diff --git a/tests/test_solver.py b/tests/test_solver.py
index e147e5c5e4218fafb8ce6aae2597e9167eb62003..ab8ec4b0fc8100026b5becb3783e135a5afb6f49 100644
--- a/tests/test_solver.py
+++ b/tests/test_solver.py
@@ -101,7 +101,7 @@ def test_example_sss_1d_J_usadel1():
 
     T_c0 = np.exp(np.euler_gamma) / np.pi
     T = 0.2
-    Delta, I0, _, success = sol.self_consistency(T=T, T_c0=T_c0, workers=-1)
+    Delta, I0, _, success = sol.self_consistency(T=T, T_c0=T_c0, workers=1)
 
     tau3 = np.diag([1, 1, -1, -1])
     I0 = tr(I0[:-1, 0, 0] @ tau3)
@@ -221,7 +221,7 @@ def test_selfcons_kupriyanov(request, T):
         T_c0=Tc0,
         phase_mask=phase_mask,
         filename=cache_fn,
-        workers=-1,
+        workers=1,
         ds=0.4,
     )