diff --git a/mcp-servers/python/data_analysis_server/pyproject.toml b/mcp-servers/python/data_analysis_server/pyproject.toml
index 29125ed8b5..499186e5a1 100644
--- a/mcp-servers/python/data_analysis_server/pyproject.toml
+++ b/mcp-servers/python/data_analysis_server/pyproject.toml
@@ -10,7 +10,7 @@ readme = "README.md"
 requires-python = ">=3.11"
 dependencies = [
     "matplotlib>=3.11.0",
-    "mcp>=1.28.1",
+    "mcp>=1.28.1,<2",
     "numpy>=2.4.4",
     "openpyxl>=3.1.5",
     "orjson>=3.11.9",
diff --git a/mcp-servers/python/data_analysis_server/requirements.txt b/mcp-servers/python/data_analysis_server/requirements.txt
index 7b22b024c3..d9cc46b6ef 100644
--- a/mcp-servers/python/data_analysis_server/requirements.txt
+++ b/mcp-servers/python/data_analysis_server/requirements.txt
@@ -1,5 +1,5 @@
 matplotlib>=3.11.0
-mcp>=1.28.1
+mcp>=1.28.1,<2
 numpy>=2.5.1
 openpyxl>=3.1.5
 pandas>=3.0.3
diff --git a/mcp-servers/python/mcp_eval_server/pyproject.toml b/mcp-servers/python/mcp_eval_server/pyproject.toml
index 8441a4ab3e..daffa6d99d 100644
--- a/mcp-servers/python/mcp_eval_server/pyproject.toml
+++ b/mcp-servers/python/mcp_eval_server/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
     "diskcache>=5.6.3",
     "httpx>=0.28.1",
     "jinja2>=3.1.6",
-    "mcp>=1.28.1",
+    "mcp>=1.28.1,<2",
     "numpy>=2.4.4",
     "openai>=2.44.0",
     "orjson>=3.11.9",
diff --git a/mcp-servers/templates/python/{{cookiecutter.project_slug}}/pyproject.toml b/mcp-servers/templates/python/{{cookiecutter.project_slug}}/pyproject.toml
index ee642f3d39..5defc3bb93 100644
--- a/mcp-servers/templates/python/{{cookiecutter.project_slug}}/pyproject.toml
+++ b/mcp-servers/templates/python/{{cookiecutter.project_slug}}/pyproject.toml
@@ -9,7 +9,7 @@ license = { text = "{{ cookiecutter.license }}" }
 readme = "README.md"
 requires-python = ">={{ cookiecutter.python_min }}"
 dependencies = [
-  "mcp>=1.0.0",
+  "mcp>=1.0.0,<2",
   "orjson>=3.11.5",
   "pydantic>=2.5.0",
 ]
diff --git a/plugins/external/cedar/pyproject.toml b/plugins/external/cedar/pyproject.toml
index 30ff4916a9..fd2fab46a8 100644
--- a/plugins/external/cedar/pyproject.toml
+++ b/plugins/external/cedar/pyproject.toml
@@ -45,7 +45,7 @@ authors = [
 
 dependencies = [
     "cedarpy>=4.8.7",
-    "mcp>=1.28.1",
+    "mcp>=1.28.1,<2",
     "mcp-contextforge-gateway>=1.0.6",
 ]
 
diff --git a/plugins/external/llmguard/pyproject.toml b/plugins/external/llmguard/pyproject.toml
index 8b2eb2b15a..b1a9b65de0 100644
--- a/plugins/external/llmguard/pyproject.toml
+++ b/plugins/external/llmguard/pyproject.toml
@@ -45,7 +45,7 @@ authors = [
 
 dependencies = [
     "llm-guard>=0.3.16",
-    "mcp>=1.28.1",
+    "mcp>=1.28.1,<2",
     "orjson>=3.11.9",
     "rapidfuzz>=3.14.5",
     "redis>=8.0.1",
diff --git a/plugins/external/opa/pyproject.toml b/plugins/external/opa/pyproject.toml
index 68bc17b4bf..adc1c73bf4 100644
--- a/plugins/external/opa/pyproject.toml
+++ b/plugins/external/opa/pyproject.toml
@@ -45,7 +45,7 @@ authors = [
 
 dependencies = [
     "httpx>=0.28.1",
-    "mcp>=1.28.1",
+    "mcp>=1.28.1,<2",
     "mcp-contextforge-gateway>=1.0.6",
 ]
 
diff --git a/pyproject.toml b/pyproject.toml
index e77466cd93..b85d13997c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -121,7 +121,7 @@ dependencies = [
     "jsonpath-ng>=1.8.0",
     "jsonschema>=4.26.0",
     "Mako>=1.3.12", # Transitive pin (alembic)
-    "mcp>=1.28.1",
+    "mcp>=1.28.1,<2",
     "msgpack>=1.2.1",
     "orjson>=3.11.9",
     "parse>=1.22.1",
diff --git a/uv.lock b/uv.lock
index 9b2d193a99..24ebea17e4 100644
--- a/uv.lock
+++ b/uv.lock
@@ -8,7 +8,7 @@ resolution-markers = [
 ]
 
 [options]
-exclude-newer = "0001-01-01T00:00:00Z" # This has no effect and is included for backwards compatibility when using relative exclude-newer values.
+exclude-newer = "2026-07-14T17:38:27.25747Z"
 exclude-newer-span = "P10D"
 
 [options.exclude-newer-package]
@@ -149,9 +149,9 @@ name = "aiologic"
 version = "0.17.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "sniffio" },
-    { name = "typing-extensions" },
-    { name = "wrapt" },
+    { name = "sniffio", marker = "python_full_version < '3.13'" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+    { name = "wrapt", marker = "python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/f1/7a/d51f2fde1e8ae8a83431f8e97b7a71e9358cdb1d4d2ce6be387fa44d68de/aiologic-0.17.1.tar.gz", hash = "sha256:2e1b93b9e88ced318c2a63ad7b382688f40cbfe40e3d42258d49dc9c5aea179d", size = 252354, upload-time = "2026-06-27T20:41:33.25Z" }
 wheels = [
@@ -1120,8 +1120,8 @@ name = "culsans"
 version = "0.11.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "aiologic" },
-    { name = "typing-extensions" },
+    { name = "aiologic", marker = "python_full_version < '3.13'" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/d9/e3/49afa1bc180e0d28008ec6bcdf82a4072d1c7a41032b5b759b60814ca4b0/culsans-0.11.0.tar.gz", hash = "sha256:0b43d0d05dce6106293d114c86e3fb4bfc63088cfe8ff08ed3fe36891447fe33", size = 107546, upload-time = "2025-12-31T23:15:38.196Z" }
 wheels = [
@@ -3232,7 +3232,7 @@ requires-dist = [
     { name = "langgraph", marker = "extra == 'llmchat'", specifier = "<=1.2.0" },
     { name = "langsmith", marker = "extra == 'llmchat'", specifier = ">=0.8.18" },
     { name = "mako", specifier = ">=1.3.12" },
-    { name = "mcp", specifier = ">=1.28.1" },
+    { name = "mcp", specifier = ">=1.28.1,<2" },
     { name = "mcp-contextforge-gateway", extras = ["redis"], marker = "extra == 'all'", specifier = ">=1.0.6" },
     { name = "mcp-contextforge-gateway", extras = ["redis", "dev", "plugins"], marker = "extra == 'dev-all'", specifier = ">=1.0.6" },
     { name = "memray", marker = "extra == 'profiling'", specifier = ">=1.19.3" },