diff --git a/pkgs/development/libraries/mbedtls/2.nix b/pkgs/development/libraries/mbedtls/2.nix
index 97d62fad3ced..42fb6edae78f 100644
--- a/pkgs/development/libraries/mbedtls/2.nix
+++ b/pkgs/development/libraries/mbedtls/2.nix
@@ -1,6 +1,6 @@
 { callPackage }:
 
 callPackage ./generic.nix {
-  version = "2.28.7";
-  hash = "sha256-JI0Frbz4HkPqrLQNrSIj1ikN8201h4kd1wTwyPotERw=";
+  version = "2.28.8";
+  hash = "sha256-A1DYZrvJ8SRujroVwqPfcTOSgLnT5xRat/RVdq2fL/o=";
 }
diff --git a/pkgs/development/libraries/mbedtls/generic.nix b/pkgs/development/libraries/mbedtls/generic.nix
index 2e79a593b7c3..052a5720cb81 100644
--- a/pkgs/development/libraries/mbedtls/generic.nix
+++ b/pkgs/development/libraries/mbedtls/generic.nix
@@ -21,6 +21,8 @@ stdenv.mkDerivation rec {
     repo = "mbedtls";
     rev = "${pname}-${version}";
     inherit hash;
+    # mbedtls >= 3.6.0 uses git submodules
+    fetchSubmodules = true;
   };
 
   nativeBuildInputs = [ cmake ninja perl python3 ];