diff --git a/.github/workflows/runtime.yml b/.github/workflows/runtime.yml
index 653ab219bba..b0d24ee141b 100644
--- a/.github/workflows/runtime.yml
+++ b/.github/workflows/runtime.yml
@@ -185,6 +185,13 @@ jobs:
         echo "::remove-matcher owner=elixir-mixTestFailure::"
         echo "::remove-matcher owner=elixir-dialyzerOutputDefault::"
 
+    - name: Enable ModPresenceDemo and an Elixir dependency
+      run: |
+        sed -i "s|^modules:|modules:\n  'ModPresenceDemo': {}|g" ejabberd.yml.example
+        cat ejabberd.yml.example
+        sed -i 's|^{deps, \(.*\)|{deps, \1\n  {decimal, ".*", {git, "https://github.com/ericmj/decimal", {branch, "main"}}}, |g' rebar.config
+        cat rebar.config
+
     - name: Compile
       run: |
         ./autogen.sh