diff --git a/tf-dev/Dockerfile b/tf-dev/Dockerfile
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+++ b/tf-dev/Dockerfile
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+FROM git.luke-else.co.uk/luke-else/lab:latest
+
+# Download the installer script:
+RUN curl --proto '=https' --tlsv1.2 -fsSL https://get.opentofu.org/install-opentofu.sh -o install-opentofu.sh
+RUN chmod +x install-opentofu.sh
+
+# Run the installer
+RUN ./install-opentofu.sh --install-method apk
+
+# Remove the installer:
+RUN rm -f install-opentofu.sh
+
+CMD [ "tmux" ]
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