diff --git a/pkgs/applications/editors/jupyter-kernels/clojupyter/default.nix b/pkgs/applications/editors/jupyter-kernels/clojupyter/default.nix
index ee081737e355..af56ba9147eb 100644
--- a/pkgs/applications/editors/jupyter-kernels/clojupyter/default.nix
+++ b/pkgs/applications/editors/jupyter-kernels/clojupyter/default.nix
@@ -13,7 +13,7 @@
 # nix run --impure --expr 'with import <nixpkgs> {}; jupyter-console.withSingleKernel clojupyter.definition'
 
 # Jupyter notebook:
-# nix run --impure --expr 'with import <nixpkgs> {}; jupyter.override { definitions.clojure = clojupyter.definition; }'
+# nix shell --impure --expr 'with import <nixpkgs> {}; [ (jupyter.override { definitions.clojure = clojupyter.definition; }) ]' -c jupyter-notebook
 
 let
   cljdeps = import ./deps.nix { inherit pkgs; };
diff --git a/pkgs/applications/editors/jupyter-kernels/octave/default.nix b/pkgs/applications/editors/jupyter-kernels/octave/default.nix
index 74ea3d9b60f5..f4b9202b8109 100644
--- a/pkgs/applications/editors/jupyter-kernels/octave/default.nix
+++ b/pkgs/applications/editors/jupyter-kernels/octave/default.nix
@@ -12,7 +12,7 @@
 # nix run --impure --expr 'with import <nixpkgs> {}; jupyter-console.withSingleKernel octave-kernel.definition'
 
 # Jupyter notebook:
-# nix run --impure --expr 'with import <nixpkgs> {}; jupyter.override { definitions.octave = octave-kernel.definition; }'
+# nix shell --impure --expr 'with import <nixpkgs> {}; [ (jupyter.override { definitions.octave = octave-kernel.definition; }) ]' -c jupyter-notebook
 
 let
   kernel = callPackage ./kernel.nix {
diff --git a/pkgs/applications/editors/jupyter-kernels/wolfram/default.nix b/pkgs/applications/editors/jupyter-kernels/wolfram/default.nix
index 92ffdcb38e8a..89efbb9d041e 100644
--- a/pkgs/applications/editors/jupyter-kernels/wolfram/default.nix
+++ b/pkgs/applications/editors/jupyter-kernels/wolfram/default.nix
@@ -7,7 +7,7 @@
 # nix run --impure --expr 'with import <nixpkgs> {}; jupyter-console.withSingleKernel wolfram-for-jupyter-kernel.definition'
 
 # Jupyter notebook:
-# nix run --impure --expr 'with import <nixpkgs> {}; jupyter.override { definitions.wolfram = wolfram-for-jupyter-kernel.definition; }'
+# nix shell --impure --expr 'with import <nixpkgs> {}; [ (jupyter.override { definitions.wolfram = wolfram-for-jupyter-kernel.definition; }) ]' -c jupyter-notebook
 
 let
   kernel = callPackage ./kernel.nix { };
diff --git a/pkgs/by-name/ir/iruby/Gemfile b/pkgs/by-name/ir/iruby/Gemfile
index 3998b5c6e99a..4a466e235bbb 100644
--- a/pkgs/by-name/ir/iruby/Gemfile
+++ b/pkgs/by-name/ir/iruby/Gemfile
@@ -1,2 +1,2 @@
 source 'https://rubygems.org'
-gem 'iruby', "0.8.2"
+gem 'iruby', "0.8.3"
diff --git a/pkgs/by-name/ir/iruby/Gemfile.lock b/pkgs/by-name/ir/iruby/Gemfile.lock
index 972a50ba6bf4..4c8a24f9b13d 100644
--- a/pkgs/by-name/ir/iruby/Gemfile.lock
+++ b/pkgs/by-name/ir/iruby/Gemfile.lock
@@ -1,35 +1,54 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    cgi (0.5.2)
     data_uri (0.1.0)
-    ffi (1.15.5)
+    date (3.5.1)
+    erb (4.0.4.1)
+      cgi (>= 0.3.3)
+    ffi (1.17.4)
     ffi-rzmq (2.0.7)
       ffi-rzmq-core (>= 1.0.7)
     ffi-rzmq-core (1.0.7)
       ffi
-    io-console (0.6.0)
-    irb (1.7.4)
-      reline (>= 0.3.6)
-    iruby (0.8.2)
+    io-console (0.8.2)
+    irb (1.18.0)
+      pp (>= 0.6.0)
+      prism (>= 1.3.0)
+      rdoc (>= 4.0.0)
+      reline (>= 0.4.2)
+    iruby (0.8.3)
       data_uri (~> 0.1)
       ffi-rzmq
       irb
       logger
       mime-types (>= 3.3.1)
-      multi_json (~> 1.11)
     logger (1.7.0)
-    mime-types (3.5.1)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2023.0808)
-    multi_json (1.15.0)
-    reline (0.3.8)
+    mime-types (3.7.0)
+      logger
+      mime-types-data (~> 3.2025, >= 3.2025.0507)
+    mime-types-data (3.2026.0414)
+    pp (0.6.4)
+      prettyprint
+    prettyprint (0.2.0)
+    prism (1.9.0)
+    psych (5.4.0)
+      date
+      stringio
+    rdoc (7.2.0)
+      erb
+      psych (>= 4.0.0)
+      tsort
+    reline (0.6.3)
       io-console (~> 0.5)
+    stringio (3.2.0)
+    tsort (0.2.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  iruby (= 0.8.2)
+  iruby (= 0.8.3)
 
 BUNDLED WITH
-   2.6.9
+   2.3.9
diff --git a/pkgs/by-name/ir/iruby/gemset.nix b/pkgs/by-name/ir/iruby/gemset.nix
index 0b875d6e8a6f..6bc68cee3f16 100644
--- a/pkgs/by-name/ir/iruby/gemset.nix
+++ b/pkgs/by-name/ir/iruby/gemset.nix
@@ -1,4 +1,14 @@
 {
+  cgi = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "1fzqwshg1xzbdm97havskfp6wifsgbjii00dzba0y6bih4lk1jk1";
+      type = "gem";
+    };
+    version = "0.5.2";
+  };
   data_uri = {
     groups = [ "default" ];
     platforms = [ ];
@@ -9,15 +19,36 @@
     };
     version = "0.1.0";
   };
+  date = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "1h0db8r2v5llxdbzkzyllkfniqw9gm092qn7cbaib73v9lw0c3bm";
+      type = "gem";
+    };
+    version = "3.5.1";
+  };
+  erb = {
+    dependencies = [ "cgi" ];
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "097f4xvjq5k0m0i9mjwpl8vmqrl1wpbllc624f6fqk5s484sgqj7";
+      type = "gem";
+    };
+    version = "4.0.4.1";
+  };
   ffi = {
     groups = [ "default" ];
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "1862ydmclzy1a0cjbvm8dz7847d9rch495ib0zb64y84d3xd4bkg";
+      sha256 = "1kqasqvy8d7r09ri4n6bkdwbk63j7afd9ilsw34nzlgh0qp69ldw";
       type = "gem";
     };
-    version = "1.15.5";
+    version = "1.17.4";
   };
   ffi-rzmq = {
     dependencies = [ "ffi-rzmq-core" ];
@@ -46,21 +77,26 @@
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "0dikardh14c72gd9ypwh8dim41wvqmzfzf35mincaj5yals9m7ff";
+      sha256 = "1k0lk3pwadm2myvpg893n8jshmrf2sigrd4ki15lymy7gixaxqyn";
       type = "gem";
     };
-    version = "0.6.0";
+    version = "0.8.2";
   };
   irb = {
-    dependencies = [ "reline" ];
+    dependencies = [
+      "pp"
+      "prism"
+      "rdoc"
+      "reline"
+    ];
     groups = [ "default" ];
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "158ca10kj3qqnql5g8f1g2arsnhgdl79mg74manpf8ldkwjjn3n8";
+      sha256 = "1qs8a9vprg7s8krgq4s0pygr91hclqqyz98ik15p0m1sf2h5956y";
       type = "gem";
     };
-    version = "1.7.4";
+    version = "1.18.0";
   };
   iruby = {
     dependencies = [
@@ -69,16 +105,15 @@
       "irb"
       "logger"
       "mime-types"
-      "multi_json"
     ];
     groups = [ "default" ];
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "11lb7flkqpaff303g6lj9vzdw9zc0s2qmz36a6i4x4qj559bz30n";
+      sha256 = "13qdw2ykzn6yjs4biiyvy1dr5j5v3kb1q7r98ds0kvg22rbs1s56";
       type = "gem";
     };
-    version = "0.8.2";
+    version = "0.8.3";
   };
   logger = {
     groups = [ "default" ];
@@ -91,35 +126,88 @@
     version = "1.7.0";
   };
   mime-types = {
-    dependencies = [ "mime-types-data" ];
+    dependencies = [
+      "logger"
+      "mime-types-data"
+    ];
     groups = [ "default" ];
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "0q8d881k1b3rbsfcdi3fx0b5vpdr5wcrhn88r2d9j7zjdkxp5mw5";
+      sha256 = "0mjyxl7c0xzyqdqa8r45hqg7jcw2prp3hkp39mdf223g4hfgdsyw";
       type = "gem";
     };
-    version = "3.5.1";
+    version = "3.7.0";
   };
   mime-types-data = {
     groups = [ "default" ];
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "17zdim7kzrh5j8c97vjqp4xp78wbyz7smdp4hi5iyzk0s9imdn5a";
+      sha256 = "1k28j6ww8rf43r5i8278jvm2cq3pnzsvqm7yqpb4p93kadjlq726";
       type = "gem";
     };
-    version = "3.2023.0808";
+    version = "3.2026.0414";
   };
-  multi_json = {
+  pp = {
+    dependencies = [ "prettyprint" ];
     groups = [ "default" ];
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "0pb1g1y3dsiahavspyzkdy39j4q377009f6ix0bh1ag4nqw43l0z";
+      sha256 = "0w5mha75hs8gdj75g8vl0sxpyp8rzvwq8a4jcmi4ah8cf370zjyz";
       type = "gem";
     };
-    version = "1.15.0";
+    version = "0.6.4";
+  };
+  prettyprint = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "14zicq3plqi217w6xahv7b8f7aj5kpxv1j1w98344ix9h5ay3j9b";
+      type = "gem";
+    };
+    version = "0.2.0";
+  };
+  prism = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "11ggfikcs1lv17nhmhqyyp6z8nq5pkfcj6a904047hljkxm0qlvv";
+      type = "gem";
+    };
+    version = "1.9.0";
+  };
+  psych = {
+    dependencies = [
+      "date"
+      "stringio"
+    ];
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "1dx5bc3s1mb1i53np4cdkypg7ccygnvagr3hglyndbqilrljvxql";
+      type = "gem";
+    };
+    version = "5.4.0";
+  };
+  rdoc = {
+    dependencies = [
+      "erb"
+      "psych"
+      "tsort"
+    ];
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "14iiyb4yi1chdzrynrk74xbhmikml3ixgdayjma3p700singfl46";
+      type = "gem";
+    };
+    version = "7.2.0";
   };
   reline = {
     dependencies = [ "io-console" ];
@@ -127,9 +215,29 @@
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "0lv1nv7z63n4qmsm3h5h273m7daxngkcq8ynkk9j8lmn7jji98lb";
+      sha256 = "0d8q5c4nh2g9pp758kizh8sfrvngynrjlm0i1zn3cnsnfd4v160i";
       type = "gem";
     };
-    version = "0.3.8";
+    version = "0.6.3";
+  };
+  stringio = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "1q92y9627yisykyscv0bdsrrgyaajc2qr56dwlzx7ysgigjv4z63";
+      type = "gem";
+    };
+    version = "3.2.0";
+  };
+  tsort = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "17q8h020dw73wjmql50lqw5ddsngg67jfw8ncjv476l5ys9sfl4n";
+      type = "gem";
+    };
+    version = "0.2.0";
   };
 }
diff --git a/pkgs/by-name/ir/iruby/package.nix b/pkgs/by-name/ir/iruby/package.nix
index 9054540ab378..b69da51d9eb8 100644
--- a/pkgs/by-name/ir/iruby/package.nix
+++ b/pkgs/by-name/ir/iruby/package.nix
@@ -7,7 +7,7 @@
 # nix run --impure --expr 'with import <nixpkgs> {}; jupyter-console.withSingleKernel iruby.definition'
 
 # Jupyter notebook:
-# nix run --impure --expr 'with import <nixpkgs> {}; jupyter.override { definitions.iruby = iruby.definition; }'
+# nix shell --impure --expr 'with import <nixpkgs> {}; [ (jupyter.override { definitions.iruby = iruby.definition; }) ]' -c jupyter-notebook
 
 let
   self = bundlerApp {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 06ef7f62abba..5167f82fc671 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2321,6 +2321,7 @@ with pkgs;
       clojure = clojupyter.definition;
       octave = octave-kernel.definition;
       r = r-ark-kernel.definition;
+      ruby = iruby.definition;
       # wolfram = wolfram-for-jupyter-kernel.definition; # unfree
     };
   };