diff --git a/pyproject.toml b/pyproject.toml
index 0d06195e..f538ca26 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,8 @@ google-api-python-client = "==2.95.0"
 eth-utils = "==2.2.0"
 eth-abi = "==4.0.0"
 pycryptodome = "==3.18.0"
-anthropic = "^0.3.11"
+anthropic = "==0.3.11"
+pytest = "==7.2.1"
 
 [tool.poetry.group.dev.dependencies.tomte]
 version = "==0.2.12"
diff --git a/tox.ini b/tox.ini
index 23dd9d2b..79efa8ff 100644
--- a/tox.ini
+++ b/tox.ini
@@ -54,6 +54,7 @@ deps =
     eth-abi==4.0.0
     pycryptodome==3.18.0
     anthropic==0.3.11
+    pytest==7.2.1
 
 [testenv]
 basepython = python3