diff --git a/src/dotnet-mssql/README.md b/src/dotnet-mssql/README.md
index 6fd6e79..79248b4 100644
--- a/src/dotnet-mssql/README.md
+++ b/src/dotnet-mssql/README.md
@@ -7,7 +7,7 @@ Develop C# and .NET Core based applications. Includes all needed SDKs, extension
 
 | Options Id | Description | Type | Default Value |
 |-----|-----|-----|-----|
-| imageVariant | .NET version: | string | 8.0-bookworm |
+| imageVariant | .NET version: | string | 9.0-bookworm |
 
 This template references an image that was [pre-built](https://containers.dev/implementors/reference/#prebuilding) to automatically include needed devcontainer.json metadata.
 
diff --git a/src/dotnet-postgres/README.md b/src/dotnet-postgres/README.md
index e9c52dc..5691276 100644
--- a/src/dotnet-postgres/README.md
+++ b/src/dotnet-postgres/README.md
@@ -7,7 +7,7 @@ Develop C# and .NET Core based applications. Includes all needed SDKs, extension
 
 | Options Id | Description | Type | Default Value |
 |-----|-----|-----|-----|
-| imageVariant | .NET version: | string | 8.0-bookworm |
+| imageVariant | .NET version: | string | 9.0-bookworm |
 
 This template references an image that was [pre-built](https://containers.dev/implementors/reference/#prebuilding) to automatically include needed devcontainer.json metadata.
 
diff --git a/src/dotnet/README.md b/src/dotnet/README.md
index 567768d..ea1c30e 100644
--- a/src/dotnet/README.md
+++ b/src/dotnet/README.md
@@ -7,7 +7,7 @@ Develop C# and .NET based applications. Includes all needed SDKs, extensions, an
 
 | Options Id | Description | Type | Default Value |
 |-----|-----|-----|-----|
-| imageVariant | .NET version: | string | 8.0-bookworm |
+| imageVariant | .NET version: | string | 9.0-bookworm |
 
 This template references an image that was [pre-built](https://containers.dev/implementors/reference/#prebuilding) to automatically include needed devcontainer.json metadata.