diff --git a/pkgs/build-support/build-mozilla-mach/default.nix b/pkgs/build-support/build-mozilla-mach/default.nix
index b578050bf8c9..e484f6b0bde2 100644
--- a/pkgs/build-support/build-mozilla-mach/default.nix
+++ b/pkgs/build-support/build-mozilla-mach/default.nix
@@ -89,7 +89,6 @@ in
   nasm,
   nspr,
   nss_esr,
-  nss_3_115,
   nss_latest,
   onnxruntime,
   pango,
@@ -572,14 +571,7 @@ buildStdenv.mkDerivation {
       xorg.pixman
       xorg.xorgproto
       zlib
-      (
-        if (lib.versionAtLeast version "144") then
-          nss_latest
-        else if (lib.versionAtLeast version "143") then
-          nss_3_115
-        else
-          nss_esr
-      )
+      (if (lib.versionAtLeast version "144") then nss_latest else nss_esr)
     ]
     ++ lib.optional alsaSupport alsa-lib
     ++ lib.optional jackSupport libjack2
diff --git a/pkgs/development/libraries/nss/3_115.nix b/pkgs/development/libraries/nss/3_115.nix
deleted file mode 100644
index 7436aee6c513..000000000000
--- a/pkgs/development/libraries/nss/3_115.nix
+++ /dev/null
@@ -1,6 +0,0 @@
-import ./generic.nix {
-  version = "3.115.1";
-  hash = "sha256-SuXNqRW0lBPioYxmoGa3ZbfxC7ud6TW3xVpakVwtm14=";
-  filename = "3_115.nix";
-  versionRegex = "NSS_(3)_(115)(?:_(\\d+))?_RTM";
-}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 486b519307ce..faeb0c86d7f3 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -8227,7 +8227,6 @@ with pkgs;
   };
 
   nss_latest = callPackage ../development/libraries/nss/latest.nix { };
-  nss_3_115 = callPackage ../development/libraries/nss/3_115.nix { };
   nss_esr = callPackage ../development/libraries/nss/esr.nix { };
   nss = nss_esr;
   nssTools = nss.tools;