diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ac05110d..7dd086f3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -38,13 +38,15 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - k3s: v1.26
+          # All k3s after January 2024 break our e2e tests, we hardcode
+          # the versions for now until we can fix the source of this.
+          - k3s: v1.26.12+k3s1
             k8s-test: v1.26.12
-          - k3s: v1.27
+          - k3s: v1.27.9+k3s1
             k8s-test: v1.27.9
-          - k3s: v1.28
+          - k3s: v1.28.5+k3s1
             k8s-test: v1.28.5
-          - k3s: v1.29
+          - k3s: v1.29.0+k3s1
             k8s-test: v1.29.0
 
     steps:
@@ -70,7 +72,7 @@ jobs:
 
       - name: Run tests
         env:
-          K3S_CHANNEL: ${{ matrix.k3s }}
+          K3S_VERSION: ${{ matrix.k3s }}
           K8S_TEST_VERSION: ${{ matrix.k8s-test }}
           SCOPE: gha-${{ github.run_id }}-${{ github.run_attempt }}-${{ matrix.k3s }}
         run: |
diff --git a/hack/dev-up.sh b/hack/dev-up.sh
index 3a2bed5a..943258ed 100755
--- a/hack/dev-up.sh
+++ b/hack/dev-up.sh
@@ -25,7 +25,10 @@ if [[ -n "${DEBUG:-}" ]]; then set -x; fi
   location=${LOCATION:-fsn1}
   network_zone=${NETWORK_ZONE:-eu-central}
   ssh_keys=${SSH_KEYS:-}
-  channel=${K3S_CHANNEL:-stable}
+  # All k3s after January 2024 break our e2e tests, we hardcode
+  # the versions for now until we can fix the source of this.
+  # channel=${K3S_CHANNEL:-stable}
+  k3s_version=${K3S_VERSION:-v1.28.5+k3s1}
   network_cidr=${NETWORK_CIDR:-10.0.0.0/8}
   subnet_cidr=${SUBNET_CIDR:-10.0.0.0/24}
   cluster_cidr=${CLUSTER_CIDR:-10.244.0.0/16}
@@ -99,7 +102,7 @@ if [[ -n "${DEBUG:-}" ]]; then set -x; fi
 
       if [[ "$num" == "1" ]]; then
         # First node is control plane.
-        k3sup install --print-config=false --ip $ip --k3s-channel $channel --k3s-extra-args "${k3s_server_opts} ${k3s_opts} ${k3s_node_ip_opts}" --local-path $KUBECONFIG --ssh-key $ssh_private_key
+        k3sup install --print-config=false --ip $ip --k3s-version "${k3s_version}" --k3s-extra-args "${k3s_server_opts} ${k3s_opts} ${k3s_node_ip_opts}" --local-path $KUBECONFIG --ssh-key $ssh_private_key
       else
         # All subsequent nodes are initialized as workers.
 
@@ -108,7 +111,7 @@ if [[ -n "${DEBUG:-}" ]]; then set -x; fi
           sleep 1
         done
 
-        k3sup join --server-ip $(hcloud server ip $scope_name-1) --ip $ip --k3s-channel $channel --k3s-extra-args "${k3s_opts} ${k3s_node_ip_opts}" --ssh-key $ssh_private_key
+        k3sup join --server-ip $(hcloud server ip $scope_name-1) --ip $ip --k3s-version "${k3s_version}" --k3s-extra-args "${k3s_opts} ${k3s_node_ip_opts}" --ssh-key $ssh_private_key
       fi
     ) &