diff --git a/pkgs/applications/misc/gollum/Gemfile.lock b/pkgs/applications/misc/gollum/Gemfile.lock
index 7315c0a8d724..f63ffa091a07 100644
--- a/pkgs/applications/misc/gollum/Gemfile.lock
+++ b/pkgs/applications/misc/gollum/Gemfile.lock
@@ -1,26 +1,26 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    charlock_holmes (0.7.3)
+    charlock_holmes (0.7.6)
     diff-lcs (1.3)
     gemojione (3.3.0)
       json
-    github-markup (1.6.1)
-    gitlab-grit (2.8.1)
+    github-markup (1.7.0)
+    gitlab-grit (2.8.2)
       charlock_holmes (~> 0.6)
       diff-lcs (~> 1.1)
-      mime-types (>= 1.16, < 3)
+      mime-types (>= 1.16)
       posix-spawn (~> 0.3)
-    gollum (4.1.2)
+    gollum (4.1.3)
       gemojione (~> 3.2)
-      gollum-lib (>= 4.2.7)
+      gollum-lib (>= 4.2.9)
       kramdown (~> 1.9.0)
       mustache (>= 0.99.5, < 1.0.0)
       sinatra (~> 1.4, >= 1.4.4)
       useragent (~> 0.16.2)
     gollum-grit_adapter (1.0.1)
       gitlab-grit (~> 2.7, >= 2.7.1)
-    gollum-lib (4.2.7)
+    gollum-lib (4.2.9)
       gemojione (~> 3.2)
       github-markup (~> 1.6)
       gollum-grit_adapter (~> 1.0)
@@ -28,27 +28,35 @@ GEM
       rouge (~> 2.1)
       sanitize (~> 2.1)
       stringex (~> 2.6)
+      twitter-text (= 1.14.7)
     json (2.1.0)
     kramdown (1.9.0)
-    mime-types (2.99.3)
-    mini_portile2 (2.2.0)
+    mime-types (3.2.2)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2018.0812)
+    mini_portile2 (2.3.0)
     mustache (0.99.8)
-    nokogiri (1.8.0)
-      mini_portile2 (~> 2.2.0)
+    nokogiri (1.8.4)
+      mini_portile2 (~> 2.3.0)
     posix-spawn (0.3.13)
-    rack (1.6.8)
-    rack-protection (1.5.3)
+    rack (1.6.10)
+    rack-protection (1.5.5)
       rack
-    rouge (2.1.1)
+    rouge (2.2.1)
     sanitize (2.1.0)
       nokogiri (>= 1.4.4)
     sinatra (1.4.8)
       rack (~> 1.5)
       rack-protection (~> 1.4)
       tilt (>= 1.3, < 3)
-    stringex (2.7.1)
+    stringex (2.8.4)
     tilt (2.0.8)
-    useragent (0.16.8)
+    twitter-text (1.14.7)
+      unf (~> 0.1.0)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.7.5)
+    useragent (0.16.10)
 
 PLATFORMS
   ruby
@@ -57,4 +65,4 @@ DEPENDENCIES
   gollum
 
 BUNDLED WITH
-   1.15.3
+   1.16.3
diff --git a/pkgs/applications/misc/gollum/default.nix b/pkgs/applications/misc/gollum/default.nix
index 4ad32c5fd7f5..4a0a4e38a61b 100644
--- a/pkgs/applications/misc/gollum/default.nix
+++ b/pkgs/applications/misc/gollum/default.nix
@@ -4,6 +4,7 @@
 stdenv.mkDerivation rec {
   name = "${pname}-${version}";
   pname = "gollum";
+  # nix-shell -p bundix icu zlib
   version = (import ./gemset.nix).gollum.version;
 
   nativeBuildInputs = [ makeWrapper ];
diff --git a/pkgs/applications/misc/gollum/gemset.nix b/pkgs/applications/misc/gollum/gemset.nix
index cff774d7daa0..1b3cda168ac2 100644
--- a/pkgs/applications/misc/gollum/gemset.nix
+++ b/pkgs/applications/misc/gollum/gemset.nix
@@ -2,10 +2,10 @@
   charlock_holmes = {
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0jsl6k27wjmssxbwv9wpf7hgp9r0nvizcf6qpjnr7qs2nia53lf7";
+      sha256 = "1nf1l31n10yaark2rrg5qzyzcx9w80681449s3j09qmnipsl8rl5";
       type = "gem";
     };
-    version = "0.7.3";
+    version = "0.7.6";
   };
   diff-lcs = {
     source = {
@@ -27,28 +27,28 @@
   github-markup = {
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1nyb9ck2c9z5qi86n7r52w0m126qpnvc93yh35cn8bwsnkjqx0iq";
+      sha256 = "17g6g18gdjg63k75sfwiskjzl9i0hfcnrkcpb4fwrnb20v3jgswp";
       type = "gem";
     };
-    version = "1.6.1";
+    version = "1.7.0";
   };
   gitlab-grit = {
     dependencies = ["charlock_holmes" "diff-lcs" "mime-types" "posix-spawn"];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0lf1cr6pzqrbnxiiwym6q74b1a2ihdi91dynajk8hi1p093hl66n";
+      sha256 = "0xgs3l81ghlc5nm75n0pz7b2cj3hpscfq5iy27c483nnjn2v5mc4";
       type = "gem";
     };
-    version = "2.8.1";
+    version = "2.8.2";
   };
   gollum = {
     dependencies = ["gemojione" "gollum-lib" "kramdown" "mustache" "sinatra" "useragent"];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "051pm2f50daiqcqy87aq4809x4c95iwwml6ca4wgvvmj5zkk6k5a";
+      sha256 = "1146irmnm0xyzjzw8k14wvb6h4cqh4q53ds92wk6jpsfs6r1pjq6";
       type = "gem";
     };
-    version = "4.1.2";
+    version = "4.1.3";
   };
   gollum-grit_adapter = {
     dependencies = ["gitlab-grit"];
@@ -60,13 +60,13 @@
     version = "1.0.1";
   };
   gollum-lib = {
-    dependencies = ["gemojione" "github-markup" "gollum-grit_adapter" "nokogiri" "rouge" "sanitize" "stringex"];
+    dependencies = ["gemojione" "github-markup" "gollum-grit_adapter" "nokogiri" "rouge" "sanitize" "stringex" "twitter-text"];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1filwvjfj5q2m6w4q274ai36d6f0mrsv2l2khhk4bv1q6pqby2fq";
+      sha256 = "1w48mrjgy4ykd1ix421n96nx0w15iid2aj3sgglpl3bdkizxhfqj";
       type = "gem";
     };
-    version = "4.2.7";
+    version = "4.2.9";
   };
   json = {
     source = {
@@ -85,20 +85,29 @@
     version = "1.9.0";
   };
   mime-types = {
+    dependencies = ["mime-types-data"];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "03j98xr0qw2p2jkclpmk7pm29yvmmh0073d8d43ajmr0h3w7i5l9";
+      sha256 = "0fjxy1jm52ixpnv3vg9ld9pr9f35gy0jp66i1njhqjvmnvq0iwwk";
       type = "gem";
     };
-    version = "2.99.3";
+    version = "3.2.2";
+  };
+  mime-types-data = {
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "07wvp0aw2gjm4njibb70as6rh5hi1zzri5vky1q6jx95h8l56idc";
+      type = "gem";
+    };
+    version = "3.2018.0812";
   };
   mini_portile2 = {
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0g5bpgy08q0nc0anisg3yvwc1gc3inl854fcrg48wvg7glqd6dpm";
+      sha256 = "13d32jjadpjj6d2wdhkfpsmy68zjx90p49bgf8f7nkpz86r1fr11";
       type = "gem";
     };
-    version = "2.2.0";
+    version = "2.3.0";
   };
   mustache = {
     source = {
@@ -112,10 +121,10 @@
     dependencies = ["mini_portile2"];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1nffsyx1xjg6v5n9rrbi8y1arrcx2i5f21cp6clgh9iwiqkr7rnn";
+      sha256 = "1h9nml9h3m0mpvmh8jfnqvblnz5n5y3mmhgfc38avfmfzdrq9bgc";
       type = "gem";
     };
-    version = "1.8.0";
+    version = "1.8.4";
   };
   posix-spawn = {
     source = {
@@ -128,27 +137,27 @@
   rack = {
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "19m7aixb2ri7p1n0iqaqx8ldi97xdhvbxijbyrrcdcl6fv5prqza";
+      sha256 = "0in0amn0kwvzmi8h5zg6ijrx5wpsf8h96zrfmnk1kwh2ql4sxs2q";
       type = "gem";
     };
-    version = "1.6.8";
+    version = "1.6.10";
   };
   rack-protection = {
     dependencies = ["rack"];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0cvb21zz7p9wy23wdav63z5qzfn4nialik22yqp6gihkgfqqrh5r";
+      sha256 = "0my0wlw4a5l3hs79jkx2xzv7djhajgf8d28k8ai1ddlnxxb0v7ss";
       type = "gem";
     };
-    version = "1.5.3";
+    version = "1.5.5";
   };
   rouge = {
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1wn6rq5qjmcwh9ixkljazv6gmg746rgbgs6av5qnk0mxim5qw11p";
+      sha256 = "02kpahk5nkc33yxnn75649kzxaz073wvazr2zyg491nndykgnvcs";
       type = "gem";
     };
-    version = "2.1.1";
+    version = "2.2.1";
   };
   sanitize = {
     dependencies = ["nokogiri"];
@@ -171,10 +180,10 @@
   stringex = {
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1zc93v00av643lc6njl09wwki7h5yqayhh1din8zqfylw814l1dv";
+      sha256 = "0c5dfrjzkskzfsdvwsviq4111rwwpbk9022nxwdidz014mky5vi1";
       type = "gem";
     };
-    version = "2.7.1";
+    version = "2.8.4";
   };
   tilt = {
     source = {
@@ -184,12 +193,38 @@
     };
     version = "2.0.8";
   };
+  twitter-text = {
+    dependencies = ["unf"];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1732h7hy1k152w8wfvjsx7b79alk45i5imwd37ia4qcx8hfm3gvg";
+      type = "gem";
+    };
+    version = "1.14.7";
+  };
+  unf = {
+    dependencies = ["unf_ext"];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0bh2cf73i2ffh4fcpdn9ir4mhq8zi50ik0zqa1braahzadx536a9";
+      type = "gem";
+    };
+    version = "0.1.4";
+  };
+  unf_ext = {
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "06p1i6qhy34bpb8q8ms88y6f2kz86azwm098yvcc0nyqk9y729j1";
+      type = "gem";
+    };
+    version = "0.0.7.5";
+  };
   useragent = {
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1139cjqyv1hk1qcw89k81ajjkqyakqgbcyvmfrsmjqi8yn9kgqhq";
+      sha256 = "1fv5kvq494swy0p17h9qya9r50w15xsi9zmvhzb8gh55kq6ki50p";
       type = "gem";
     };
-    version = "0.16.8";
+    version = "0.16.10";
   };
 }
\ No newline at end of file