diff --git a/.github/workflows/docker-deploy.yml b/.github/workflows/docker-deploy.yml
index 6659829..91cdfea 100644
--- a/.github/workflows/docker-deploy.yml
+++ b/.github/workflows/docker-deploy.yml
@@ -21,13 +21,10 @@ jobs:
     name: Create tag
     outputs:
       tag: ${{ steps.date.outputs.tag }}
-      snapshot_date: ${{ steps.date.outputs.snapshot_date }}
     steps:
       - name: Get date
         id: date
         run: |
-          export SNAPSHOT_DATE=$(basename $(curl -ILs -o /dev/null -w %{url_effective} http://snapshot.debian.org/archive/debian/$(date -u +%Y%m%dT%H%M00Z)/) )
-          echo "snapshot_date=${SNAPSHOT_DATE}" >> $GITHUB_OUTPUT
           echo "tag=$(date '+%Y_%m_%d')" >> $GITHUB_OUTPUT
 
   # There is unfortunately no point in parallelising the build of the different
@@ -40,17 +37,16 @@ jobs:
     needs: tag
     env:
       TAG: ${{ needs.tag.outputs.tag }}
-      SNAPSHOT_DATE: ${{ needs.tag.outputs.snapshot_date }}
     steps:
     - uses: actions/checkout@v4
     - name: "Build trustworthysystems/sel4"
       run: |
-        ./build.sh -e SNAPSHOT_DATE=${SNAPSHOT_DATE} -v -b sel4
+        ./build.sh -v -b sel4
         docker tag trustworthysystems/sel4:latest trustworthysystems/sel4:${TAG}-amd64
     # the following will also build the plain camkes image:
     - name: "Build trustworthysystems/camkes-cakeml-rust"
       run: |
-       ./build.sh -e SNAPSHOT_DATE=${SNAPSHOT_DATE} -v -b camkes -s cakeml -s rust
+       ./build.sh -v -b camkes -s cakeml -s rust
        docker tag trustworthysystems/camkes:latest trustworthysystems/camkes:${TAG}-amd64
        docker tag trustworthysystems/camkes-cakeml-rust:latest \
                   trustworthysystems/camkes-cakeml-rust:${TAG}-amd64
@@ -88,7 +84,6 @@ jobs:
     needs: tag
     env:
       TAG: ${{ needs.tag.outputs.tag }}
-      SNAPSHOT_DATE: ${{ needs.tag.outputs.snapshot_date }}
     steps:
     - name: Authenticate
       if: ${{ github.repository_owner == 'seL4' }}
@@ -103,12 +98,12 @@ jobs:
     - uses: actions/checkout@v4
     - name: "Build trustworthysystems/sel4"
       run: |
-        ./build.sh -e SNAPSHOT_DATE=${SNAPSHOT_DATE} -vr -b sel4
+        ./build.sh -vr -b sel4
         docker tag trustworthysystems/sel4:latest trustworthysystems/sel4:${TAG}-arm64
     # the following will also build the plain camkes image:
     - name: "Build trustworthysystems/camkes-cakeml-rust"
       run: |
-       ./build.sh -e SNAPSHOT_DATE=${SNAPSHOT_DATE} -vr -b camkes -s cakeml -s rust
+       ./build.sh -vr -b camkes -s cakeml -s rust
        docker tag trustworthysystems/camkes:latest trustworthysystems/camkes:${TAG}-arm64
        docker tag trustworthysystems/camkes-cakeml-rust:latest \
                   trustworthysystems/camkes-cakeml-rust:${TAG}-arm64
@@ -139,7 +134,6 @@ jobs:
     needs: [tag, build-amd64]
     env:
       TAG: ${{ needs.tag.outputs.tag }}
-      SNAPSHOT_DATE: ${{ needs.tag.outputs.snapshot_date }}
     steps:
     - uses: actions/checkout@v4
 
@@ -147,7 +141,7 @@ jobs:
       run: |
         docker pull trustworthysystems/camkes:${TAG}-amd64
         docker tag trustworthysystems/camkes:${TAG}-amd64 trustworthysystems/camkes:latest
-        ./build.sh -e SNAPSHOT_DATE=${SNAPSHOT_DATE} -v -b l4v
+        ./build.sh -v -b l4v
         docker tag trustworthysystems/l4v:latest trustworthysystems/l4v:${TAG}
 
     - name: Authenticate
diff --git a/build.sh b/build.sh
index 708b4ab..9a578f8 100755
--- a/build.sh
+++ b/build.sh
@@ -13,7 +13,7 @@ set -ef
 : "${DOCKERHUB:=trustworthysystems/}"
 
 # Base images
-: "${DEBIAN_IMG:=debian:bullseye-20210816-slim}"
+: "${DEBIAN_IMG:=debian:bullseye-slim}"
 : "${BASETOOLS_IMG:=base_tools}"
 
 # Core images
diff --git a/dockerfiles/apply-binary_decomp.Dockerfile b/dockerfiles/apply-binary_decomp.Dockerfile
index 72a7692..28861cf 100644
--- a/dockerfiles/apply-binary_decomp.Dockerfile
+++ b/dockerfiles/apply-binary_decomp.Dockerfile
@@ -16,7 +16,7 @@ LABEL MAINTAINER="Luke Mondy (luke.mondy@data61.csiro.au)"
 # They can be modified at docker build time via '--build-arg VAR="something"'
 ARG SCM
 ARG DESKTOP_MACHINE=no
-ARG USE_DEBIAN_SNAPSHOT=yes
+ARG USE_DEBIAN_SNAPSHOT
 ARG MAKE_CACHES=yes
 ARG SMTSOLVERS_DIR="/smtsolvers"
 
diff --git a/dockerfiles/apply-camkes_vis.Dockerfile b/dockerfiles/apply-camkes_vis.Dockerfile
index 7dcf113..65a9fad 100644
--- a/dockerfiles/apply-camkes_vis.Dockerfile
+++ b/dockerfiles/apply-camkes_vis.Dockerfile
@@ -16,7 +16,7 @@ LABEL MAINTAINER="Luke Mondy (luke.mondy@data61.csiro.au)"
 # They can be modified at docker build time via '--build-arg VAR="something"'
 ARG SCM
 ARG DESKTOP_MACHINE=no
-ARG USE_DEBIAN_SNAPSHOT=yes
+ARG USE_DEBIAN_SNAPSHOT
 ARG MAKE_CACHES=yes
 
 ARG SCRIPT=apply-camkes_vis.sh
diff --git a/dockerfiles/apply-tex.Dockerfile b/dockerfiles/apply-tex.Dockerfile
index 1a9a366..a729d09 100644
--- a/dockerfiles/apply-tex.Dockerfile
+++ b/dockerfiles/apply-tex.Dockerfile
@@ -16,7 +16,7 @@ LABEL MAINTAINER="Gerwin Klein <gerwin.klein@proofcraft.systems>"
 # They can be modified at docker build time via '--build-arg VAR="something"'
 ARG SCM
 ARG DESKTOP_MACHINE=no
-ARG USE_DEBIAN_SNAPSHOT=yes
+ARG USE_DEBIAN_SNAPSHOT
 ARG MAKE_CACHES=yes
 
 ARG SCRIPT=apply-tex.sh
diff --git a/dockerfiles/base_tools.Dockerfile b/dockerfiles/base_tools.Dockerfile
index 2a6df9e..84a73c0 100644
--- a/dockerfiles/base_tools.Dockerfile
+++ b/dockerfiles/base_tools.Dockerfile
@@ -15,7 +15,7 @@ LABEL MAINTAINER="Luke Mondy (luke.mondy@data61.csiro.au)"
 # They can be modified at docker build time via '--build-arg VAR="something"'
 ARG SCM
 ARG DESKTOP_MACHINE=no
-ARG USE_DEBIAN_SNAPSHOT=yes
+ARG USE_DEBIAN_SNAPSHOT
 ARG SNAPSHOT_DATE
 ARG MAKE_CACHES=yes
 
diff --git a/dockerfiles/camkes.Dockerfile b/dockerfiles/camkes.Dockerfile
index 230e476..d8fb801 100644
--- a/dockerfiles/camkes.Dockerfile
+++ b/dockerfiles/camkes.Dockerfile
@@ -14,7 +14,7 @@ LABEL MAINTAINER="Luke Mondy (luke.mondy@data61.csiro.au)"
 # ARGS are env vars that are *only available* during the docker build
 # They can be modified at docker build time via '--build-arg VAR="something"'
 ARG SCM
-ARG USE_DEBIAN_SNAPSHOT=yes
+ARG USE_DEBIAN_SNAPSHOT
 ARG DESKTOP_MACHINE=no
 ARG MAKE_CACHES=yes
 ARG STACK_ROOT=/etc/stack
diff --git a/dockerfiles/l4v.Dockerfile b/dockerfiles/l4v.Dockerfile
index 899e75c..05bdbc3 100644
--- a/dockerfiles/l4v.Dockerfile
+++ b/dockerfiles/l4v.Dockerfile
@@ -21,7 +21,7 @@ ENV NEW_ISABELLE_SETTINGS "/tmp/isabelle_settings"
 # They can be modified at docker build time via '--build-arg VAR="something"'
 ARG SCM
 ARG DESKTOP_MACHINE=no
-ARG USE_DEBIAN_SNAPSHOT=yes
+ARG USE_DEBIAN_SNAPSHOT
 ARG MAKE_CACHES=yes
 
 COPY scripts /tmp/
diff --git a/dockerfiles/sel4.Dockerfile b/dockerfiles/sel4.Dockerfile
index b047fd4..2bc7e74 100644
--- a/dockerfiles/sel4.Dockerfile
+++ b/dockerfiles/sel4.Dockerfile
@@ -15,7 +15,7 @@ LABEL MAINTAINER="Luke Mondy (luke.mondy@data61.csiro.au)"
 # They can be modified at docker build time via '--build-arg VAR="something"'
 ARG SCM
 ARG DESKTOP_MACHINE=no
-ARG USE_DEBIAN_SNAPSHOT=yes
+ARG USE_DEBIAN_SNAPSHOT
 ARG MAKE_CACHES=yes
 
 ARG SCRIPT=sel4.sh
diff --git a/scripts/utils/common.sh b/scripts/utils/common.sh
index 3b41319..d3da820 100644
--- a/scripts/utils/common.sh
+++ b/scripts/utils/common.sh
@@ -14,7 +14,7 @@ set -exuo pipefail
 : "${DEBIAN_FRONTEND:=noninteractive}"
 export DEBIAN_FRONTEND
 
-: "${USE_DEBIAN_SNAPSHOT:=yes}"
+: "${USE_DEBIAN_SNAPSHOT:=no}"
 export USE_DEBIAN_SNAPSHOT
 
 # Common vars