diff --git a/Dockerfile b/Dockerfile
index b726691fa..3410c2c01 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -36,11 +36,11 @@ ARG TARGETPLATFORM
 
 # install terraform binaries
 # renovate: datasource=github-releases depName=hashicorp/terraform versioning=hashicorp
-ENV DEFAULT_TERRAFORM_VERSION=1.3.9
+ENV DEFAULT_TERRAFORM_VERSION=1.4.0
 
 # In the official Atlantis image we only have the latest of each Terraform version.
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
-RUN AVAILABLE_TERRAFORM_VERSIONS="1.0.11 1.1.9 1.2.9 ${DEFAULT_TERRAFORM_VERSION}" && \
+RUN AVAILABLE_TERRAFORM_VERSIONS="1.0.11 1.1.9 1.2.9 1.3.9 ${DEFAULT_TERRAFORM_VERSION}" && \
     case "${TARGETPLATFORM}" in \
         "linux/amd64") TERRAFORM_ARCH=amd64 ;; \
         "linux/arm64") TERRAFORM_ARCH=arm64 ;; \