diff --git a/dev/build/Dockerfile b/dev/build/Dockerfile
index d3b186e1f5..ae59ba1440 100644
--- a/dev/build/Dockerfile
+++ b/dev/build/Dockerfile
@@ -1,4 +1,4 @@
-FROM ghcr.io/ietf-tools/datatracker-app-base:20250903T2216
+FROM ghcr.io/ietf-tools/datatracker-app-base:20251201T1548
 LABEL maintainer="IETF Tools Team <tools-discuss@ietf.org>"
 
 ENV DEBIAN_FRONTEND=noninteractive
diff --git a/dev/build/TARGET_BASE b/dev/build/TARGET_BASE
index 9d8427efdb..726f080c67 100644
--- a/dev/build/TARGET_BASE
+++ b/dev/build/TARGET_BASE
@@ -1 +1 @@
-20250903T2216
+20251201T1548
diff --git a/patch/django-cookie-delete-with-all-settings.patch b/patch/django-cookie-delete-with-all-settings.patch
index fb8bbbe4fe..4ceaf8fceb 100644
--- a/patch/django-cookie-delete-with-all-settings.patch
+++ b/patch/django-cookie-delete-with-all-settings.patch
@@ -9,9 +9,9 @@
                  samesite=settings.SESSION_COOKIE_SAMESITE,
              )
  
---- django/http/response.py.orig	2020-08-13 11:16:04.060627793 +0200
-+++ django/http/response.py	2020-08-13 11:54:03.482476973 +0200
-@@ -282,20 +282,28 @@
+--- django/http/response.py.orig	2025-12-02 22:12:05.197283001 +0000
++++ django/http/response.py	2025-12-02 22:26:01.396576013 +0000
+@@ -286,20 +286,28 @@
          value = signing.get_cookie_signer(salt=key + salt).sign(value)
          return self.set_cookie(key, value, **kwargs)