diff --git a/src/cmlxc/container.py b/src/cmlxc/container.py
index a5817e7..28e4202 100644
--- a/src/cmlxc/container.py
+++ b/src/cmlxc/container.py
@@ -493,8 +493,8 @@ def install_deps(self):
                 /root/minitest-venv/bin/pip install \
                     pytest \
                     pytest-xdist \
-                    deltachat-rpc-client \
-                    deltachat-rpc-server \
+                    deltachat-rpc-client==2.49.0 \
+                    deltachat-rpc-server==2.49.0 \
                     imap-tools \
                     requests \
                     python-dotenv \