diff --git a/pkgs/development/interpreters/ruby/default.nix b/pkgs/development/interpreters/ruby/default.nix
index f90ac84a4ba1..29c6b568d00d 100644
--- a/pkgs/development/interpreters/ruby/default.nix
+++ b/pkgs/development/interpreters/ruby/default.nix
@@ -57,13 +57,9 @@ let
     }:
     let
       ver = version;
-      atLeast32 = lib.versionAtLeast ver.majMin "3.2";
       # https://github.com/ruby/ruby/blob/v3_2_2/yjit.h#L21
       yjitSupported =
-        atLeast32
-        && (
-          stdenv.hostPlatform.isx86_64 || (!stdenv.hostPlatform.isWindows && stdenv.hostPlatform.isAarch64)
-        );
+        stdenv.hostPlatform.isx86_64 || (!stdenv.hostPlatform.isWindows && stdenv.hostPlatform.isAarch64);
       rubyDrv = lib.makeOverridable (
         {
           stdenv,
@@ -187,17 +183,13 @@ let
           # make: *** [uncommon.mk:373: do-install-all] Error 1
           enableParallelInstalling = false;
 
-          patches =
-            op useBaseRuby (
-              if atLeast32 then ./do-not-update-gems-baseruby-3.2.patch else ./do-not-update-gems-baseruby.patch
-            )
-            ++ [
-              # When using a baseruby, ruby always sets "libdir" to the build
-              # directory, which nix rejects due to a reference in to /build/ in
-              # the final product. Removing this reference doesn't seem to break
-              # anything and fixes cross compilation.
-              ./dont-refer-to-build-dir.patch
-            ];
+          patches = op useBaseRuby ./do-not-update-gems-baseruby-3.2.patch ++ [
+            # When using a baseruby, ruby always sets "libdir" to the build
+            # directory, which nix rejects due to a reference in to /build/ in
+            # the final product. Removing this reference doesn't seem to break
+            # anything and fixes cross compilation.
+            ./dont-refer-to-build-dir.patch
+          ];
 
           cargoRoot = opString yjitSupport "yjit";
 
@@ -401,11 +393,6 @@ in
   mkRubyVersion = rubyVersion;
   mkRuby = generic;
 
-  ruby_3_1 = generic {
-    version = rubyVersion "3" "1" "7" "";
-    hash = "sha256-BVas1p8UHdrOA/pd2NdufqDY9SMu3wEkKVebzaqzDns=";
-  };
-
   ruby_3_2 = generic {
     version = rubyVersion "3" "2" "9" "";
     hash = "sha256-q7rZjbmusVJ3Ow01ho5QADuMRn89BhUld8Tf7Z2I7So=";
diff --git a/pkgs/development/interpreters/ruby/do-not-update-gems-baseruby.patch b/pkgs/development/interpreters/ruby/do-not-update-gems-baseruby.patch
deleted file mode 100644
index 2de1977630cb..000000000000
--- a/pkgs/development/interpreters/ruby/do-not-update-gems-baseruby.patch
+++ /dev/null
@@ -1,14 +0,0 @@
-Do not update gems when building with base ruby
-
-diff -Naur ruby.old/defs/gmake.mk ruby.new/defs/gmake.mk
---- ruby.old/common.mk
-+++ ruby.new/common.mk
-@@ -1298,7 +1298,7 @@ update-config_files: PHONY
- 	    config.guess config.sub
- 
- refresh-gems: update-bundled_gems prepare-gems
--prepare-gems: $(HAVE_BASERUBY:yes=update-gems) $(HAVE_BASERUBY:yes=extract-gems)
-+prepare-gems:
- 
- update-gems$(gnumake:yes=-nongnumake): PHONY
- 	$(ECHO) Downloading bundled gem files...
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index bead703c539d..5f4bae8cc4ba 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -2354,6 +2354,8 @@ mapAliases {
   rquickshare-legacy = throw "The legacy version depends on insecure package libsoup2, please use the main version"; # Added 2025-10-09
   rr-unstable = rr; # Added 2022-09-17
   rtx = mise; # Added 2024-01-05
+  ruby_3_1 = throw "ruby_3_1 has been removed, as it is has reached end‐of‐life upstream"; # Added 2025-10-12
+  rubyPackages_3_1 = throw "rubyPackages_3_1 has been removed, as it is has reached end‐of‐life upstream"; # Added 2025-10-12
   ruby-zoom = throw "'ruby-zoom' has been removed due to lack of maintaince and had not been updated since 2020"; # Added 2025-08-24
   runCommandNoCC = runCommand; # Added 2021-08-15
   runCommandNoCCLocal = runCommandLocal; # Added 2021-08-15
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e15fcd45ccc0..b09b913e2cb9 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6036,7 +6036,6 @@ with pkgs;
     })
     mkRubyVersion
     mkRuby
-    ruby_3_1
     ruby_3_2
     ruby_3_3
     ruby_3_4
@@ -6046,7 +6045,6 @@ with pkgs;
   ruby = ruby_3_3;
   rubyPackages = rubyPackages_3_3;
 
-  rubyPackages_3_1 = recurseIntoAttrs ruby_3_1.gems;
   rubyPackages_3_2 = recurseIntoAttrs ruby_3_2.gems;
   rubyPackages_3_3 = recurseIntoAttrs ruby_3_3.gems;
   rubyPackages_3_4 = recurseIntoAttrs ruby_3_4.gems;
diff --git a/pkgs/top-level/pkg-config/pkg-config-data.json b/pkgs/top-level/pkg-config/pkg-config-data.json
index b8db6efa5aa5..a7a118056d37 100644
--- a/pkgs/top-level/pkg-config/pkg-config-data.json
+++ b/pkgs/top-level/pkg-config/pkg-config-data.json
@@ -746,11 +746,6 @@
         "python3"
       ]
     },
-    "ruby-3.1": {
-      "attrPath": [
-        "ruby_3_1"
-      ]
-    },
     "sdl2": {
       "attrPath": [
         "SDL2"