diff --git a/pkgs/development/tools/build-managers/bear/default.nix b/pkgs/development/tools/build-managers/bear/default.nix
index 489181187c4e..6595c143084f 100644
--- a/pkgs/development/tools/build-managers/bear/default.nix
+++ b/pkgs/development/tools/build-managers/bear/default.nix
@@ -6,7 +6,7 @@
   ninja,
   pkg-config,
   grpc,
-  protobuf_25,
+  protobuf,
   openssl,
   nlohmann_json,
   gtest,
@@ -22,13 +22,13 @@
 
 stdenv.mkDerivation rec {
   pname = "bear";
-  version = "3.1.3";
+  version = "3.1.5";
 
   src = fetchFromGitHub {
     owner = "rizsotto";
     repo = pname;
     rev = version;
-    hash = "sha256-1nZPzgLWcmaRkOUXdm16IW2Nw/p1w8GBGEfZX/v+En0=";
+    hash = "sha256-pwdjytP+kmTwozRl1Gd0jUqRs3wfvcYPqiQvVwa6s9c=";
   };
 
   nativeBuildInputs = [
@@ -43,7 +43,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     grpc
-    protobuf_25
+    protobuf
     openssl
     nlohmann_json
     gtest
@@ -63,11 +63,6 @@ stdenv.mkDerivation rec {
     (lib.cmakeBool "ENABLE_FUNC_TESTS" false)
   ];
 
-  patches = [
-    # Fix toolchain environment variable handling and the Darwin SIP check.
-    ./fix-functional-tests.patch
-  ];
-
   postPatch = ''
     patchShebangs test/bin
 
diff --git a/pkgs/development/tools/build-managers/bear/fix-functional-tests.patch b/pkgs/development/tools/build-managers/bear/fix-functional-tests.patch
deleted file mode 100644
index 99d64f26d077..000000000000
--- a/pkgs/development/tools/build-managers/bear/fix-functional-tests.patch
+++ /dev/null
@@ -1,32 +0,0 @@
-diff --git a/test/lit.cfg b/test/lit.cfg
-index 118c979..b69fecc 100644
---- a/test/lit.cfg
-+++ b/test/lit.cfg
-@@ -207,13 +207,8 @@ def is_preload_disabled():
-     if is_windows:
-         return True
-     elif sys.platform == 'darwin':
--        command = ['csrutil', 'status']
--        pattern = re.compile(r'System Integrity Protection status:\s+enabled')
--        try:
--            output = subprocess.check_output(command, stderr=subprocess.STDOUT)
--            return any(pattern.match(line) for line in output.decode('utf-8').splitlines())
--        except (OSError, subprocess.CalledProcessError):
--            return False
-+        # csrutil(8) isn't available in the Nix build sandbox.
-+        return True
-     else:
-         return False
- 
-@@ -221,6 +216,11 @@ def is_preload_disabled():
- if not is_preload_disabled():
-     config.available_features.add('preload')
- 
-+# Preserve the variables required for the Nix toolchain wrappers.
-+for var, value in os.environ.items():
-+    if var.startswith('NIX_'):
-+        config.environment[var] = value
-+
- print(config.substitutions)
- print(config.environment)
- print(config.available_features)