diff --git a/CHANGES.md b/CHANGES.md
index b150ee1..41a41d3 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -8,6 +8,10 @@
 
 - API: `Contributions.of_json` parameter `~from` is replaced by `~period` (#31, @gpetiot)
 
+### Added
+
+- Display curl requests and responses in debug mode (`-vv` or `--verbosity debug`) (#36, @gpetiot)
+
 ## 1.0.1
 
 ### Fixed
diff --git a/bin/dune b/bin/dune
index 7f8fa6e..9506f36 100644
--- a/bin/dune
+++ b/bin/dune
@@ -2,4 +2,11 @@
  (name main)
  (public_name get-activity)
  (package get-activity)
- (libraries cmdliner dune-build-info get-activity-lib))
+ (libraries
+  cmdliner
+  dune-build-info
+  get-activity-lib
+  logs.cli
+  logs.fmt
+  fmt.cli
+  fmt.tty))
diff --git a/bin/main.ml b/bin/main.ml
index 87288da..f0c1efb 100644
--- a/bin/main.ml
+++ b/bin/main.ml
@@ -43,6 +43,15 @@ let mode = `Normal
 
 open Cmdliner
 
+let setup_log style_renderer level =
+  Fmt_tty.setup_std_outputs ?style_renderer ();
+  Logs.set_level level;
+  Logs.set_reporter (Logs_fmt.reporter ());
+  ()
+
+let setup_log =
+  Term.(const setup_log $ Fmt_cli.style_renderer () $ Logs_cli.level ())
+
 let from =
   let doc =
     Arg.info ~docv:"TIMESTAMP" ~doc:"Starting date (ISO8601)." [ "from" ]
@@ -88,11 +97,10 @@ let version =
 
 let info = Cmd.info "get-activity" ~version
 
-let run period user : unit =
+let run () period user : unit =
   match mode with
   | `Normal ->
       Period.with_period period ~last_fetch_file ~f:(fun period ->
-          (* Fmt.pr "period: %a@." Fmt.(pair string string) period; *)
           let* token = get_token () in
           let request = Contributions.request ~period ~user ~token in
           let* contributions = Graphql.exec request in
@@ -112,6 +120,6 @@ let run period user : unit =
       in
       show ~period ~user @@ Yojson.Safe.from_file "activity.json"
 
-let term = Term.(const run $ term_result period $ user)
+let term = Term.(const run $ setup_log $ term_result period $ user)
 let cmd = Cmd.v info term
 let () = Stdlib.exit @@ Cmd.eval cmd
diff --git a/dune-project b/dune-project
index 7e7f63c..eb45f87 100644
--- a/dune-project
+++ b/dune-project
@@ -1,17 +1,27 @@
 (lang dune 2.8)
+
 (name get-activity)
+
 (generate_opam_files true)
-(source (github tarides/get-activity))
+
+(source
+ (github tarides/get-activity))
+
 (authors "talex5@gmail.com")
+
 (maintainers "Guillaume Petiot <guillaume@tarides.com>")
 
 (package
  (name get-activity)
  (synopsis "Collect activity as markdown")
  (depends
-  (cmdliner (>= 1.1.1))
+  (cmdliner
+   (>= 1.1.1))
   dune-build-info
-  (get-activity-lib (= :version))))
+  fmt
+  logs
+  (get-activity-lib
+   (= :version))))
 
 (package
  (name get-activity-lib)
@@ -21,7 +31,11 @@
   (ppx_expect :with-test)
   astring
   curly
-  (fmt (>= 0.8.7))
+  (fmt
+   (>= 0.8.7))
+  logs
   ppx_yojson_conv
-  (yojson (>= 1.6))
-  (ocaml (>= 4.08))))
+  (yojson
+   (>= 1.6))
+  (ocaml
+   (>= 4.08))))
diff --git a/get-activity-lib.opam b/get-activity-lib.opam
index 9a58268..0c5207c 100644
--- a/get-activity-lib.opam
+++ b/get-activity-lib.opam
@@ -12,6 +12,7 @@ depends: [
   "astring"
   "curly"
   "fmt" {>= "0.8.7"}
+  "logs"
   "ppx_yojson_conv"
   "yojson" {>= "1.6"}
   "ocaml" {>= "4.08"}
diff --git a/get-activity.opam b/get-activity.opam
index 45496bd..74200fa 100644
--- a/get-activity.opam
+++ b/get-activity.opam
@@ -9,6 +9,8 @@ depends: [
   "dune" {>= "2.8"}
   "cmdliner" {>= "1.1.1"}
   "dune-build-info"
+  "fmt"
+  "logs"
   "get-activity-lib" {= version}
   "odoc" {with-doc}
 ]
diff --git a/lib/dune b/lib/dune
index 921b990..d96d5c4 100644
--- a/lib/dune
+++ b/lib/dune
@@ -1,6 +1,6 @@
 (library
  (name get_activity)
  (public_name get-activity-lib)
- (libraries astring curly fmt yojson)
+ (libraries astring curly fmt logs yojson)
  (preprocess
   (pps ppx_yojson_conv)))
diff --git a/lib/graphql.ml b/lib/graphql.ml
index af5a7b8..9b95795 100644
--- a/lib/graphql.ml
+++ b/lib/graphql.ml
@@ -24,8 +24,10 @@ let exec request =
   let { meth; url; headers; body } = request in
   let body = Yojson.Safe.to_string body in
   let request = Curly.Request.make ~headers ~body ~url ~meth () in
+  Logs.debug (fun m -> m "request: @[%a@]@." Curly.Request.pp request);
   match Curly.run request with
-  | Ok { Curly.Response.body; _ } -> (
+  | Ok ({ Curly.Response.body; _ } as response) -> (
+      Logs.debug (fun m -> m "response: @[%a@]@." Curly.Response.pp response);
       let json = Yojson.Safe.from_string body in
       match json / "message" with
       | `Null -> Ok json