diff --git a/.github/workflows/cache.yml b/.github/workflows/cache.yml
index 37536ab05..bf2a14abe 100644
--- a/.github/workflows/cache.yml
+++ b/.github/workflows/cache.yml
@@ -7,7 +7,7 @@ jobs:
   cache:
     runs-on: quantecon-gpu
     container:
-      image: ghcr.io/quantecon/lecture-python-container:cuda-12.6.0-anaconda-2024-10-py312-b
+      image: ghcr.io/quantecon/lecture-python-container:cuda-12.8.1-anaconda-2024-10-py312
       options: --gpus all
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1c3a7bffd..a7acdffc5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,7 +4,7 @@ jobs:
   preview:
     runs-on: quantecon-gpu
     container:
-      image: ghcr.io/quantecon/lecture-python-container:cuda-12.6.0-anaconda-2024-10-py312-b
+      image: ghcr.io/quantecon/lecture-python-container:cuda-12.8.1-anaconda-2024-10-py312
       options: --gpus all
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 2bc105ce6..e1d115769 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -8,7 +8,7 @@ jobs:
     if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags')
     runs-on: quantecon-gpu
     container:
-      image: ghcr.io/quantecon/lecture-python-container:cuda-12.6.0-anaconda-2024-10-py312-b
+      image: ghcr.io/quantecon/lecture-python-container:cuda-12.8.1-anaconda-2024-10-py312
       options: --gpus all
     steps:
       - name: Checkout
diff --git a/lectures/kesten_processes.md b/lectures/kesten_processes.md
index 3c185cccd..95a6afd30 100644
--- a/lectures/kesten_processes.md
+++ b/lectures/kesten_processes.md
@@ -108,7 +108,7 @@ Composite Index for the period 1st January 2006 to 1st November 2019.
 ```{code-cell} python3
 import yfinance as yf
 
-s = yf.download('^IXIC', '2006-1-1', '2019-11-1')['Adj Close']
+s = yf.download('^IXIC', '2006-1-1', '2019-11-1', auto_adjust=False)['Adj Close']
 
 r = s.pct_change()