diff --git a/.gitignore b/.gitignore
index 0dba073..8cccf88 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /Manifest.toml
 .DS_Store
 /test/Manifest.toml
+.vscode
diff --git a/Project.toml b/Project.toml
index 7c5d44f..99185e1 100644
--- a/Project.toml
+++ b/Project.toml
@@ -7,7 +7,7 @@ version = "0.1.0"
 Rimu = "c53c40cc-bd84-11e9-2cf4-a9fde2b9386e"
 
 [compat]
-Rimu = "0.14"
+Rimu = "0.14, 0.15"
 julia = "1.9"
 
 [extras]
diff --git a/test/runtests.jl b/test/runtests.jl
index ca832e3..74b1ffa 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -125,12 +125,14 @@ using RimuLegacyHamiltonians: bose_hubbard_2c_interaction
     @testset "2C Hamiltonian interface and structure" begin
         fs2c = BoseFS2C((1, 0, 1), (0, 1, 0))
         hr = BoseHubbardReal1D2C(fs2c)
-        test_hamiltonian_interface(hr)
-        test_hamiltonian_structure(hr)
-
         hm = BoseHubbardMom1D2C(fs2c)
-        test_hamiltonian_interface(hm)
-        test_hamiltonian_structure(hm)
+        ghr = GutzwillerSampling(hr; g=0.8) # test compatibility with ModifiedHamiltonian
+        ghm = GutzwillerSampling(hm; g=0.8)
+
+        for h in (hr, hm, ghr, ghm)
+            test_hamiltonian_interface(h)
+            test_hamiltonian_structure(h)
+        end
     end
 
     @testset "2C model properties" begin