diff --git a/setup.cfg b/setup.cfg
index e12b96d..4e3eff9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -23,10 +23,11 @@ python_requires = >=3.7
 
 [options.extras_require]
 test =
-    pytest>=5.4,<6
+    pytest>=5.4
     coverage>=5.2,<6
 docs =
     nbsphinx==0.8.8
     sphinxcontrib-napoleon==0.7
     sphinx-rtd-theme==1.0.0
-
+passagemath =
+    passagemath-pari
diff --git a/tests/test_arithmetic_field.py b/tests/test_arithmetic_field.py
index 1d76a73..eaf0d1e 100644
--- a/tests/test_arithmetic_field.py
+++ b/tests/test_arithmetic_field.py
@@ -1,5 +1,5 @@
 from circkit.arithmetic import ArithmeticCircuit
-from sage.all import GF
+from sage.rings.finite_rings.finite_field_constructor import GF
 import random
 K = GF(2**8)
 
diff --git a/tests/test_builtin_circuit.py b/tests/test_builtin_circuit.py
index 1d76a73..eaf0d1e 100644
--- a/tests/test_builtin_circuit.py
+++ b/tests/test_builtin_circuit.py
@@ -1,5 +1,5 @@
 from circkit.arithmetic import ArithmeticCircuit
-from sage.all import GF
+from sage.rings.finite_rings.finite_field_constructor import GF
 import random
 K = GF(2**8)
 
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..17b83e7
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,18 @@
+[tox]
+envlist = passagemath
+
+[testenv:.pkg]
+passenv =
+    CPATH
+    LIBRARY_PATH
+
+[testenv:passagemath]
+usedevelop = True
+extras = passagemath, test
+
+passenv =
+    CPATH
+    LIBRARY_PATH
+
+commands =
+    pytest tests