diff --git a/dune-project b/dune-project
index 3b3c0c85..af22ef06 100644
--- a/dune-project
+++ b/dune-project
@@ -35,7 +35,7 @@
     (ocaml (>= 4.08))
     (odoc :with-doc)
     (yojson (>= 1.6))
-    (base64 (>= 2.0)) )
+    (base64 (>= 3.0)) )
   (tags (protobuf encode decode)))
 
 (package
diff --git a/pbrt_yojson.opam b/pbrt_yojson.opam
index 46d844d8..031800a4 100644
--- a/pbrt_yojson.opam
+++ b/pbrt_yojson.opam
@@ -14,7 +14,7 @@ depends: [
   "ocaml" {>= "4.08"}
   "odoc" {with-doc}
   "yojson" {>= "1.6"}
-  "base64" {>= "2.0"}
+  "base64" {>= "3.0"}
 ]
 build: [
   ["dune" "subst"] {pinned}