diff --git a/packages/datakit-ci/datakit-ci.0.11.0/opam b/packages/datakit-ci/datakit-ci.0.11.0/opam
index d374cf3bad0e..04e3c3fbf117 100644
--- a/packages/datakit-ci/datakit-ci.0.11.0/opam
+++ b/packages/datakit-ci/datakit-ci.0.11.0/opam
@@ -42,6 +42,7 @@ depends: [
   "datakit" {with-test & >= "0.11.0"}
   "irmin-unix" {with-test & >= "1.2.0"}
   "alcotest" {with-test}
+  "base64" {<"3.0.0"}
 ]
 synopsis: "Continuous Integration service using DataKit"
 description: """
diff --git a/packages/datakit-ci/datakit-ci.0.12.0/opam b/packages/datakit-ci/datakit-ci.0.12.0/opam
index b886b9202ca5..ba175ddc3395 100644
--- a/packages/datakit-ci/datakit-ci.0.12.0/opam
+++ b/packages/datakit-ci/datakit-ci.0.12.0/opam
@@ -44,6 +44,7 @@ depends: [
   "irmin-unix" {with-test & >= "1.2.0"}
   "alcotest" {with-test}
   "cohttp-lwt-unix" {< "1.0.0"}
+  "base64" {<"3.0.0"}
 ]
 synopsis: "Continuous Integration service using DataKit"
 description: """
diff --git a/packages/datakit-ci/datakit-ci.0.12.1/opam b/packages/datakit-ci/datakit-ci.0.12.1/opam
index 5ece48c9140c..e39e5c5bdad7 100644
--- a/packages/datakit-ci/datakit-ci.0.12.1/opam
+++ b/packages/datakit-ci/datakit-ci.0.12.1/opam
@@ -44,6 +44,7 @@ depends: [
   "irmin-unix" {with-test & >= "1.2.0"}
   "alcotest" {with-test}
   "cohttp-lwt-unix" {>= "1.0.0"}
+  "base64" {<"3.0.0"}
 ]
 synopsis: "Continuous Integration service using DataKit"
 description: """
diff --git a/packages/datakit-ci/datakit-ci.0.12.2/opam b/packages/datakit-ci/datakit-ci.0.12.2/opam
index 960df7ba21ab..8b20769ad38b 100644
--- a/packages/datakit-ci/datakit-ci.0.12.2/opam
+++ b/packages/datakit-ci/datakit-ci.0.12.2/opam
@@ -29,6 +29,7 @@ depends: [
   "session-webmachine" {>= "0.4.0"}
   "redis-lwt"
   "asetmap"
+  "base64" {<"3.0.0"}
   "github-unix" {>= "3.0.0"}
   "prometheus-app"
   "lwt" {>= "3.0.0"}