apphost-pack-8.0
+  dotnet-sdk-9.0 \
+  dotnet-runtime-9.0 \
+  aspnetcore-runtime-9.0 \
+  dotnet-apphost-pack-9.0
 
 # Erlang dependencies
 ARG ERLANG_OTP_VERSION=25.3.2.9
diff --git a/build/veralign.sh b/build/veralign.sh
index 8664a46..b929f1f 100755
--- a/build/veralign.sh
+++ b/build/veralign.sh
@@ -72,8 +72,8 @@
 FILES[lib/lua/Thrift.lua]=simpleReplace
 FILES[lib/netstd/Thrift/Properties/AssemblyInfo.cs]=simpleReplace
 FILES[lib/netstd/Benchmarks/Thrift.Benchmarks/Thrift.Benchmarks.csproj]=simpleReplace
-FILES[lib/netstd/Tests/Thrift.Compile.Tests/Thrift.Compile.net6/Thrift.Compile.net6.csproj]=simpleReplace
 FILES[lib/netstd/Tests/Thrift.Compile.Tests/Thrift.Compile.net8/Thrift.Compile.net8.csproj]=simpleReplace
+FILES[lib/netstd/Tests/Thrift.Compile.Tests/Thrift.Compile.net9/Thrift.Compile.net9.csproj]=simpleReplace
 FILES[lib/netstd/Tests/Thrift.Compile.Tests/Thrift.Compile.netstd2/Thrift.Compile.netstd2.csproj]=simpleReplace
 FILES[lib/netstd/Tests/Thrift.IntegrationTests/Thrift.IntegrationTests.csproj]=simpleReplace
 FILES[lib/netstd/Tests/Thrift.Tests/Thrift.Tests.csproj]=simpleReplace