diff --git a/Dockerfile b/Dockerfile
index 1d516767c36..a67806e9f1d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile-upstream:master-labs
 FROM amazonlinux:2023
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 WORKDIR /PrairieLearn
 
diff --git a/graders/c/Dockerfile b/graders/c/Dockerfile
index 18fd9dd43e0..1203177fa2f 100644
--- a/graders/c/Dockerfile
+++ b/graders/c/Dockerfile
@@ -1,5 +1,5 @@
 FROM ubuntu:24.04
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 LABEL maintainer="jonatan@yorku.ca"
 
diff --git a/graders/java/Dockerfile b/graders/java/Dockerfile
index 116aa24af37..6873b27f7f6 100644
--- a/graders/java/Dockerfile
+++ b/graders/java/Dockerfile
@@ -1,5 +1,5 @@
 FROM ubuntu:24.04
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 LABEL maintainer="jonatan@yorku.ca"
 
diff --git a/graders/python/Dockerfile b/graders/python/Dockerfile
index 8edf502bbe3..0d671b1e272 100644
--- a/graders/python/Dockerfile
+++ b/graders/python/Dockerfile
@@ -1,5 +1,5 @@
 FROM amazonlinux:2023
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 # Needed to properly handle UTF-8
 ENV PYTHONIOENCODING=UTF-8
diff --git a/graders/r/Dockerfile b/graders/r/Dockerfile
index c2db36edb75..616c892c0c3 100644
--- a/graders/r/Dockerfile
+++ b/graders/r/Dockerfile
@@ -23,7 +23,7 @@
 # r2u now supports arm64 binaries to this container can be built for multiple tags.
 
 FROM rocker/r2u:24.04
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 # Needed to properly handle UTF-8
 ENV PYTHONIOENCODING=UTF-8
diff --git a/images/executor/Dockerfile b/images/executor/Dockerfile
index 2d2fda8ca9e..a3328ac1b38 100644
--- a/images/executor/Dockerfile
+++ b/images/executor/Dockerfile
@@ -1,5 +1,5 @@
 FROM prairielearn/prairielearn:latest
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 WORKDIR /PrairieLearn/
 
diff --git a/workspaces/desktop/Dockerfile b/workspaces/desktop/Dockerfile
index 1b76e0ef971..c0fdc6a9d74 100644
--- a/workspaces/desktop/Dockerfile
+++ b/workspaces/desktop/Dockerfile
@@ -1,5 +1,5 @@
 FROM ubuntu:24.04
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 ENV DEBIAN_FRONTEND noninteractive
 COPY pre-install.sh /pre-install.sh
diff --git a/workspaces/jupyterlab-base/Dockerfile b/workspaces/jupyterlab-base/Dockerfile
index cfc612b11cc..577b0867252 100644
--- a/workspaces/jupyterlab-base/Dockerfile
+++ b/workspaces/jupyterlab-base/Dockerfile
@@ -1,5 +1,5 @@
 FROM quay.io/jupyter/minimal-notebook:2025-08-04
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 ENV XDG_DATA_HOME=/tmp/local/share
 ENV XDG_CACHE_HOME=/tmp/cache
diff --git a/workspaces/jupyterlab-python/Dockerfile b/workspaces/jupyterlab-python/Dockerfile
index 168eab1ec99..25bc7b9474b 100644
--- a/workspaces/jupyterlab-python/Dockerfile
+++ b/workspaces/jupyterlab-python/Dockerfile
@@ -1,5 +1,5 @@
 FROM prairielearn/workspace-jupyterlab-base:latest
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 USER root
 COPY install.sh requirements.txt /
diff --git a/workspaces/jupyterlab-r/Dockerfile b/workspaces/jupyterlab-r/Dockerfile
index 7df9dc56e2c..3550ff55e22 100644
--- a/workspaces/jupyterlab-r/Dockerfile
+++ b/workspaces/jupyterlab-r/Dockerfile
@@ -1,5 +1,5 @@
 FROM prairielearn/workspace-jupyterlab-base:latest
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 USER root
 COPY install.sh /
diff --git a/workspaces/rstudio/Dockerfile b/workspaces/rstudio/Dockerfile
index f1a60622482..a686f28d13c 100644
--- a/workspaces/rstudio/Dockerfile
+++ b/workspaces/rstudio/Dockerfile
@@ -45,7 +45,7 @@
 # Their site has more documentation.
 
 FROM rocker/rstudio:4.5.1
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 # On PL, we need to use 1001:1001 for the default user account. We adjust the
 # pre-existing rstudio user which is typically uid 1000 otherwise.
diff --git a/workspaces/vscode-base/Dockerfile b/workspaces/vscode-base/Dockerfile
index 4528322e1b5..58e7d187c42 100644
--- a/workspaces/vscode-base/Dockerfile
+++ b/workspaces/vscode-base/Dockerfile
@@ -1,6 +1,6 @@
 # noble is the codename for Ubuntu 24.04 LTS
 FROM codercom/code-server:4.103.2-noble
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 # On PL, we want to standardize on using 1001:1001 for the user. We change the
 # "coder" account's UID and GID here so that fixuid has no work to do later.
diff --git a/workspaces/vscode-cpp/Dockerfile b/workspaces/vscode-cpp/Dockerfile
index ee3978189cf..d66a708e5bb 100644
--- a/workspaces/vscode-cpp/Dockerfile
+++ b/workspaces/vscode-cpp/Dockerfile
@@ -1,5 +1,5 @@
 FROM prairielearn/workspace-vscode-base:latest
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 USER root
 RUN apt-get update \
diff --git a/workspaces/vscode-python/Dockerfile b/workspaces/vscode-python/Dockerfile
index 8c54ef61934..8f492c140cc 100644
--- a/workspaces/vscode-python/Dockerfile
+++ b/workspaces/vscode-python/Dockerfile
@@ -1,5 +1,5 @@
 FROM prairielearn/workspace-vscode-base:latest
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 # Run the rest of the build commands in a bash shell in login mode so that
 # conda/mamba shell hooks will work. This also allows images derived from
diff --git a/workspaces/xtermjs/Dockerfile b/workspaces/xtermjs/Dockerfile
index 9913ef5682e..5db0547a859 100644
--- a/workspaces/xtermjs/Dockerfile
+++ b/workspaces/xtermjs/Dockerfile
@@ -1,5 +1,5 @@
 FROM node:24-bookworm
-ARG CACHEBUST=2025-09-15-14-16-01
+ARG CACHEBUST=2026-01-15-14-23-45
 
 RUN apt-get update \
     && apt-get upgrade -y \