diff --git a/BUILD b/BUILD
index 2d0a5f0..5e04e03 100644
--- a/BUILD
+++ b/BUILD
@@ -164,14 +164,13 @@
     # trigger incorrectly on parts of rotation_test. For now, disable them,
     # but in the future disable these warnings only for rotation_test.
     # TODO(keir): When the tests are macro-ified, apply these selectively.
-    "-Wno-nonnull-compare",
     "-Wno-address",
 ]
 
 TEST_DEPS = [
     "//:ceres",
     "//:test_util",
-    "@com_github_eigen_eigen//:eigen",
+    "@com_gitlab_libeigen_eigen//:eigen",
     "@com_github_gflags_gflags//:gflags",
 ]
 
@@ -210,7 +209,6 @@
     copts = TEST_COPTS,
     deps = TEST_DEPS + ["@com_github_google_benchmark//:benchmark"],
 ) for benchmark_name in [
-    "autodiff_cost_function_benchmark",
     "small_blas_gemm_benchmark",
     "small_blas_gemv_benchmark",
 ]]
diff --git a/WORKSPACE b/WORKSPACE
index 7264bed..e1e5eca 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -57,11 +57,11 @@
 
 # External dependency: Eigen; has no Bazel build.
 http_archive(
-    name = "com_github_eigen_eigen",
-    sha256 = "dd254beb0bafc695d0f62ae1a222ff85b52dbaa3a16f76e781dce22d0d20a4a6",
-    strip_prefix = "eigen-eigen-5a0156e40feb",
+    name = "com_gitlab_libeigen_eigen",
+    sha256 = "0215c6593c4ee9f1f7f28238c4e8995584ebf3b556e9dbf933d84feb98d5b9ef",
+    strip_prefix = "eigen-3.3.8",
     urls = [
-        "http://bitbucket.org/eigen/eigen/get/3.3.4.tar.bz2",
+        "https://gitlab.com/libeigen/eigen/-/archive/3.3.8/eigen-3.3.8.tar.bz2",
     ],
     build_file_content =
 """
diff --git a/bazel/ceres.bzl b/bazel/ceres.bzl
index 9f12f1b..ce170b2 100644
--- a/bazel/ceres.bzl
+++ b/bazel/ceres.bzl
@@ -204,7 +204,7 @@
         ],
         visibility = ["//visibility:public"],
         deps = [
-            "@com_github_eigen_eigen//:eigen",
+            "@com_gitlab_libeigen_eigen//:eigen",
             "@com_github_google_glog//:glog",
         ],
     )