diff --git a/maintainers/maintainer-list.nix b/maintainers/maintainer-list.nix
index 04658beb7f81..dd42de0651ee 100644
--- a/maintainers/maintainer-list.nix
+++ b/maintainers/maintainer-list.nix
@@ -7293,6 +7293,12 @@
     github = "jorsn";
     githubId = 4646725;
   };
+  joshniemela = {
+    name = "Joshua Niemelä";
+    email = "josh@jniemela.dk";
+    github = "joshniemela";
+    githubId = 88747315;
+  };
   joshuafern = {
     name = "Joshua Fern";
     email = "joshuafern@protonmail.com";
diff --git a/pkgs/development/compilers/julia/1.9.nix b/pkgs/development/compilers/julia/1.9.nix
index 71bf442c82cd..d13b078494ad 100644
--- a/pkgs/development/compilers/julia/1.9.nix
+++ b/pkgs/development/compilers/julia/1.9.nix
@@ -14,11 +14,11 @@
 
 stdenv.mkDerivation rec {
   pname = "julia";
-  version = "1.9.0-beta2";
+  version = "1.9.0-beta4";
 
   src = fetchurl {
     url = "https://github.com/JuliaLang/julia/releases/download/v${version}/julia-${version}-full.tar.gz";
-    hash = "sha256-LTQp5vBMOSlwThYpSIv/UNJ9eIU+WId/XWGFxsrQEzs=";
+    hash = "sha256-Ipfps2wxPV30nbOxDZ0K39jFB1lNz16aXgFhIKBOquM=";
   };
 
   patches = [
@@ -88,7 +88,7 @@ stdenv.mkDerivation rec {
     description = "High-level performance-oriented dynamical language for technical computing";
     homepage = "https://julialang.org/";
     license = licenses.mit;
-    maintainers = with maintainers; [ nickcao ];
+    maintainers = with maintainers; [ nickcao joshniemela ];
     platforms = [ "x86_64-linux" "aarch64-linux" ];
   };
 }