diff --git a/pkgs/applications/misc/gollum/Gemfile.lock b/pkgs/applications/misc/gollum/Gemfile.lock
index 8ecb546df703..6a705b6a9d82 100644
--- a/pkgs/applications/misc/gollum/Gemfile.lock
+++ b/pkgs/applications/misc/gollum/Gemfile.lock
@@ -6,10 +6,10 @@ GEM
     gemojione (3.3.0)
       json
     github-markup (1.7.0)
-    gitlab-grit (2.8.2)
-      charlock_holmes (~> 0.6)
+    gitlab-grit (2.8.3)
+      charlock_holmes (~> 0.7)
       diff-lcs (~> 1.1)
-      mime-types (>= 1.16)
+      mime-types (>= 1.16, < 3)
       posix-spawn (~> 0.3)
     gollum (4.1.4)
       gemojione (~> 3.2)
@@ -31,15 +31,13 @@ GEM
       twitter-text (= 1.14.7)
     json (2.3.0)
     kramdown (1.9.0)
-    mime-types (3.3)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2019.1009)
+    mime-types (2.99.3)
     mini_portile2 (2.4.0)
     mustache (0.99.8)
-    nokogiri (1.10.7)
+    nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     posix-spawn (0.3.13)
-    rack (1.6.12)
+    rack (1.6.13)
     rack-protection (1.5.5)
       rack
     rouge (2.2.1)
diff --git a/pkgs/applications/misc/gollum/gemset.nix b/pkgs/applications/misc/gollum/gemset.nix
index 61e0db781b87..7ce1d853f368 100644
--- a/pkgs/applications/misc/gollum/gemset.nix
+++ b/pkgs/applications/misc/gollum/gemset.nix
@@ -46,10 +46,10 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0xgs3l81ghlc5nm75n0pz7b2cj3hpscfq5iy27c483nnjn2v5mc4";
+      sha256 = "0xvcizc4856xlvara1zzwl6j61vxxshzcrdagp58xzfl68vbi63p";
       type = "gem";
     };
-    version = "2.8.2";
+    version = "2.8.3";
   };
   gollum = {
     dependencies = ["gemojione" "gollum-lib" "kramdown" "mustache" "sinatra" "useragent"];
@@ -105,25 +105,14 @@
     version = "1.9.0";
   };
   mime-types = {
-    dependencies = ["mime-types-data"];
     groups = ["default"];
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0g7l18igjb9z7q4b2ykvyxyvjxlx5pwsmx5z3ibdbr6372xgfglk";
+      sha256 = "03j98xr0qw2p2jkclpmk7pm29yvmmh0073d8d43ajmr0h3w7i5l9";
       type = "gem";
     };
-    version = "3.3";
-  };
-  mime-types-data = {
-    groups = ["default"];
-    platforms = [];
-    source = {
-      remotes = ["https://rubygems.org"];
-      sha256 = "18x61fc36951vw7f74gq8cyybdpxvyg5d0azvqhrs82ddw3v16xh";
-      type = "gem";
-    };
-    version = "3.2019.1009";
+    version = "2.99.3";
   };
   mini_portile2 = {
     groups = ["default"];
@@ -151,10 +140,10 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0r0qpgf80h764k176yr63gqbs2z0xbsp8vlvs2a79d5r9vs83kln";
+      sha256 = "1yi8j8hwrlc3rg5v3w52gxndmwifyk7m732q9yfbal0qajqbh1h8";
       type = "gem";
     };
-    version = "1.10.7";
+    version = "1.10.8";
   };
   posix-spawn = {
     groups = ["default"];
@@ -171,10 +160,10 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1riq0z408dwvqcqrpq05bp2w879l4sjxzb4cbrbx55kpi6h2g1cj";
+      sha256 = "0wr1f3g9rc9i8svfxa9cijajl1661d817s56b2w7rd572zwn0zi0";
       type = "gem";
     };
-    version = "1.6.12";
+    version = "1.6.13";
   };
   rack-protection = {
     dependencies = ["rack"];