diff --git a/docs/lecture12d-phasespace.ipynb b/docs/lecture12d-phasespace.ipynb
index 24d0ed4..47e3ccd 100644
--- a/docs/lecture12d-phasespace.ipynb
+++ b/docs/lecture12d-phasespace.ipynb
@@ -31,7 +31,7 @@
    },
    "outputs": [],
    "source": [
-    "%pip install -q gdown matplotlib numpy phasespace pylorentz"
+    "%pip install -q gdown matplotlib numpy phasespace pylorentz tf-keras"
    ]
   },
   {
@@ -559,7 +559,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.12"
+   "version": "3.10.14"
   }
  },
  "nbformat": 4,