diff --git a/CHANGELOG.md b/CHANGELOG.md
index 782fca2..da5dd7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,7 +10,9 @@ list yields a list of all related PRs for each release.
 
 # [unreleased]
 
-# [v3.2.0] to be released
+# [v4.0.0] to be released
+
+`tmtccmd` version: v5.0.0a0
 
 ## Added
 
@@ -21,6 +23,7 @@ list yields a list of all related PRs for each release.
 ## Fixed
 
 - Fix for PLOC power switching.
+- Bump `tmtccmd` to v5.0.0a0 for important bugfix in CFDP header.
 
 # [v3.1.1] 2023-04-17
 
diff --git a/eive_tmtc/tmtc/power/tm.py b/eive_tmtc/tmtc/power/tm.py
index 7dc236a..dd93cf6 100644
--- a/eive_tmtc/tmtc/power/tm.py
+++ b/eive_tmtc/tmtc/power/tm.py
@@ -150,11 +150,9 @@ def handle_pdu_data(pw: PrintWrapper, pdu_idx: int, set_id: int, hk_data: bytes)
     current_idx = 0
     priv_idx = pdu_idx - 1
     if set_id == SetId.AUX or set_id == SetId.AUX:
-        fmt_str = "!hhBBBIIH"
+        fmt_str = "!BBBIIH"
         inc_len = struct.calcsize(fmt_str)
         (
-            vcc,
-            vbat,
             conv_enb_0,
             conv_enb_1,
             conv_enb_2,
@@ -162,7 +160,6 @@ def handle_pdu_data(pw: PrintWrapper, pdu_idx: int, set_id: int, hk_data: bytes)
             uptime,
             reset_cause,
         ) = struct.unpack(fmt_str, hk_data[current_idx : current_idx + inc_len])
-        pw.dlog(f"VCC {vcc} mV | VBAT {vbat} mV")
         pw.dlog(f"Converter Enables [{conv_enb_0},{conv_enb_1},{conv_enb_2}]")
         pw.dlog(
             f"Boot Cause {boot_cause} | Uptime {uptime} | Reset Cause {reset_cause}",
@@ -213,14 +210,14 @@ def handle_pdu_data(pw: PrintWrapper, pdu_idx: int, set_id: int, hk_data: bytes)
                 f"{voltage_list[idx]:05} | {current_list[idx]:04}"
             )
             pw.dlog(content_line)
-        fmt_str = "!IBf"
+        fmt_str = "!IBfhh"
         inc_len = struct.calcsize(fmt_str)
-        (boot_count, batt_mode, temperature) = struct.unpack(
+        (boot_count, batt_mode, temperature, vcc, vbat) = struct.unpack(
             fmt_str, hk_data[current_idx : current_idx + inc_len]
         )
         info = (
             f"Boot Count {boot_count} | Battery Mode {batt_mode} | "
-            f"Temperature {temperature}"
+            f"Temperature {temperature} | VCC {vcc} | VBAT {vbat}"
         )
         pw.dlog(info)
 
diff --git a/pyproject.toml b/pyproject.toml
index c1ef478..a9fb0e1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ classifiers = [
     "Topic :: Scientific/Engineering"
 ]
 dependencies = [
-	"tmtccmd ~= 4.1",
+	"tmtccmd ~= 5.0.0a0",
 	"python-dateutil ~= 2.8",
 	# tmtccmd @ git+https://github.com/robamu-org/tmtccmd@<gitRev>#egg=tmtccmd
 ]