diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 56035a9c..d3f2cd5f 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -36,6 +36,11 @@ jobs:
       - uses: julia-actions/cache@v3
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
+        with:
+          # `auto` resolves to `true` on Dependabot/CompatHelper PRs, which is unsatisfiable on
+          # older Julia versions once a dependency's newest range drops support for them,
+          # so only apply it on the newest Julia (matching QuantumKitHubActions/TestGroups.yml).
+          force_latest_compatible_version: ${{ matrix.version == '1' && 'auto' || 'false' }}
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v7
         with:
diff --git a/Project.toml b/Project.toml
index b20e83f0..75cd2375 100644
--- a/Project.toml
+++ b/Project.toml
@@ -12,7 +12,7 @@ WignerSymbols = "9f57e263-0b3d-5e2e-b1be-24f2bb48858b"
 [compat]
 Aqua = "0.8"
 HalfIntegers = "1"
-JET = "0.9, 0.10, 0.11"
+JET = "0.9, 0.10, 0.11, 0.12"
 julia = "1.10"
 LinearAlgebra = "1"
 Random = "1"
diff --git a/test/runtests.jl b/test/runtests.jl
index 0f50aded..f4f0022a 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -376,5 +376,8 @@ end
 
 @testset "JET" begin
     using JET: JET
-    JET.test_package(TensorKitSectors; target_defined_modules = true)
+    # JET v0.12 loads empty stubs on unsupported (future) Julia versions
+    if !isdefined(JET, :JET_AVAILABLE) || JET.JET_AVAILABLE
+        JET.test_package(TensorKitSectors; target_modules = (TensorKitSectors,))
+    end
 end