diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index d50e367..0a91b1e 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -78,7 +78,7 @@ jobs:
         echo "which tar"
         which tar
         export TAR="/usr/bin/tar"
-        R -e "library(devtools); install_github('fbourgin/Xtensor.R', ref = 'update_xtensor', configure.args = '--novendor')"
+        R -e "library(devtools); install_github('fbourgin/Xtensor.R', ref = 'update_xtensor_0.27', configure.args = '--novendor')"
 
     - name: print R HOME
       run: |
@@ -96,7 +96,7 @@ jobs:
         if [[ "${{matrix.sys.compiler}}" = "gcc" ]]; then export CC=gcc-${{matrix.sys.version}}; export CXX=g++-${{matrix.sys.version}}; else export CC=clang; export CXX=clang++; fi
         mkdir ~/.R
         touch ~/.R/Makevars
-        echo "CXX17=$CXX" >> ~/.R/Makevars
-        echo "CXX17FLAGS=-fPIC -O2" >> ~/.R/Makevars
+        echo "CXX20=$CXX" >> ~/.R/Makevars
+        echo "CXX20FLAGS=-fPIC -O2 -std=c++20" >> ~/.R/Makevars
         Rscript ./unittest.R
       
diff --git a/.github/workflows/osx.yml b/.github/workflows/osx.yml
index 71ab857..3a13282 100644
--- a/.github/workflows/osx.yml
+++ b/.github/workflows/osx.yml
@@ -51,7 +51,7 @@ jobs:
         echo "which tar"
         which tar
         export TAR="/usr/bin/tar"
-        R -e "library(devtools); install_github('fbourgin/Xtensor.R', ref = 'update_xtensor', configure.args = '--novendor')"
+        R -e "library(devtools); install_github('fbourgin/Xtensor.R', ref = 'update_xtensor_0.27', configure.args = '--novendor')"
 
     - name: print R HOME
       run: |
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 371b123..a0dcc01 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,8 +16,8 @@ set(XTENSOR_R_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/include)
 # Versionning
 # ===========
 
-set(XTENSOR_REQUIRED_VERSION 0.26.0)
-set(XTL_REQUIRED_VERSION 0.8.0)
+set(XTENSOR_REQUIRED_VERSION 0.27.1)
+set(XTL_REQUIRED_VERSION 0.8.1)
 
 set(XTENSOR_R_CONFIG_FILE
     "${XTENSOR_R_INCLUDE_DIR}/xtensor-r/xtensor_r_config.hpp")
@@ -57,7 +57,7 @@ add_library(xtensor-r INTERFACE)
 target_include_directories(xtensor-r INTERFACE $<BUILD_INTERFACE:${XTENSOR_R_INCLUDE_DIR}>
                                                $<INSTALL_INTERFACE:include>)
 
-target_compile_features(xtensor-r INTERFACE cxx_std_17)
+target_compile_features(xtensor-r INTERFACE cxx_std_20)
 
 target_link_libraries(xtensor-r INTERFACE xtensor)
 get_target_property(inc_dir xtensor-r INTERFACE_INCLUDE_DIRECTORIES)
diff --git a/environment-dev.yml b/environment-dev.yml
index 04ae19d..c7dc7ce 100644
--- a/environment-dev.yml
+++ b/environment-dev.yml
@@ -3,7 +3,7 @@ channels:
   - conda-forge
 dependencies:
   - cmake
-  - xtensor=0.26.0
+  - xtensor=0.27.1
   - r-base
   - r-rcpp
   # test dependencies
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 7c07bc4..3e43a44 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -32,13 +32,13 @@ include(CheckCXXCompilerFlag)
 string(TOUPPER "${CMAKE_BUILD_TYPE}" U_CMAKE_BUILD_TYPE)
 
 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Intel")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native -Wunused-parameter -Wextra -Wreorder -Wconversion")
-    CHECK_CXX_COMPILER_FLAG("-std=c++17" HAS_CPP17_FLAG)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native -Wunused-parameter -Wextra -Wreorder -Wconversion -D_LIBCPP_DISABLE_AVAILABILITY")
+    CHECK_CXX_COMPILER_FLAG("-std=c++20" HAS_CPP20_FLAG)
 
-    if (HAS_CPP17_FLAG)
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
+    if (HAS_CPP20_FLAG)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++20")
     else()
-        message(FATAL_ERROR "Unsupported compiler -- xtensor requires C++17 support!")
+        message(FATAL_ERROR "Unsupported compiler -- xtensor requires C++20 support!")
     endif()
 endif()
 
diff --git a/test/rcpp_tests.cpp b/test/rcpp_tests.cpp
index 7914fc1..2932203 100644
--- a/test/rcpp_tests.cpp
+++ b/test/rcpp_tests.cpp
@@ -7,7 +7,7 @@
 * The full license is in the file LICENSE, distributed with this software. *
 ****************************************************************************/
 
-// [[Rcpp::plugins(cpp17)]]
+// [[Rcpp::plugins(cpp20)]]
 // [[Rcpp::depends(xtensor)]]
 
 #include "xtensor-r/rcontainer.hpp"