diff --git a/analytics/integration_test/googletest.cmake b/analytics/integration_test/googletest.cmake
index 8b0069a034..bd28844e09 100644
--- a/analytics/integration_test/googletest.cmake
+++ b/analytics/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/app/integration_test/googletest.cmake b/app/integration_test/googletest.cmake
index 8b0069a034..bd28844e09 100644
--- a/app/integration_test/googletest.cmake
+++ b/app/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/app_check/integration_test/googletest.cmake b/app_check/integration_test/googletest.cmake
index 63d25825dd..a88bd3775e 100644
--- a/app_check/integration_test/googletest.cmake
+++ b/app_check/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/auth/integration_test/googletest.cmake b/auth/integration_test/googletest.cmake
index 8b0069a034..bd28844e09 100644
--- a/auth/integration_test/googletest.cmake
+++ b/auth/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/cmake/external/googletest.cmake b/cmake/external/googletest.cmake
index 329befefe5..db7ed2c3f3 100644
--- a/cmake/external/googletest.cmake
+++ b/cmake/external/googletest.cmake
@@ -18,15 +18,16 @@ if(TARGET googletest OR NOT DOWNLOAD_GOOGLETEST)
   return()
 endif()
 
-set(version 1.11.0) # June 2021
+# Pin to the v1.18.0 commit hash (August 2026) to ensure the tag does not change.
+set(version 063de7e9578f82b369302001269680b4b1553359)
 
 ExternalProject_Add(
   googletest
 
   DOWNLOAD_DIR ${FIREBASE_DOWNLOAD_DIR}
   DOWNLOAD_NAME googletest-${version}.tar.gz
-  URL https://github.com/google/googletest/archive/release-${version}.tar.gz
-  URL_HASH SHA256=b4870bf121ff7795ba20d20bcdd8627b8e088f2d1dab299a031c1034eddc93d5
+  URL https://github.com/google/googletest/archive/${version}.tar.gz
+  URL_HASH SHA256=623fe05d283020f37a579a8985ba338091ac7229da62b5591ff40acdf05b95e2
 
   PREFIX ${PROJECT_BINARY_DIR}
 
diff --git a/database/integration_test/googletest.cmake b/database/integration_test/googletest.cmake
index 8b0069a034..bd28844e09 100644
--- a/database/integration_test/googletest.cmake
+++ b/database/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/firestore/integration_test/googletest.cmake b/firestore/integration_test/googletest.cmake
index 8b0069a034..bd28844e09 100644
--- a/firestore/integration_test/googletest.cmake
+++ b/firestore/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/firestore/integration_test_internal/googletest.cmake b/firestore/integration_test_internal/googletest.cmake
index 8b0069a034..bd28844e09 100644
--- a/firestore/integration_test_internal/googletest.cmake
+++ b/firestore/integration_test_internal/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/functions/integration_test/googletest.cmake b/functions/integration_test/googletest.cmake
index 8b0069a034..bd28844e09 100644
--- a/functions/integration_test/googletest.cmake
+++ b/functions/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/installations/integration_test/googletest.cmake b/installations/integration_test/googletest.cmake
index 8b0069a034..bd28844e09 100644
--- a/installations/integration_test/googletest.cmake
+++ b/installations/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/messaging/integration_test/googletest.cmake b/messaging/integration_test/googletest.cmake
index 8b0069a034..bd28844e09 100644
--- a/messaging/integration_test/googletest.cmake
+++ b/messaging/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/remote_config/integration_test/googletest.cmake b/remote_config/integration_test/googletest.cmake
index 8b0069a034..bd28844e09 100644
--- a/remote_config/integration_test/googletest.cmake
+++ b/remote_config/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/storage/integration_test/googletest.cmake b/storage/integration_test/googletest.cmake
index 8b0069a034..bd28844e09 100644
--- a/storage/integration_test/googletest.cmake
+++ b/storage/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""
diff --git a/testing/test_framework/download_googletest.py b/testing/test_framework/download_googletest.py
index 21515bc06f..931a322b54 100755
--- a/testing/test_framework/download_googletest.py
+++ b/testing/test_framework/download_googletest.py
@@ -35,10 +35,13 @@
 SRC_DIR = os.path.relpath(os.path.dirname(__file__))
 TAG = os.path.basename(__file__)
 
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
-GOOGLETEST_ZIP = 'https://github.com/google/googletest/archive/refs/tags/release-1.11.0.zip'
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
+GOOGLETEST_COMMIT = '063de7e9578f82b369302001269680b4b1553359'
+GOOGLETEST_ZIP = (
+    'https://github.com/google/googletest/archive/%s.zip' % GOOGLETEST_COMMIT
+)
 # Top-level directory inside the zip file to ignore.
-GOOGLETEST_DIR = os.path.join('googletest-release-1.11.0')
+GOOGLETEST_DIR = 'googletest-%s' % GOOGLETEST_COMMIT
 
 # The GoogleTest code is copied into this subdirectory.
 # This structure matches where the files are placed by CMake.
diff --git a/ump/integration_test/googletest.cmake b/ump/integration_test/googletest.cmake
index 91fc42cc10..29c279388a 100644
--- a/ump/integration_test/googletest.cmake
+++ b/ump/integration_test/googletest.cmake
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # Download GoogleTest from GitHub as an external project.
-# Pin to 1.11.0 because we touch internal GoogleTest structures that could change in the future.
+# Pin to the v1.18.0 commit hash to ensure the tag does not change.
 
 # This CMake file is taken from:
 # https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project
@@ -25,7 +25,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           "release-1.11.0"
+  GIT_TAG           "063de7e9578f82b369302001269680b4b1553359"
   SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/src"
   BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/build"
   CONFIGURE_COMMAND ""