diff --git a/carton-git.opam b/carton-git.opam
index ce8fb4a18..2a7e1b697 100644
--- a/carton-git.opam
+++ b/carton-git.opam
@@ -29,7 +29,7 @@ depends: [
   "fpath"
   "result"
   "mmap"
-  "fmt"
+  "fmt"        {>= "0.8.7"}
   "base-unix"
   "decompress" {>= "1.2.0"}
 ]
diff --git a/carton.opam b/carton.opam
index dfc647486..d05377b4a 100644
--- a/carton.opam
+++ b/carton.opam
@@ -33,7 +33,7 @@ depends: [
   "logs"
   "bigstringaf"
   "psq"          {>= "0.2.0"}
-  "fmt"
+  "fmt"          {>= "0.8.7"}
   "result"       {with-test}
   "rresult"      {with-test}
   "fpath"        {with-test}
diff --git a/git-nss.opam b/git-nss.opam
index 1fe6168a6..c4e06cd0e 100644
--- a/git-nss.opam
+++ b/git-nss.opam
@@ -21,11 +21,10 @@ depends: [
   "stdlib-shims"
   "rresult"
   "result"
-  "fmt"
+  "fmt"               {>= "0.8.7"}
   "cstruct"           {>= "5.0.0"}
   "domain-name"
   "astring"
-  "fmt"
   "logs"
   "psq"               {>= "0.2.0"}
   "carton"
diff --git a/git-unix.opam b/git-unix.opam
index f86975528..de8d048af 100644
--- a/git-unix.opam
+++ b/git-unix.opam
@@ -27,7 +27,7 @@ depends: [
   "result"
   "bigarray-compat"
   "bigstringaf"
-  "fmt"
+  "fmt"               {>= "0.8.7"}
   "git-nss"
   "bos"
   "fpath"
diff --git a/git.opam b/git.opam
index 36bb1fef4..633259b67 100644
--- a/git.opam
+++ b/git.opam
@@ -43,7 +43,7 @@ depends: [
   "carton-lwt"
   "carton-git"
   "ke"                {>= "0.4"}
-  "fmt"
+  "fmt"               {>= "0.8.7"}
   "checkseum"         {>= "0.2.1"}
   "ocamlgraph"        {>= "1.8.8"}
   "astring"