diff --git a/pyproject.toml b/pyproject.toml
index ab54d5e..4155368 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,8 +5,8 @@ description = "MCP server for reading, rendering, and searching PDF files"
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
-    "mcp[cli]",
-    "pymupdf",
+    "mcp[cli]>=1.26,<2",
+    "pymupdf>=1.27.2,<2",
     "pymupdf4llm",
 ]
 
diff --git a/uv.lock b/uv.lock
index 6d1aace..4e54ba3 100644
--- a/uv.lock
+++ b/uv.lock
@@ -471,8 +471,8 @@ dev = [
 
 [package.metadata]
 requires-dist = [
-    { name = "mcp", extras = ["cli"] },
-    { name = "pymupdf" },
+    { name = "mcp", extras = ["cli"], specifier = ">=1.26,<2" },
+    { name = "pymupdf", specifier = ">=1.27.2,<2" },
     { name = "pymupdf4llm" },
 ]