diff --git a/.azure-pipelines/azure-pipelines-linux.yml b/.azure-pipelines/azure-pipelines-linux.yml
index 2893a15..14df0dd 100755
--- a/.azure-pipelines/azure-pipelines-linux.yml
+++ b/.azure-pipelines/azure-pipelines-linux.yml
@@ -8,15 +8,16 @@ jobs:
     vmImage: ubuntu-latest
   strategy:
     matrix:
-      linux_64_r_base4.2:
-        CONFIG: linux_64_r_base4.2
-        UPLOAD_PACKAGES: 'True'
-        DOCKER_IMAGE: quay.io/condaforge/linux-anvil-cos7-x86_64
       linux_64_r_base4.3:
         CONFIG: linux_64_r_base4.3
         UPLOAD_PACKAGES: 'True'
         DOCKER_IMAGE: quay.io/condaforge/linux-anvil-cos7-x86_64
+      linux_64_r_base4.4:
+        CONFIG: linux_64_r_base4.4
+        UPLOAD_PACKAGES: 'True'
+        DOCKER_IMAGE: quay.io/condaforge/linux-anvil-cos7-x86_64
   timeoutInMinutes: 360
+  variables: {}
 
   steps:
   # configure qemu binfmt-misc running.  This allows us to run docker containers
diff --git a/.ci_support/linux_64_r_base4.3.yaml b/.ci_support/linux_64_r_base4.3.yaml
index 13280d7..aed26b6 100644
--- a/.ci_support/linux_64_r_base4.3.yaml
+++ b/.ci_support/linux_64_r_base4.3.yaml
@@ -1,5 +1,5 @@
 cdt_name:
-- cos6
+- cos7
 channel_sources:
 - conda-forge
 channel_targets:
diff --git a/.ci_support/linux_64_r_base4.2.yaml b/.ci_support/linux_64_r_base4.4.yaml
similarity index 94%
rename from .ci_support/linux_64_r_base4.2.yaml
rename to .ci_support/linux_64_r_base4.4.yaml
index 8d9a2e9..a9caf48 100644
--- a/.ci_support/linux_64_r_base4.2.yaml
+++ b/.ci_support/linux_64_r_base4.4.yaml
@@ -1,5 +1,5 @@
 cdt_name:
-- cos6
+- cos7
 channel_sources:
 - conda-forge
 channel_targets:
@@ -13,6 +13,6 @@ pin_run_as_build:
     min_pin: x.x
     max_pin: x.x
 r_base:
-- '4.2'
+- '4.4'
 target_platform:
 - linux-64
diff --git a/.ci_support/migrations/r-base44_and_m2w64-ucrt.yaml b/.ci_support/migrations/r-base44_and_m2w64-ucrt.yaml
new file mode 100644
index 0000000..ee9f9ba
--- /dev/null
+++ b/.ci_support/migrations/r-base44_and_m2w64-ucrt.yaml
@@ -0,0 +1,50 @@
+migrator_ts: 1718391654
+__migrator:
+  kind: version
+  migration_number: 1
+  bump_number: 1
+  commit_message: "Rebuild for r-base 4.4 and UCRT mingw toolchain"
+  primary_key: r_base
+  automerge: True
+  longterm: True
+  include_noarch: True
+  pr_limit: 40
+  override_cbc_keys:
+    - r-base
+    - r_base
+    - m2w64_c_compiler_stub
+    - m2w64_cxx_compiler_stub
+    - m2w64_fortran_compiler_stub
+  ordering:
+    m2w64_c_compiler:
+      - m2w64-toolchain
+      - gcc
+    m2w64_cxx_compiler:
+      - m2w64-toolchain
+      - gxx
+    m2w64_fortran_compiler:
+      - m2w64-toolchain
+      - gfortran
+    m2w64_c_stdlib:
+      - m2w64-toolchain
+      - m2w64-sysroot
+
+r_base:
+  - 4.3
+  - 4.4
+m2w64_c_compiler:                 # [win]
+  - gcc                           # [win]
+m2w64_c_compiler_version:         # [win]
+  - 13                            # [win]
+m2w64_cxx_compiler:               # [win]
+  - gxx                           # [win]
+m2w64_cxx_compiler_version:       # [win]
+  - 13                            # [win]
+m2w64_fortran_compiler:           # [win]
+  - gfortran                      # [win]
+m2w64_fortran_compiler_version:   # [win]
+  - 13                            # [win]
+m2w64_c_stdlib:                   # [win]
+  - m2w64-sysroot                 # [win]
+m2w64_c_stdlib_version:           # [win]
+  - 12                            # [win]
diff --git a/.gitattributes b/.gitattributes
index 7f32763..18f114a 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -20,8 +20,8 @@ bld.bat text eol=crlf
 .travis.yml linguist-generated=true
 .scripts/* linguist-generated=true
 .woodpecker.yml linguist-generated=true
-LICENSE.txt linguist-generated=true
-README.md linguist-generated=true
+/LICENSE.txt linguist-generated=true
+/README.md linguist-generated=true
 azure-pipelines.yml linguist-generated=true
 build-locally.py linguist-generated=true
 shippable.yml linguist-generated=true
diff --git a/.scripts/build_steps.sh b/.scripts/build_steps.sh
index f017291..6c805a9 100755
--- a/.scripts/build_steps.sh
+++ b/.scripts/build_steps.sh
@@ -34,9 +34,9 @@ CONDARC
 export CONDA_LIBMAMBA_SOLVER_NO_CHANNELS_FROM_INSTALLED=1
 
 mamba install --update-specs --yes --quiet --channel conda-forge --strict-channel-priority \
-    pip mamba conda-build boa conda-forge-ci-setup=4
+    pip mamba conda-build conda-forge-ci-setup=4 "conda-build>=24.1"
 mamba update --update-specs --yes --quiet --channel conda-forge --strict-channel-priority \
-    pip mamba conda-build boa conda-forge-ci-setup=4
+    pip mamba conda-build conda-forge-ci-setup=4 "conda-build>=24.1"
 
 # set up the condarc
 setup_conda_rc "${FEEDSTOCK_ROOT}" "${RECIPE_ROOT}" "${CONFIG_FILE}"
@@ -65,10 +65,16 @@ if [[ "${BUILD_WITH_CONDA_DEBUG:-0}" == 1 ]]; then
     # Drop into an interactive shell
     /bin/bash
 else
-    conda mambabuild "${RECIPE_ROOT}" -m "${CI_SUPPORT}/${CONFIG}.yaml" \
+    conda-build "${RECIPE_ROOT}" -m "${CI_SUPPORT}/${CONFIG}.yaml" \
         --suppress-variables ${EXTRA_CB_OPTIONS:-} \
         --clobber-file "${CI_SUPPORT}/clobber_${CONFIG}.yaml" \
         --extra-meta flow_run_id="${flow_run_id:-}" remote_url="${remote_url:-}" sha="${sha:-}"
+    ( startgroup "Inspecting artifacts" ) 2> /dev/null
+
+    # inspect_artifacts was only added in conda-forge-ci-setup 4.6.0
+    command -v inspect_artifacts >/dev/null 2>&1 && inspect_artifacts || echo "inspect_artifacts needs conda-forge-ci-setup >=4.6.0"
+
+    ( endgroup "Inspecting artifacts" ) 2> /dev/null
     ( startgroup "Validating outputs" ) 2> /dev/null
 
     validate_recipe_outputs "${FEEDSTOCK_NAME}"
diff --git a/build-locally.py b/build-locally.py
index 3f4b7a7..e0d408d 100755
--- a/build-locally.py
+++ b/build-locally.py
@@ -64,8 +64,9 @@ def verify_config(ns):
     elif ns.config.startswith("osx"):
         if "OSX_SDK_DIR" not in os.environ:
             raise RuntimeError(
-                "Need OSX_SDK_DIR env variable set. Run 'export OSX_SDK_DIR=SDKs' "
-                "to download the SDK automatically to 'SDKs/MacOSX<ver>.sdk'. "
+                "Need OSX_SDK_DIR env variable set. Run 'export OSX_SDK_DIR=$PWD/SDKs' "
+                "to download the SDK automatically to '$PWD/SDKs/MacOSX<ver>.sdk'. "
+                "Note: OSX_SDK_DIR must be set to an absolute path. "
                 "Setting this variable implies agreement to the licensing terms of the SDK by Apple."
             )
 
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index 39923ee..58b2b3b 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -1,6 +1,5 @@
 {% set version = "1.6.4" %}
 {% set posix = 'm2-' if win else '' %}
-{% set native = 'm2w64-' if win else '' %}
 
 package:
   name: r-htmlwidgets
@@ -13,8 +12,7 @@ source:
   sha256: 7cb08f0b30485dac26f72e4056ec4ed8825d1398e8b9f25ed63db228fe3a0ed0
 
 build:
-  merge_build_host: true  # [win]
-  number: 1
+  number: 2
   noarch: generic
   rpaths:
     - lib/R/lib/