diff --git a/requirements.txt b/requirements.txt
index 815a2771..2189f7cc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,5 +25,5 @@ pytest_mock
 requests
 rlp>=1.0.1
 transaction>=2.2.1
-z3-solver>=4.8.0.0
+z3-solver-mythril>=4.8.4.1
 pysha3
diff --git a/setup.py b/setup.py
index ad60e07c..82a6fbed 100755
--- a/setup.py
+++ b/setup.py
@@ -75,7 +75,7 @@ setup(
         "coloredlogs>=10.0",
         "py_ecc==1.4.2",
         "ethereum>=2.3.2",
-        "z3-solver>=4.8.0.0",
+        "z3-solver-mythril>=4.8.4.1",
         "requests",
         "py-solc",
         "plyvel",