diff --git a/Dockerfile b/Dockerfile
index eeb294b..a39a24c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,6 +14,6 @@ COPY jupyter_mcp_server/* jupyter_mcp_server/
 RUN pip install -e .
 
 RUN pip uninstall -y pycrdt datalayer_pycrdt
-RUN pip install datalayer_pycrdt
+RUN pip install datalayer_pycrdt==0.12.15
 
 CMD ["python", "-m", "jupyter_mcp_server.server"]
diff --git a/README.md b/README.md
index 7d35597..83d7587 100644
--- a/README.md
+++ b/README.md
@@ -23,9 +23,9 @@ Jupyter MCP Server is a [Model Context Protocol](https://modelcontextprotocol.io
 Make sure you have the following installed. The collaboration package is needed as the modifications made on the notebook can be seen thanks to [Jupyter Real Time Collaboration](https://jupyterlab.readthedocs.io/en/stable/user/rtc.html).
 
 ```bash
-pip install jupyterlab jupyter-collaboration ipykernel
+pip install jupyterlab==4.4.1 jupyter-collaboration==4.0.2 ipykernel
 pip uninstall -y pycrdt datalayer_pycrdt
-pip install datalayer_pycrdt
+pip install datalayer_pycrdt==0.12.15
 ```
 
 Then, start JupyterLab with the following command.
diff --git a/jupyter_mcp_server/__version__.py b/jupyter_mcp_server/__version__.py
index ed9e38e..d425a12 100644
--- a/jupyter_mcp_server/__version__.py
+++ b/jupyter_mcp_server/__version__.py
@@ -4,4 +4,4 @@
 
 """Jupyter MCP Server."""
 
-__version__ = "0.3.3"
+__version__ = "0.3.4"
diff --git a/pyproject.toml b/pyproject.toml
index ecaefee..5d34e9b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,8 +21,8 @@ classifiers = [
   "Programming Language :: Python :: 3",
 ]
 dependencies = [
-    "jupyter-kernel-client>=0.6.0",
-    "jupyter-nbmodel-client>=0.11.1",
+    "jupyter-kernel-client==0.6.0",
+    "jupyter-nbmodel-client==0.11.3",
     "mcp[cli]>=1.2.1",
 ]
 
@@ -92,4 +92,4 @@ ignore = [
 
 [tool.ruff.lint.per-file-ignores]
 # S101 Use of `assert` detected
-"jupyter_mcp_server/tests/*" = ["S101"]
\ No newline at end of file
+"jupyter_mcp_server/tests/*" = ["S101"]