 diff --git a/setup.py b/setup.py
-index 1571d3c..f868a37 100755
+index 7c8cf5d..2b6c434 100755
 --- a/setup.py
 +++ b/setup.py
-@@ -450,15 +450,9 @@ class tkwant_sdist(sdist):
+@@ -459,14 +459,9 @@ class tkwant_sdist(sdist):
  ################ requirements
  
  requirements = (

-    "sympy",
-    "kwant>=1.3,<2.0",
-    "mpi4py>=2.0",
-    "dill",
-    "tinyarray",
-    "kwantspectrum",
+    "cython",

 )
 
 test_requirements = (

