diff --git a/.github/workflows/cicd.yml b/.github/workflows/cicd.yml
index e6e4fe2..71ba16b 100644
--- a/.github/workflows/cicd.yml
+++ b/.github/workflows/cicd.yml
@@ -25,5 +25,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: Compile
       run: rebar3 compile
+    - name: Xref Check
+      run: rebar3 xref
     - name: Run Tests
       run: rebar3 as test eunit
diff --git a/rebar.config b/rebar.config
index a22daa9..dc61d0c 100644
--- a/rebar.config
+++ b/rebar.config
@@ -8,6 +8,11 @@
    {color, {git, "https://github.com/julianduque/erlang-color.git", {tag, "v1.0.0"}}}
   ]}.
 
+{xref_checks,[
+    undefined_function_calls,undefined_functions,locals_not_used,
+    deprecated_function_calls,deprecated_functions
+]}.
+
 {pre_hooks, [
     %% DEBUG:
     %%  {"(linux|darwin|solaris|freebsd|netbsd|openbsd)", compile,