1 files changed, 1 insertions, 1 deletions

diff --git a/opam b/opam
index c205c1f6..beb4b304 100644
--- a/opam
+++ b/opam
@@ -35,7 +35,7 @@ depends: [
   "omd"
   "conf-gmp"
   "conf-zlib"
-  "base64"
+  "base64" {< "3.0.0"}
   "yojson"
 ]
 available: [ocaml-version >= "4.06.1"]