diff --git a/Dockerfile b/Dockerfile
index f7125ce..afbbb61 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Base image containing dependencies used in builder and final image
-FROM ghcr.io/swissgrc/azure-pipelines-azurecli:2.50.0-net6 AS base
+FROM ghcr.io/swissgrc/azure-pipelines-azurecli:2.51.0-net6 AS base
 
 
 # Builder image
@@ -13,7 +13,7 @@ SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 # renovate: datasource=repology depName=debian_11/curl versioning=loose
 ENV CURL_VERSION=7.74.0-1.3+deb11u7
 # renovate: datasource=github-releases depName=hashicorp/terraform extractVersion=^v(?<version>.*)$
-ENV TERRAFORM_VERSION=1.5.5
+ENV TERRAFORM_VERSION=1.5.6
 # renovate: datasource=repology depName=debian_11/unzip versioning=loose
 ENV UNZIP_VERSION=6.0-26+deb11u1
 
diff --git a/README.md b/README.md
index 7c55b83..2049619 100644
--- a/README.md
+++ b/README.md
@@ -65,8 +65,8 @@ Note that two secret variables (`Azure.UserName` and `Azure.Password`) are passe
 
 | Tag      | Description                                                                     | Base Image                                    | Terraform | Size                                                                                                                               |
 |----------|---------------------------------------------------------------------------------|-----------------------------------------------|-----------|------------------------------------------------------------------------------------------------------------------------------------|
-| latest   | Latest stable release (from `main` branch)                                      | swissgrc/azure-pipelines-azurecli:2.50.0-net6 | 1.5.4     | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-terraform/latest?style=flat-square)   |
-| unstable | Latest unstable release (from `develop` branch)                                 | swissgrc/azure-pipelines-azurecli:2.50.0-net6 | 1.5.5     | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-terraform/unstable?style=flat-square) |
+| latest   | Latest stable release (from `main` branch)                                      | swissgrc/azure-pipelines-azurecli:2.51.0-net6 | 1.5.6     | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-terraform/latest?style=flat-square)   |
+| unstable | Latest unstable release (from `develop` branch)                                 | swissgrc/azure-pipelines-azurecli:2.51.0-net6 | 1.5.6     | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-terraform/unstable?style=flat-square) |
 | 0.14.6   | [Terraform 0.14.6](https://github.com/hashicorp/terraform/releases/tag/v0.14.6) | azure-cli:2.19.1                              | 0.14.6    | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-terraform/0.14.6?style=flat-square)   |
 | 0.15.0   | [Terraform 0.15.0](https://github.com/hashicorp/terraform/releases/tag/v0.15.0) | azure-cli:2.22.0                              | 0.15.0    | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-terraform/0.15.0?style=flat-square)   |
 | 0.15.1   | [Terraform 0.15.1](https://github.com/hashicorp/terraform/releases/tag/v0.15.1) | azure-cli:2.22.1                              | 0.15.1    | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-terraform/0.15.1?style=flat-square)   |
@@ -101,5 +101,6 @@ Note that two secret variables (`Azure.UserName` and `Azure.Password`) are passe
 | 1.5.3    | [Terraform 1.5.3](https://github.com/hashicorp/terraform/releases/tag/v1.5.3)   | swissgrc/azure-pipelines-azurecli:2.50.0-net6 | 1.5.3     | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-terraform/1.5.3?style=flat-square)    |
 | 1.5.4    | [Terraform 1.5.4](https://github.com/hashicorp/terraform/releases/tag/v1.5.4)   | swissgrc/azure-pipelines-azurecli:2.50.0-net6 | 1.5.4     | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-terraform/1.5.4?style=flat-square)    |
 | 1.5.5    | [Terraform 1.5.5](https://github.com/hashicorp/terraform/releases/tag/v1.5.5)   | swissgrc/azure-pipelines-azurecli:2.50.0-net6 | 1.5.5     | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-terraform/1.5.5?style=flat-square)    |
+| 1.5.6    | [Terraform 1.5.6](https://github.com/hashicorp/terraform/releases/tag/v1.5.6)   | swissgrc/azure-pipelines-azurecli:2.51.0-net6 | 1.5.6     | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-terraform/1.5.6?style=flat-square)    |
 
 [Azure Pipelines container jobs]: https://docs.microsoft.com/en-us/azure/devops/pipelines/process/container-phases