diff --git a/dev_scripts/apt-tools-prod.pref b/dev_scripts/apt-tools-prod.pref
new file mode 100644
index 0000000..925b51b
--- /dev/null
+++ b/dev_scripts/apt-tools-prod.pref
@@ -0,0 +1,7 @@
+Package: *
+Pin: origin "packages.freedom.press/apt-tools-prod"
+Pin-Priority: 100
+
+Package: conmon
+Pin: origin "packages.freedom.press/apt-tools-prod"
+Pin-Priority: 500
diff --git a/dev_scripts/apt-tools-prod.sources b/dev_scripts/apt-tools-prod.sources
new file mode 100644
index 0000000..6671f95
--- /dev/null
+++ b/dev_scripts/apt-tools-prod.sources
@@ -0,0 +1,71 @@
+Types: deb
+URIs: https://packages.freedom.press/apt-tools-prod
+Suites: jammy
+Components: main
+Signed-By:
+  -----BEGIN PGP PUBLIC KEY BLOCK-----
+  Comment: DE28 AB24 1FA4 8260 FAC9  B8BA A7C9 B385 2260 4281
+  Comment: Dangerzone Release Key <dangerzone-release-key@freedom.
+  .
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+  -----END PGP PUBLIC KEY BLOCK-----
diff --git a/dev_scripts/env.py b/dev_scripts/env.py
index af68c7a..72e8e33 100755
--- a/dev_scripts/env.py
+++ b/dev_scripts/env.py
@@ -115,12 +115,15 @@ DOCKERFILE_UBUNTU_REM_USER = r"""
 RUN touch /var/mail/ubuntu && chown ubuntu /var/mail/ubuntu && userdel -r ubuntu
 """
 
-# On Ubuntu Jammy, use a different conmon version, as acquired from
-# Debian's oldstable proposed updates. For more details, read:
+# On Ubuntu Jammy, use a different conmon version, as acquired from our apt-tools-prod
+# repo. For more details, read:
 # https://github.com/freedomofpress/dangerzone/issues/685
 DOCKERFILE_CONMON_UPDATE = r"""
-COPY oldstable-pu.sources /etc/apt/sources.list.d/
-COPY oldstable-pu.pref /etc/apt/preferences.d/
+RUN apt-get update \
+    && apt-get install -y ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+COPY apt-tools-prod.sources /etc/apt/sources.list.d/
+COPY apt-tools-prod.pref /etc/apt/preferences.d/
 """
 
 # FIXME: Do we really need the python3-venv packages?
@@ -599,11 +602,10 @@ class Env:
         shutil.copy(git_root() / "pyproject.toml", build_dir)
         shutil.copy(git_root() / "poetry.lock", build_dir)
         shutil.copy(git_root() / "dev_scripts" / "storage.conf", build_dir)
-        if self.distro == "ubuntu":
-            shutil.copy(git_root() / "dev_scripts" / "oldstable-pu.pref", build_dir)
+        if self.distro == "ubuntu" and self.version in ("22.04", "jammy"):
+            shutil.copy(git_root() / "dev_scripts" / "apt-tools-prod.pref", build_dir)
             shutil.copy(
-                git_root() / "dev_scripts" / f"oldstable-pu-{self.distro}.sources",
-                build_dir / "oldstable-pu.sources",
+                git_root() / "dev_scripts" / "apt-tools-prod.sources", build_dir
             )
         with open(build_dir / "Dockerfile", mode="w") as f:
             f.write(dockerfile)
@@ -687,11 +689,10 @@ class Env:
         # Populate the build context.
         shutil.copy(package_src, package_dst)
         shutil.copy(git_root() / "dev_scripts" / "storage.conf", build_dir)
-        if self.distro == "ubuntu":
-            shutil.copy(git_root() / "dev_scripts" / "oldstable-pu.pref", build_dir)
+        if self.distro == "ubuntu" and self.version in ("22.04", "jammy"):
+            shutil.copy(git_root() / "dev_scripts" / "apt-tools-prod.pref", build_dir)
             shutil.copy(
-                git_root() / "dev_scripts" / f"oldstable-pu-{self.distro}.sources",
-                build_dir / "oldstable-pu.sources",
+                git_root() / "dev_scripts" / "apt-tools-prod.sources", build_dir
             )
         with open(build_dir / "Dockerfile", mode="w") as f:
             f.write(dockerfile)
diff --git a/dev_scripts/oldstable-pu-ubuntu.sources b/dev_scripts/oldstable-pu-ubuntu.sources
deleted file mode 100644
index 821c983..0000000
--- a/dev_scripts/oldstable-pu-ubuntu.sources
+++ /dev/null
@@ -1,193 +0,0 @@
-Types: deb
-URIs: http://deb.debian.org/debian/
-Suites: oldstable-proposed-updates
-Components: main
-# Taken from Debian 11's FTP master key:
-# https://ftp-master.debian.org/keys.html
-Signed-By:
-  -----BEGIN PGP PUBLIC KEY BLOCK-----
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diff --git a/dev_scripts/oldstable-pu.pref b/dev_scripts/oldstable-pu.pref
deleted file mode 100644
index f3e44e8..0000000
--- a/dev_scripts/oldstable-pu.pref
+++ /dev/null
@@ -1,7 +0,0 @@
-Package: *
-Pin: release a=oldstable-proposed-updates
-Pin-Priority: 100
-
-Package: conmon
-Pin: release a=oldstable-proposed-updates
-Pin-Priority: 500