diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index cf16bc5..eba47cf 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -36,9 +36,11 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v5
         with:
           files: lcov.info
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}  
   docs:
     name: Documentation
     runs-on: ubuntu-latest
diff --git a/test/runtests.jl b/test/runtests.jl
index e776b16..ffaf406 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -44,6 +44,10 @@ end
     m4 = maxnet(p_a, env[(:ecoreg,)], addsamplestobackground =false)
     m5 = maxnet(p_a, env[(:cld6190_ann, :h_dem)]; features = "ht", n_knots = 3)
 
+    # test that the model throws an error if there are no presences
+    @test_throws "All data points are absences" maxnet(falses(length(p_a)), env)
+    @test_throws "All data points are presences" maxnet(trues(length(p_a)), env)
+
     # test the results
     @test m.entropy ≈ 6.114650341746531
     @test complexity(m) == 21