diff --git a/servers/tb_business_ops_servers_202606/pyproject.toml b/servers/tb_business_ops_servers_202606/pyproject.toml
index 156d907..b95c44a 100644
--- a/servers/tb_business_ops_servers_202606/pyproject.toml
+++ b/servers/tb_business_ops_servers_202606/pyproject.toml
@@ -8,7 +8,7 @@ version = "0.1.0"
 description = "ThinkingBox business operations MCP servers"
 requires-python = ">=3.10"
 dependencies = [
-    "fastmcp",
+    "fastmcp>=3.4.3,<4",
     "pydantic",
     "odata-query>=0.9.0",
     "typesense",
diff --git a/servers/thinkingbox_tools/pyproject.toml b/servers/thinkingbox_tools/pyproject.toml
index 343f876..849d697 100644
--- a/servers/thinkingbox_tools/pyproject.toml
+++ b/servers/thinkingbox_tools/pyproject.toml
@@ -8,7 +8,7 @@ version = "0.0.1"
 description = "Thinkingbox MCP servers"
 requires-python = ">=3.10"
 dependencies = [
-    "fastmcp",
+    "fastmcp>=3.4.3,<4",
     "httpx",
     "pydantic",
     "python-dateutil",