diff --git a/.github/workflows/test_all_notebooks.yml b/.github/workflows/test_all_notebooks.yml
index b88b02a63..38e514e5b 100644
--- a/.github/workflows/test_all_notebooks.yml
+++ b/.github/workflows/test_all_notebooks.yml
@@ -7,9 +7,6 @@ defaults:
     shell: bash  # To override PowerShell on Windows
 
 on:
-  pull_request:
-    branches:
-      - master
   # Trigger the workflow on manual dispatch and once a week
   workflow_dispatch:
   schedule:
@@ -23,7 +20,7 @@ jobs:
       fail-fast: false  # Continue to run other builds despite a failure
       matrix:
         os: [ubuntu-latest]
-        python-version: [ '3.9', '3.10', '3.11' ]
+        python-version: [ '3.8', '3.9', '3.10', '3.11' ]
         include: # Run windows tests on only one python version
           - os: windows-latest
             python-version:  '3.11'
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 56a737ab2..e1f40a0e4 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -15,7 +15,7 @@ jupytext>=1.12.0, <2.0.0 # for notebook tests
 ipykernel>=5.1.0, <7.0.0 # for notebook tests
 nbconvert>=6.0.7, <8.0.0 # for notebook tests
 catboost>=1.0.0, <2.0.0
-alibi-testing @ git+https://github.com/SeldonIO/alibi-testing@fix/tf-2.15-artifacts#egg=alibi-testing # pre-trained models for testing
+alibi-testing @ git+https://github.com/SeldonIO/alibi-testing@master#egg=alibi-testing # pre-trained models for testing
 # other
 pre-commit>=1.20.0, <4.0.0
 tox>=3.21.0, <5.0.0 # used to generate licence info via `make licenses`