diff --git a/crates/bin/pcli/src/command/debug.rs b/crates/bin/pcli/src/command/debug.rs
index d3b8b7285d..676a85140f 100644
--- a/crates/bin/pcli/src/command/debug.rs
+++ b/crates/bin/pcli/src/command/debug.rs
@@ -39,7 +39,11 @@ impl DebugCmd {
 #[allow(dead_code)]
 #[derive(Debug, Serialize)]
 pub struct DebugInfo {
+    /// CometBFT version, if cometbft is found on PATH.
+    cometbft_version: Option<String>,
     /// Tendermint version, if tendermint is found on PATH.
+    // Preserved for a while during Tendermint -> CometBFT,
+    // to aid in debugging.
     tendermint_version: Option<String>,
     /// pd version, if pd is found on PATH.
     pd_version: Option<String>,
@@ -59,6 +63,7 @@ impl DebugInfo {
     pub fn new(data_dir: std::path::PathBuf) -> Self {
         let dd = Self::get_pcli_data_directory(data_dir);
         Self {
+            cometbft_version: Self::get_cometbft_version(),
             tendermint_version: Self::get_tendermint_version(),
             pd_version: Self::get_pd_version(),
             pcli_version: Self::get_pcli_version(),
@@ -82,6 +87,20 @@ impl DebugInfo {
             Err(_) => None,
         }
     }
+    /// Attempt to retrieve version info for CometBFT by running
+    /// `cometbft version`. Depending on deployment, cometbft may not be on the PATH;
+    /// it may be in container context that `pcli` doesn't have access to. That's OK:
+    /// we'll just report `None` in that case.
+    fn get_cometbft_version() -> Option<String> {
+        let cmd = Command::new("cometbft").args(["version"]).output();
+        match cmd {
+            Ok(c) => match std::str::from_utf8(&c.stdout) {
+                Ok(o) => Some(o.trim_end().to_string()),
+                Err(_) => None,
+            },
+            Err(_) => None,
+        }
+    }
     /// Return host info, including kernel and architecture. Should work
     /// equally well on Linux or macOS; Windows will return None.
     fn get_uname() -> Option<String> {
diff --git a/deployments/charts/penumbra-metrics/templates/ingress.yaml b/deployments/charts/penumbra-metrics/templates/ingress.yaml
index b7b50deb73..af85065fc8 100644
--- a/deployments/charts/penumbra-metrics/templates/ingress.yaml
+++ b/deployments/charts/penumbra-metrics/templates/ingress.yaml
@@ -49,7 +49,7 @@ spec:
             backend:
               {{- if semverCompare ">=1.19-0" $.Capabilities.KubeVersion.GitVersion }}
               service:
-                name: {{ $fullName }}-tendermint
+                name: {{ $fullName }}-cometbft
                 port:
                   # number: {{ $svcPort }}
                   number: 26657
diff --git a/deployments/charts/penumbra-network/templates/deployment.yaml b/deployments/charts/penumbra-network/templates/deployment.yaml
index 26345c22b9..cce17c62c4 100644
--- a/deployments/charts/penumbra-network/templates/deployment.yaml
+++ b/deployments/charts/penumbra-network/templates/deployment.yaml
@@ -128,7 +128,7 @@ spec:
             {{- toYaml $.Values.resources | nindent 12 }}
           volumeMounts:
             - name: {{ $val_name }}-config
-              subPath: node{{ $i }}/tendermint
+              subPath: node{{ $i }}/cometbft
               mountPath: /cometbft
       {{- with $.Values.nodeSelector }}
       nodeSelector:
diff --git a/deployments/charts/penumbra-network/templates/job-generate.yaml b/deployments/charts/penumbra-network/templates/job-generate.yaml
index ef9f763729..c65678f683 100644
--- a/deployments/charts/penumbra-network/templates/job-generate.yaml
+++ b/deployments/charts/penumbra-network/templates/job-generate.yaml
@@ -85,8 +85,8 @@ spec:
               # set ownership for pd user
               chown -R 1000:1000 /penumbra-config/{{ $val_name }}
 
-              # set ownership for tendermint configs to match tendermint container "tmuser" uid/gid
-              chown -R 100:1000 /penumbra-config/{{ $val_name }}/node{{ $i }}/tendermint
+              # set ownership for cometbft configs to match cometbft container "tmuser" uid/gid
+              chown -R 100:1000 /penumbra-config/{{ $val_name }}/node{{ $i }}/cometbft
 
               ls -lsR /penumbra-config
               {{ end }}
diff --git a/deployments/charts/penumbra-network/values.yaml b/deployments/charts/penumbra-network/values.yaml
index 92ccec211e..9583f8c4f6 100644
--- a/deployments/charts/penumbra-network/values.yaml
+++ b/deployments/charts/penumbra-network/values.yaml
@@ -117,15 +117,6 @@ cometbft:
     - start
     - --proxy_app=tcp://127.0.0.1:26658
 
-tendermint:
-  image:
-    repository: tendermint/tendermint
-    pullPolicy: IfNotPresent
-    # WARNING: other versions of tendermint will fail!
-    tag: "v0.34.23"
-  containerArgs:
-    - start
-    - --proxy_app=tcp://127.0.0.1:26658
 # N.B. Only `IngressRoute`, a custom CRD specific to Traefik ingress controller
 # is supported. This is because a traditional Ingress object doesn't allow us
 # to force a backend scheme of h2c, which is required for pd's gRPC service.
diff --git a/deployments/charts/penumbra-node/templates/deployment.yaml b/deployments/charts/penumbra-node/templates/deployment.yaml
index 40838dd26a..3379ac6705 100644
--- a/deployments/charts/penumbra-node/templates/deployment.yaml
+++ b/deployments/charts/penumbra-node/templates/deployment.yaml
@@ -97,7 +97,7 @@ spec:
                   {{- with $moniker }}
                   --moniker {{ . | quote }} \
                   {{- end }}
-                  {{ $.Values.penumbra_bootstrap_node_tendermint_rpc_url }}
+                  {{ $.Values.penumbra_bootstrap_node_cometbft_rpc_url }}
               fi
 
               # set ownership for pd user
@@ -106,14 +106,14 @@ spec:
               # apply external address. useful for a two-pass deploy, in which external ips
               # are created after first deploy.
               {{- with $external_address }}
-              sed -i -e 's/external_address.*/external_address = "{{ $external_address }}"/' /penumbra-config/testnet_data/node0/tendermint/config/config.toml
+              sed -i -e 's/external_address.*/external_address = "{{ $external_address }}"/' /penumbra-config/testnet_data/node0/cometbft/config/config.toml
               {{- end }}
               {{- with $moniker }}
-              sed -i -e 's/moniker.*/moniker = "{{ $moniker }}"/' /penumbra-config/testnet_data/node0/tendermint/config/config.toml
+              sed -i -e 's/moniker.*/moniker = "{{ $moniker }}"/' /penumbra-config/testnet_data/node0/cometbft/config/config.toml
               {{- end }}
 
-              # set ownership for tendermint configs to match tendermint container "tmuser" uid/gid
-              chown -R 100:1000 /penumbra-config/testnet_data/node0/tendermint
+              # set ownership for cometbft configs to match cometbft container "tmuser" uid/gid
+              chown -R 100:1000 /penumbra-config/testnet_data/node0/cometbft
 
           volumeMounts:
             - name: config
@@ -181,7 +181,7 @@ spec:
           volumeMounts:
             - name: config
               mountPath: /cometbft
-              subPath: testnet_data/node0/tendermint
+              subPath: testnet_data/node0/cometbft
       {{- with $.Values.nodeSelector }}
       nodeSelector:
         {{- toYaml $ | nindent 8 }}
diff --git a/deployments/charts/penumbra-node/templates/ingress.yaml b/deployments/charts/penumbra-node/templates/ingress.yaml
index b7b50deb73..af85065fc8 100644
--- a/deployments/charts/penumbra-node/templates/ingress.yaml
+++ b/deployments/charts/penumbra-node/templates/ingress.yaml
@@ -49,7 +49,7 @@ spec:
             backend:
               {{- if semverCompare ">=1.19-0" $.Capabilities.KubeVersion.GitVersion }}
               service:
-                name: {{ $fullName }}-tendermint
+                name: {{ $fullName }}-cometbft
                 port:
                   # number: {{ $svcPort }}
                   number: 26657
diff --git a/deployments/charts/penumbra-node/templates/tests/test-peers.yaml b/deployments/charts/penumbra-node/templates/tests/test-peers.yaml
index 0f79b84400..e356ff4c26 100644
--- a/deployments/charts/penumbra-node/templates/tests/test-peers.yaml
+++ b/deployments/charts/penumbra-node/templates/tests/test-peers.yaml
@@ -24,7 +24,7 @@ spec:
           n_peers="$(curl -sSf --connect-timeout 5 http://{{ $fn_name }}:26657/net_info | jq -r .result.n_peers)"
           # Ideally we'd check for `count` peers here, but peering will be limited to the number
           # of k8s nodes the Penumbra nodes are spread over, due to 1) k8s node IP being used for egress traffic;
-          # and 2) tendermint rejecting duplicate IPs by default. The real limit here is n_k8s_nodes, but we
+          # and 2) cometbft rejecting duplicate IPs by default. The real limit here is n_k8s_nodes, but we
           # don't know that number in the context of the tests.
           # if [[ "$n_peers" -lt 1 ]] ; then
           if [[ "$n_peers" -lt {{ $count }} ]] ; then
diff --git a/deployments/charts/penumbra-node/values.yaml b/deployments/charts/penumbra-node/values.yaml
index 4248cb95fb..dc098a5707 100644
--- a/deployments/charts/penumbra-node/values.yaml
+++ b/deployments/charts/penumbra-node/values.yaml
@@ -12,7 +12,7 @@ image:
 
 # Penumbra node from which to bootstrap connection. Defaults to testnet.
 # Consider using "preview" for bleeding edge, but make sure container tags match.
-penumbra_bootstrap_node_tendermint_rpc_url: "https://rpc.testnet.penumbra.zone"
+penumbra_bootstrap_node_cometbft_rpc_url: "https://rpc.testnet.penumbra.zone"
 
 # Whether to preserve the LB service, in effect reserving the same IP
 # for subsequent deploys. This costs money! But sure is convenient.
diff --git a/deployments/compose/docker-compose.yml b/deployments/compose/docker-compose.yml
index 96be98b8dc..06d67b7c0d 100644
--- a/deployments/compose/docker-compose.yml
+++ b/deployments/compose/docker-compose.yml
@@ -16,7 +16,7 @@ services:
     command: >-
       sh -c
       "
-      if ! test -e /pd/testnet_data/node0/tendermint/config/config.toml ; then
+      if ! test -e /pd/testnet_data/node0/cometbft/config/config.toml ; then
           >&2 printf 'ERROR: testnet config not found. Run `pd testnet join` on the host machine.'
           >&2 echo ' See docs for details: https://guide.penumbra.zone/main/pd/join-testnet.html'
           exit 1
@@ -32,7 +32,7 @@ services:
       - "8080:8080"
 
   # The CometBFT node
-  tendermint-node0:
+  cometbft-node0:
     image: "docker.io/cometbft/cometbft:v0.34.27"
     user: "${UID:-1000}"
     ports:
@@ -40,7 +40,7 @@ services:
       - "26657:26657"
     volumes:
       - ~/.penumbra/testnet_data/node0/cometbft:/cometbft
-    entrypoint: tendermint
+    entrypoint: cometbft
     command: start --proxy_app=tcp://pd-node0:26658
     environment:
       - ID=0
diff --git a/deployments/helmfile.d/penumbra-devnet.yaml b/deployments/helmfile.d/penumbra-devnet.yaml
index 6d1cab8ee7..539d5f67e5 100644
--- a/deployments/helmfile.d/penumbra-devnet.yaml
+++ b/deployments/helmfile.d/penumbra-devnet.yaml
@@ -34,7 +34,7 @@ releases:
       - image:
           tag: main
       # Communicate intra-cluster to the private validator rpc address.
-      - penumbra_bootstrap_node_tendermint_rpc_url: "http://penumbra-devnet-val-0:26657"
+      - penumbra_bootstrap_node_cometbft_rpc_url: "http://penumbra-devnet-val-0:26657"
       - nodes:
           # We intentionally exclude external IPs in this declaration, but include them
           # in the external vars/ file, which is generated via `./scripts/get-lb-ips penumbra-devnet`.
diff --git a/deployments/helmfile.d/penumbra-preview.yaml b/deployments/helmfile.d/penumbra-preview.yaml
index 68ac777dc1..d384d54330 100644
--- a/deployments/helmfile.d/penumbra-preview.yaml
+++ b/deployments/helmfile.d/penumbra-preview.yaml
@@ -34,7 +34,7 @@ releases:
       - image:
           tag: main
       # Communicate intra-cluster to the private validator rpc address.
-      - penumbra_bootstrap_node_tendermint_rpc_url: "http://penumbra-preview-val-0:26657"
+      - penumbra_bootstrap_node_cometbft_rpc_url: "http://penumbra-preview-val-0:26657"
       - nodes:
           # We intentionally exclude external IPs in this declaration, but include them
           # in the external vars/ file, which is generated via `./scripts/get-lb-ips penumbra-devnet`.
diff --git a/deployments/helmfile.d/penumbra-testnet.yaml b/deployments/helmfile.d/penumbra-testnet.yaml
index 7058f694b7..afda8719cf 100644
--- a/deployments/helmfile.d/penumbra-testnet.yaml
+++ b/deployments/helmfile.d/penumbra-testnet.yaml
@@ -36,7 +36,7 @@ releases:
       - image:
           tag: latest
       # Communicate intra-cluster to the private validator rpc address.
-      - penumbra_bootstrap_node_tendermint_rpc_url: "http://penumbra-testnet-val-0:26657"
+      - penumbra_bootstrap_node_cometbft_rpc_url: "http://penumbra-testnet-val-0:26657"
       - nodes:
           # We intentionally exclude external IPs in this declaration, but include them
           # in the external vars/ file, which is generated via `./scripts/get-lb-ips penumbra-devnet`.
diff --git a/deployments/networks/devnet/helm-values-for-penumbra-devnet.yml b/deployments/networks/devnet/helm-values-for-penumbra-devnet.yml
deleted file mode 100644
index 575fb29b83..0000000000
--- a/deployments/networks/devnet/helm-values-for-penumbra-devnet.yml
+++ /dev/null
@@ -1,16 +0,0 @@
----
-# Values file for devnet deploys.
-ingress:
-  enabled: true
-  hosts:
-    # The Tendermint RPC port.
-    rpc: rpc.devnet.penumbra.zone
-    # The pd gRPC port.
-    grpc: grpc.devnet.penumbra.zone
-    # The Grafana HTTP web interface, for viewing dashboards.
-    grafana: grafana.devnet.penumbra.zone
-
-# Set lower SSD requests; default is 100Gi; we'll do a tenth that
-# for bespoke sandbox environments like 'devnet'.
-persistence:
-  size: 10Gi
diff --git a/deployments/networks/testnet/helm-values-for-penumbra-testnet.yml b/deployments/networks/testnet/helm-values-for-penumbra-testnet.yml
deleted file mode 100644
index 54ad6667ae..0000000000
--- a/deployments/networks/testnet/helm-values-for-penumbra-testnet.yml
+++ /dev/null
@@ -1,12 +0,0 @@
----
-# Values file for "testnet.penumbra.zone" CI deploys.
-# Mostly sets the FQDNs on the ingress.
-ingress:
-  enabled: true
-  hosts:
-    # The Tendermint RPC port.
-    rpc: rpc.testnet.penumbra.zone
-    # The pd gRPC port.
-    grpc: grpc.testnet.penumbra.zone
-    # The Grafana HTTP web interface, for viewing dashboards.
-    grafana: grafana.testnet.penumbra.zone