diff --git a/Pipfile b/Pipfile
index 4f855fc0..ef34f2b4 100644
--- a/Pipfile
+++ b/Pipfile
@@ -9,14 +9,15 @@ plyvel = "*"
 py-solc = "*"
 coverage = "*"
 BTrees = "*"
-ethereum = "*"
-zodb = ">=*"
+ethereum = ">=2.3.0"
+zodb = ">=5.3.0"
 eth-abi = "*"
-"z3-solver" = "*"
+"z3-solver" = ">=4.5"
 eth-account = "*"
 eth-tester = "*"
-laser-ethereum = "*"
+laser-ethereum = ">=0.5.20"
 "jinja2" = "*"
+attrs = ">=17.0.0"
 
 [dev-packages]
 pylint = "*"
diff --git a/requirements.txt b/requirements.txt
index d63c7c86..57bb4861 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,3 +16,4 @@ eth-rlp>=0.1.0
 eth-tester>=0.1.0b21
 coverage
 jinja2
+attrs
diff --git a/setup.py b/setup.py
index 739ae1ec..66d27ea7 100755
--- a/setup.py
+++ b/setup.py
@@ -304,7 +304,8 @@ setup(
         'eth-rlp>=0.1.0',
         'eth-tester>=0.1.0b21',
         'coverage',
-        'jinja2'
+        'jinja2',
+        'attrs'
     ],
 
     python_requires='>=3.5',