diff --git a/caisar.opam b/caisar.opam
index 95e3d04a3add2d52576492bea48e7bda41db7c0c..5eee7cf182e78c896473731db85661c0b7e819e1 100644
--- a/caisar.opam
+++ b/caisar.opam
@@ -19,7 +19,7 @@ depends: [
   "piqilib" {>= "0.6.14"}
   "zarith" {>= "1.7"}
   "ocplib-endian" {>= "1.0"}
-  "base" {>= "v0.14.0"}
+  "base" {>= "v0.15.1"}
   "stdio" {>= "v0.14.0"}
   "cmdliner" {>= "1.1.1"}
   "fmt" {>= "0.8.9"}
diff --git a/dune-project b/dune-project
index 69a82eab7771bf3df95077f4b70c6d63cf0e9547..5cffadaa1fcb085cbe4b78a065875824eaac63e7 100644
--- a/dune-project
+++ b/dune-project
@@ -27,7 +27,7 @@
    (piqilib (>= 0.6.14))
    (zarith (>= 1.7))
    (ocplib-endian (>= 1.0))
-   (base (>= v0.14.0))
+   (base (>= v0.15.1))
    (stdio (>= v0.14.0))
    (cmdliner (>= 1.1.1))
    (fmt (>= 0.8.9))