diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 9ecb9cf..da421e4 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -33,7 +33,7 @@ jobs:
       - name: Install LLVM
         uses: ./.github/actions/install-llvm
         with:
-          os: "ubuntu-latest"
+          os: "ubuntu-20.04"
           version: "15"
 
       - name: Build
diff --git a/CITATION.cff b/CITATION.cff
new file mode 100644
index 0000000..c43a74d
--- /dev/null
+++ b/CITATION.cff
@@ -0,0 +1,24 @@
+cff-version: 1.2.0
+title: Rasqal
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - given-names: John
+    family-names: Dumbell
+    email: john.dumbell42@gmail.com
+    affiliation: Oxford Quantum Circuits (OQC)
+repository-code: "https://github.com/oqc-community/rasqal"
+url: "https://github.com/oqc-community/rasqal"
+abstract: >-
+  Rasqal is a quantum-classical hybrid runtime that leans on
+  dynamic execution of hybrid IRs to optimize and synthesize
+  the circuits it sends to the QPU while executing the
+  classical parts itself. This approach means all
+  non-quantum variables are known at runtime, including
+  results from embedded quantum executions. Such information
+  is then used to enhance classical execution paths and
+  optimize circuit synthesis.
+license: BSD-3-Clause
+license-url: "https://github.com/oqc-community/rasqal/blob/develop/LICENSE"