diff --git a/tensorflow/workspace.bzl b/tensorflow/workspace.bzl
index d869ac53582..d3a39390b23 100755
--- a/tensorflow/workspace.bzl
+++ b/tensorflow/workspace.bzl
@@ -685,8 +685,8 @@ def tf_repositories(path_prefix = "", tf_repo_name = ""):
     )
 
     # Check out LLVM and MLIR from llvm-project.
-    LLVM_COMMIT = "e996f1d4194bccf1c8ca984d695b848c0093bc23"
-    LLVM_SHA256 = "4bcb567a485791f4b49d39dc6901c7d179d592f5a427a22f05ea6b4c710103de"
+    LLVM_COMMIT = "71635ea5ffd62a7de91c759c0dfb7bb40c16fd94"
+    LLVM_SHA256 = "fcf303a228071a705f8185d66ecab4e0c4e82bdcaa4626919e302b3276b09bdd"
     LLVM_URLS = [
         "https://storage.googleapis.com/mirror.tensorflow.org/github.com/llvm/llvm-project/archive/{commit}.tar.gz".format(commit = LLVM_COMMIT),
         "https://github.com/llvm/llvm-project/archive/{commit}.tar.gz".format(commit = LLVM_COMMIT),
diff --git a/third_party/mlir/BUILD b/third_party/mlir/BUILD
index 257d2e8e4a7..706528b695c 100644
--- a/third_party/mlir/BUILD
+++ b/third_party/mlir/BUILD
@@ -87,8 +87,10 @@ gentbl(
         "include/mlir/IR/BuiltinOps.td",
         "include/mlir/IR/BuiltinDialect.td",
         "include/mlir/Interfaces/CallInterfaces.td",
+        "include/mlir/Interfaces/CastInterfaces.td",
         "include/mlir/IR/SymbolInterfaces.td",
         ":OpBaseTdFiles",
+        ":SideEffectTdFiles",
     ],
 )
 
@@ -124,6 +126,8 @@ cc_library(
         "include/mlir/IR/*.h",
     ]) + [
         "include/mlir/Interfaces/CallInterfaces.h",
+        "include/mlir/Interfaces/CastInterfaces.h",
+        "include/mlir/Interfaces/SideEffectInterfaces.h",
         "include/mlir/Interfaces/DecodeAttributesInterfaces.h",
         "include/mlir/Interfaces/FoldInterfaces.h",
     ],
@@ -133,6 +137,7 @@ cc_library(
         ":BuiltinOpsIncGen",
         ":BuiltinTypesIncGen",
         ":CallOpInterfacesIncGen",
+        ":CastOpInterfacesIncGen",
         ":InferTypeOpInterfaceIncGen",
         ":OpAsmInterfaceIncGen",
         ":RegionKindInterfaceIncGen",
@@ -1031,6 +1036,7 @@ filegroup(
         "include/mlir/IR/OpAsmInterface.td",
         "include/mlir/IR/SymbolInterfaces.td",
         "include/mlir/Interfaces/CallInterfaces.td",
+        "include/mlir/Interfaces/CastInterfaces.td",
         "include/mlir/Interfaces/ControlFlowInterfaces.td",
         "include/mlir/Interfaces/ViewLikeInterface.td",
         ":OpBaseTdFiles",
@@ -1599,6 +1605,7 @@ cc_library(
     includes = ["include"],
     deps = [
         ":CallOpInterfaces",
+        ":CastOpInterfaces",
         ":CommonFolders",
         ":ControlFlowInterfaces",
         ":EDSC",
@@ -3041,6 +3048,7 @@ filegroup(
     srcs = [
         "include/mlir/Dialect/Tensor/IR/TensorBase.td",
         "include/mlir/Dialect/Tensor/IR/TensorOps.td",
+        "include/mlir/Interfaces/CastInterfaces.td",
         "include/mlir/Interfaces/ControlFlowInterfaces.td",
         ":OpBaseTdFiles",
         ":SideEffectTdFiles",
@@ -3098,6 +3106,7 @@ cc_library(
     ],
     includes = ["include"],
     deps = [
+        ":CastOpInterfaces",
         ":ControlFlowInterfaces",
         ":IR",
         ":SideEffectInterfaces",
@@ -3573,6 +3582,43 @@ cc_library(
     ],
 )
 
+gentbl(
+    name = "CastOpInterfacesIncGen",
+    strip_include_prefix = "include",
+    tbl_outs = [
+        (
+            "-gen-op-interface-decls",
+            "include/mlir/Interfaces/CastInterfaces.h.inc",
+        ),
+        (
+            "-gen-op-interface-defs",
+            "include/mlir/Interfaces/CastInterfaces.cpp.inc",
+        ),
+    ],
+    tblgen = ":mlir-tblgen",
+    td_file = "include/mlir/Interfaces/CastInterfaces.td",
+    td_srcs = [
+        ":OpBaseTdFiles",
+    ],
+)
+
+cc_library(
+    name = "CastOpInterfaces",
+    srcs = [
+        "lib/Interfaces/CastInterfaces.cpp",
+    ],
+    hdrs = [
+        "include/mlir/Interfaces/CastInterfaces.h",
+    ],
+    includes = ["include"],
+    deps = [
+        ":CastOpInterfacesIncGen",
+        ":IR",
+        ":Support",
+        "@llvm-project//llvm:Support",
+    ],
+)
+
 gentbl(
     name = "ControlFlowInterfacesIncGen",
     strip_include_prefix = "include",
@@ -5289,6 +5335,8 @@ exports_files(
         "include/mlir/Bindings/Python/Attributes.td",
         "include/mlir/Interfaces/CallInterfaces.h",
         "include/mlir/Interfaces/CallInterfaces.td",
+        "include/mlir/Interfaces/CastInterfaces.h",
+        "include/mlir/Interfaces/CastInterfaces.td",
         "include/mlir/Interfaces/ControlFlowInterfaces.h",
         "include/mlir/Interfaces/ControlFlowInterfaces.td",
         "include/mlir/Interfaces/CopyOpInterface.td",