diff --git a/pkgs/applications/version-management/redmine/Gemfile.lock b/pkgs/applications/version-management/redmine/Gemfile.lock
index 7d83583c019d..c660e73f4a0f 100644
--- a/pkgs/applications/version-management/redmine/Gemfile.lock
+++ b/pkgs/applications/version-management/redmine/Gemfile.lock
@@ -50,7 +50,7 @@ GEM
     jquery-rails (2.0.3)
       railties (>= 3.1.0, < 5.0)
       thor (~> 0.14)
-    json (1.8.1)
+    json (1.8.3)
     mail (2.5.4)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
diff --git a/pkgs/applications/version-management/redmine/Gemfile.nix b/pkgs/applications/version-management/redmine/Gemfile.nix
index a7339097b146..77adfba334ec 100644
--- a/pkgs/applications/version-management/redmine/Gemfile.nix
+++ b/pkgs/applications/version-management/redmine/Gemfile.nix
@@ -115,9 +115,9 @@ version = "2.0.3";
 }
 {
 name = "json";
-hash = "961bfbbfa9fda1e857e9c791e964e6664e0d43bf687b19669dfbc7cdbc5e0200";
-url = "http://rubygems.org/downloads/json-1.8.1.gem";
-version = "1.8.1";
+hash = "1nsby6ry8l9xg3yw4adlhk2pnc7i0h0rznvcss4vk3v74qg0k8lc";
+url = "http://rubygems.org/downloads/json-1.8.3.gem";
+version = "1.8.3";
 }
 {
 name = "mail";