diff --git a/pyproject.toml b/pyproject.toml
index 188f90b..52d6eae 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ license = {text = "AGPL-3.0-only"}
 requires-python = ">=3.11"
 keywords = ["nextcloud", "mcp", "model-context-protocol", "llm", "ai", "claude", "webdav", "caldav", "carddav"]
 dependencies = [
-    "mcp[cli] (>=1.20,<1.21)",
+    "mcp[cli] (>=1.21,<1.22)",
     "httpx (>=0.28.1,<0.29.0)",
     "pillow (>=12.0.0,<12.1.0)",
     "icalendar (>=6.0.0,<7.0.0)",
diff --git a/uv.lock b/uv.lock
index 871e4ea..9f30a9e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -937,7 +937,7 @@ wheels = [
 
 [[package]]
 name = "mcp"
-version = "1.20.0"
+version = "1.21.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "anyio" },
@@ -953,9 +953,9 @@ dependencies = [
     { name = "starlette" },
     { name = "uvicorn", marker = "sys_platform != 'emscripten'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/f8/22/fae38092e6c2995c03232635028510d77e7decff31b4ae79dfa0ba99c635/mcp-1.20.0.tar.gz", hash = "sha256:9ccc09eaadbfbcbbdab1c9723cfe2e0d1d9e324d7d3ce7e332ef90b09ed35177", size = 451377, upload-time = "2025-10-30T22:14:53.421Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/33/54/dd2330ef4611c27ae59124820863c34e1d3edb1133c58e6375e2d938c9c5/mcp-1.21.0.tar.gz", hash = "sha256:bab0a38e8f8c48080d787233343f8d301b0e1e95846ae7dead251b2421d99855", size = 452697, upload-time = "2025-11-06T23:19:58.432Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/df/00/76fc92f4892d47fecb37131d0e95ea69259f077d84c68f6793a0d96cfe80/mcp-1.20.0-py3-none-any.whl", hash = "sha256:d0dc06f93653f7432ff89f694721c87f79876b6f93741bf628ad1e48f7ac5e5d", size = 173136, upload-time = "2025-10-30T22:14:51.078Z" },
+    { url = "https://files.pythonhosted.org/packages/39/47/850b6edc96c03bd44b00de9a0ca3c1cc71e0ba1cd5822955bc9e4eb3fad3/mcp-1.21.0-py3-none-any.whl", hash = "sha256:598619e53eb0b7a6513db38c426b28a4bdf57496fed04332100d2c56acade98b", size = 173672, upload-time = "2025-11-06T23:19:56.508Z" },
 ]
 
 [package.optional-dependencies]
@@ -1014,7 +1014,7 @@ requires-dist = [
     { name = "click", specifier = ">=8.1.8" },
     { name = "httpx", specifier = ">=0.28.1,<0.29.0" },
     { name = "icalendar", specifier = ">=6.0.0,<7.0.0" },
-    { name = "mcp", extras = ["cli"], specifier = ">=1.20,<1.21" },
+    { name = "mcp", extras = ["cli"], specifier = ">=1.21,<1.22" },
     { name = "pillow", specifier = ">=12.0.0,<12.1.0" },
     { name = "pydantic", specifier = ">=2.11.4" },
     { name = "pyjwt", extras = ["crypto"], specifier = ">=2.8.0" },