diff --git a/CHANGES.rst b/CHANGES.rst
index a514658860b77927fec4679be110e14eed4056df..8f200be46211a93eb328cd5d6f5468efe576ff69 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -87,6 +87,9 @@ Node
   an ``unlimited`` option to remove the threshold of RPC connections.
   (MR :gl:`!12324`)
 
+- Reduced the maximum allowed timestamp drift to 1 seconds. It is recommended to
+  use NTP to sync the clock of the node. (MR :gl:`!13198`)
+
 Client
 ------
 
diff --git a/docs/introduction/howtouse.rst b/docs/introduction/howtouse.rst
index 372bcaa47184eb5bf7233099d107ded0455c3631..cd1260970c12bb5662cb3cdc23c5f13ea1bdb4fd 100644
--- a/docs/introduction/howtouse.rst
+++ b/docs/introduction/howtouse.rst
@@ -124,6 +124,14 @@ concurrently and selects the best one based on its fitness (see
    process. Thus, an ``octez-validator`` process can appear while
    monitoring the active processes of the machine.
 
+.. warning::
+
+   To ensure the best conditions to run a node, we recommend users to use `NTP
+   <https://en.wikipedia.org/wiki/Network_Time_Protocol>`__ to avoid clock
+   drift. Clock drift may result in not being able to get recent blocks in case
+   of negative lag time, and in not being able to inject new blocks in case of
+   positive lag time.
+
 Node Identity
 ~~~~~~~~~~~~~
 
diff --git a/src/lib_shell/clock_drift.ml b/src/lib_shell/clock_drift.ml
index 7acbe557e6bff0061a77389acd7f832732b6d87f..5c67fd95ef8fce60420bd10b6219e4b8c807ba0e 100644
--- a/src/lib_shell/clock_drift.ml
+++ b/src/lib_shell/clock_drift.ml
@@ -22,7 +22,7 @@
 (*                                                                           *)
 (*****************************************************************************)
 
-let max_timestamp_drift : Ptime.span = Ptime.Span.of_int_s 5
+let max_timestamp_drift : Ptime.span = Ptime.Span.of_int_s 1
 
 let soon : unit -> Time.Protocol.t =
  fun () ->
diff --git a/tezt/tests/forge_block.ml b/tezt/tests/forge_block.ml
index 2708e329097c5b63600fa88e472c28da20956a36..72f2181395b4fe9fb406886977ae655bb4bd1cc5 100644
--- a/tezt/tests/forge_block.ml
+++ b/tezt/tests/forge_block.ml
@@ -57,7 +57,7 @@ let test_forge_block () : unit =
   Log.info "Test activate proto demo time shifted ok" ;
   let parameter_file = Temp.file (protocol_hash ^ "-parameters.json") in
   Base.write_file parameter_file ~contents:"{}" ;
-  let delta = Ptime.Span.of_int_s (-5) in
+  let delta = Ptime.Span.of_int_s (-1) in
   let* () =
     Client.activate_protocol_and_wait
       ~parameter_file