diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5e39221ec84..f4292f34cd4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -10,13 +10,9 @@ jobs:
     env:
       ACTIONS_ALLOW_UNSECURE_COMMANDS: true
       PLATFORM: windows64
-      OPAMYES: 1
-      OPAMROOT: D:\.opam
-      CYG_MIRROR: http://mirrors.kernel.org/sourceware/cygwin/
       ARCH: 64
       MINGW_ARCH: x86_64
-      CYGWIN_SETUP: https://cygwin.com/setup-x86_64.exe
-      CYG_ROOT: C:/cygwin64
+      CYG_ROOT: D:\cygwin
     steps:
       - uses: actions/checkout@main
         with:
@@ -27,12 +23,20 @@ jobs:
           echo "C:\msys64\usr\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
           rm C:\msys64\usr\bin\bash.exe
 
-      - name: Cache opam
-        id: cache-opam
-        uses: actions/cache@v3.0.11
+      - name: choco install nsis
+        uses: nick-invision/retry@v1
         with:
-          path: D:\.opam
-          key: ${{ runner.os }}64-${{ hashFiles('./opam', './libs/') }}
+          timeout_minutes: 10
+          max_attempts: 10
+          command: choco install --no-progress nsis.portable --version 3.02 -y
+
+      - name: choco install things
+        shell: pwsh
+        run: choco install --no-progress curl wget 7zip.portable -y
+
+      - name: Prepend Chocolatey path
+        shell: pwsh
+        run: Write-Host "::add-path::C:\ProgramData\chocolatey\bin"
 
       - name: Install Neko from S3
         shell: pwsh
@@ -46,47 +50,33 @@ jobs:
       - name: Print Neko version
         run: neko -version 2>&1
 
-      - name: choco install nsis
-        uses: nick-invision/retry@v1
+      - name: Setup ocaml
+        uses: ocaml/setup-ocaml@v2
         with:
-          timeout_minutes: 10
-          max_attempts: 10
-          command: choco install --no-progress nsis.portable --version 3.02 -y
-      - name: choco install things
-        shell: pwsh
-        run: choco install --no-progress curl wget 7zip.portable -y
-      - name: Prepend Chocolatey path
-        shell: pwsh
-        run: Write-Host "::add-path::C:\ProgramData\chocolatey\bin"
+          ocaml-compiler: 4.08.1
+          opam-repositories: |
+            opam-repository-mingw: https://github.com/ocaml-opam/opam-repository-mingw.git#sunset
+            default: https://github.com/ocaml/opam-repository.git
+          opam-local-packages: |
+            haxe.opam
 
-      - name: Install OCaml
+      - name: Install dependencies
         shell: pwsh
         run: |
           Set-PSDebug -Trace 1
-          curl.exe -fsSL -o cygwin-setup.exe --retry 3 $($env:CYGWIN_SETUP)
-          Start-Process -FilePath "cygwin-setup.exe" -ArgumentList "-B -q -R $($env:CYG_ROOT) -l C:/tmp -s $($env:CYG_MIRROR) -P default -P make -P git -P zlib-devel -P rsync -P patch -P diffutils -P curl -P unzip -P tar -P m4 -P perl -P libpcre2-devel -P mbedtls-devel -P mingw64-$($env:MINGW_ARCH)-zlib -P mingw64-$($env:MINGW_ARCH)-gcc-core -P mingw64-$($env:MINGW_ARCH)-pcre2" -Wait -RedirectStandardOutput cygwin-setup-out.txt
-          Get-Content cygwin-setup-out.txt
-          curl.exe -fsSL -o "opam.tar.xz" --retry 3 https://github.com/fdopen/opam-repository-mingw/releases/download/0.0.0.2/opam$($env:ARCH).tar.xz
           curl.exe -fsSL -o "libmbedtls.tar.xz" --retry 3 https://github.com/Simn/mingw64-mbedtls/releases/download/2.16.3/mingw64-$($env:MINGW_ARCH)-mbedtls-2.16.3-1.tar.xz
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'curl -L https://cpanmin.us | perl - App::cpanminus')
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cpanm IPC::System::Simple module')
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cpanm String::ShellQuote')
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'echo "$OLDPWD"')
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && tar -C / -xvf libmbedtls.tar.xz')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && tar -xf opam.tar.xz')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && bash opam${ARCH}/install.sh')
 
       - name: Install OCaml libraries
-        if: steps.cache-opam.outputs.cache-hit != 'true'
         shell: pwsh
         run: |
           Set-PSDebug -Trace 1
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam init mingw "https://github.com/fdopen/opam-repository-mingw.git#opam2" --comp 4.07.0+mingw${ARCH}c --switch 4.07.0+mingw${ARCH}c --auto-setup --yes 2>&1')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam update --yes 2>&1')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && opam pin add haxe . --kind=path --no-action --yes 2>&1')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam install haxe --deps-only --yes 2>&1')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam list')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'ocamlopt -v')
+          opam install haxe --deps-only
+          opam list
 
       - name: Expose mingw dll files
         shell: pwsh
@@ -116,6 +106,13 @@ jobs:
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && cygcheck ./haxelib.exe')
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && ls ./out')
 
+      - name: Check artifact
+        shell: bash
+        run: |
+          ls out
+          # Output should contain binaries zip, installer zip and nupkg
+          [ $(ls -1 out | wc -l) -eq "3" ]
+
       - name: Upload artifact
         uses: actions/upload-artifact@v1.0.0
         with:
@@ -128,13 +125,9 @@ jobs:
     env:
       ACTIONS_ALLOW_UNSECURE_COMMANDS: true
       PLATFORM: windows
-      OPAMYES: 1
-      OPAMROOT: D:\.opam
-      CYG_MIRROR: http://mirrors.kernel.org/sourceware/cygwin-archive/20221123
       ARCH: 32
       MINGW_ARCH: i686
-      CYGWIN_SETUP: https://cygwin.com/setup-x86.exe
-      CYG_ROOT: C:/cygwin
+      CYG_ROOT: D:\cygwin
     steps:
       - uses: actions/checkout@main
         with:
@@ -145,12 +138,20 @@ jobs:
           echo "C:\msys64\usr\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
           rm C:\msys64\usr\bin\bash.exe
 
-      - name: Cache opam
-        id: cache-opam
-        uses: actions/cache@v3.0.11
+      - name: choco install nsis
+        uses: nick-invision/retry@v1
         with:
-          path: D:\.opam
-          key: ${{ runner.os }}32-${{ hashFiles('./opam', './libs/') }}
+          timeout_minutes: 10
+          max_attempts: 10
+          command: choco install --no-progress nsis.portable --version 3.02 -y
+
+      - name: choco install things
+        shell: pwsh
+        run: choco install --no-progress curl wget 7zip.portable -y
+
+      - name: Prepend Chocolatey path
+        shell: pwsh
+        run: Write-Host "::add-path::C:\ProgramData\chocolatey\bin"
 
       - name: Install Neko from S3
         shell: pwsh
@@ -164,48 +165,52 @@ jobs:
       - name: Print Neko version
         run: neko -version 2>&1
 
-      - name: choco install nsis
-        uses: nick-invision/retry@v1
+      - name: Setup ocaml
+        id: ocaml
+        continue-on-error: true
+        uses: kLabz/setup-ocaml@win32
         with:
-          timeout_minutes: 10
-          max_attempts: 10
-          command: choco install --no-progress nsis.portable --version 3.02 -y
-      - name: choco install things
-        shell: pwsh
-        run: choco install --no-progress curl wget 7zip.portable -y
-      - name: Prepend Chocolatey path
-        shell: pwsh
-        run: Write-Host "::add-path::C:\ProgramData\chocolatey\bin"
+          ocaml-compiler: 4.08.1
+          opam-depext: false
+          opam-repositories: |
+            opam-repository-mingw: https://github.com/ocaml-opam/opam-repository-mingw.git#sunset
+            default: https://github.com/ocaml/opam-repository.git
+          opam-local-packages: |
+            haxe.opam
+          cache-prefix: w32-v1
+
+      # TODO make it work on first try
+      # (when cygwin cache doesn't exist, ocaml install fails with a curl error)
+      - name: Setup ocaml (second chance)
+        if: steps.ocaml.outcome == 'failure'
+        uses: kLabz/setup-ocaml@win32
+        with:
+          ocaml-compiler: 4.08.1
+          opam-depext: false
+          opam-repositories: |
+            opam-repository-mingw: https://github.com/ocaml-opam/opam-repository-mingw.git#sunset
+            default: https://github.com/ocaml/opam-repository.git
+          opam-local-packages: |
+            haxe.opam
+          cache-prefix: w32-v1
 
-      - name: Install OCaml
+      - name: Install dependencies
         shell: pwsh
         run: |
           Set-PSDebug -Trace 1
-          curl.exe -fsSL -o cygwin-setup.exe --retry 3 $($env:CYGWIN_SETUP)
-          Start-Process -FilePath "cygwin-setup.exe" -ArgumentList "-B -q -R $($env:CYG_ROOT) -l C:/tmp -s $($env:CYG_MIRROR) -P default -P make -P git -P zlib-devel -P rsync -P patch -P diffutils -P curl -P unzip -P tar -P m4 -P perl -P libpcre2-devel -P mbedtls-devel -P mingw64-$($env:MINGW_ARCH)-zlib -P mingw64-$($env:MINGW_ARCH)-gcc-core -P mingw64-$($env:MINGW_ARCH)-pcre2 --allow-unsupported-windows" -Wait -RedirectStandardOutput cygwin-setup-out.txt
-          Get-Content cygwin-setup-out.txt
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('--norc', '--noprofile', '/etc/postinstall/ca-certificates.sh')
-          curl.exe -fsSL -o "opam.tar.xz" --retry 3 https://github.com/fdopen/opam-repository-mingw/releases/download/0.0.0.2/opam$($env:ARCH).tar.xz
           curl.exe -fsSL -o "libmbedtls.tar.xz" --retry 3 https://github.com/Simn/mingw64-mbedtls/releases/download/2.16.3/mingw64-$($env:MINGW_ARCH)-mbedtls-2.16.3-1.tar.xz
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'curl -L https://cpanmin.us | perl - App::cpanminus')
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cpanm IPC::System::Simple module')
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cpanm String::ShellQuote')
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'echo "$OLDPWD"')
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && tar -C / -xvf libmbedtls.tar.xz')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && tar -xf opam.tar.xz')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && bash opam${ARCH}/install.sh')
 
       - name: Install OCaml libraries
-        if: steps.cache-opam.outputs.cache-hit != 'true'
         shell: pwsh
         run: |
           Set-PSDebug -Trace 1
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam init mingw "https://github.com/fdopen/opam-repository-mingw.git#opam2" --comp 4.07.0+mingw${ARCH}c --switch 4.07.0+mingw${ARCH}c --auto-setup --yes 2>&1')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam update --yes 2>&1')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && opam pin add haxe . --kind=path --no-action --yes 2>&1')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam install haxe --deps-only --yes 2>&1')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam list')
-          & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'ocamlopt -v')
+          opam install haxe --deps-only
+          opam list
 
       - name: Expose mingw dll files
         shell: pwsh
@@ -235,6 +240,13 @@ jobs:
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && cygcheck ./haxelib.exe')
           & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && ls ./out')
 
+      - name: Check artifact
+        shell: bash
+        run: |
+          ls out
+          # Output should contain binaries zip, installer zip and nupkg
+          [ $(ls -1 out | wc -l) -eq "3" ]
+
       - name: Upload artifact
         uses: actions/upload-artifact@v1.0.0
         with:
@@ -257,7 +269,7 @@ jobs:
         uses: actions/cache@v3.0.11
         with:
           path: ~/.opam/
-          key: ${{ runner.os }}-${{ hashFiles('./opam', './libs/') }}-2
+          key: ${{ runner.os }}-${{ hashFiles('./haxe.opam', './libs/') }}-2
 
       - name: Install Neko from S3
         run: |
@@ -572,7 +584,7 @@ jobs:
         uses: actions/cache@v3.0.11
         with:
           path: ~/.opam/
-          key: ${{ runner.os }}-${{ hashFiles('./opam', './libs/') }}-2
+          key: ${{ runner.os }}-${{ hashFiles('./haxe.opam', './libs/') }}-2
 
       - name: Install Neko from S3
         run: |
@@ -625,14 +637,13 @@ jobs:
           make && make install
           cd ..
 
-
       - name: Install OCaml libraries
         if: steps.cache-opam.outputs.cache-hit != 'true'
         run: |
           set -ex
           opam init # --disable-sandboxing
           opam update
-          opam switch create 4.07.1
+          opam switch create 4.08.1
           eval $(opam env)
           opam env
           opam pin add ctypes 0.17.1 --yes
diff --git a/Earthfile b/Earthfile
index 123f491b8f7..8f399bb103a 100644
--- a/Earthfile
+++ b/Earthfile
@@ -91,7 +91,7 @@ devcontainer:
     RUN git config --global codespaces-theme.hide-status 1
 
     # Install OCaml libraries
-    COPY opam .
+    COPY haxe.opam .
     RUN opam init --disable-sandboxing
     RUN opam install . --yes --deps-only --no-depexts
     RUN opam list
diff --git a/extra/github-actions/build-mac.yml b/extra/github-actions/build-mac.yml
index 71f8d9f726f..b0287955209 100644
--- a/extra/github-actions/build-mac.yml
+++ b/extra/github-actions/build-mac.yml
@@ -32,14 +32,13 @@
     make && make install
     cd ..
 
-
 - name: Install OCaml libraries
   if: steps.cache-opam.outputs.cache-hit != 'true'
   run: |
     set -ex
     opam init # --disable-sandboxing
     opam update
-    opam switch create 4.07.1
+    opam switch create 4.08.1
     eval $(opam env)
     opam env
     opam pin add ctypes 0.17.1 --yes
diff --git a/extra/github-actions/build-windows.yml b/extra/github-actions/build-windows.yml
index 29b24567861..a4a6a3626f3 100644
--- a/extra/github-actions/build-windows.yml
+++ b/extra/github-actions/build-windows.yml
@@ -26,6 +26,13 @@
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && cygcheck ./haxelib.exe')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && ls ./out')
 
+- name: Check artifact
+  shell: bash
+  run: |
+    ls out
+    # Output should contain binaries zip, installer zip and nupkg
+    [ $(ls -1 out | wc -l) -eq "3" ]
+
 - name: Upload artifact
   uses: actions/upload-artifact@v1.0.0
   with:
diff --git a/extra/github-actions/cache-opam-windows.yml b/extra/github-actions/cache-opam-windows.yml
new file mode 100644
index 00000000000..5270fbf1fed
--- /dev/null
+++ b/extra/github-actions/cache-opam-windows.yml
@@ -0,0 +1,6 @@
+- name: Cache opam
+  id: cache-opam
+  uses: actions/cache@v3.0.11
+  with:
+    path: D:\.opam
+    key: ${{ runner.os }}${{ env.ARCH }}-${{ hashFiles('./haxe.opam', './libs/') }}
diff --git a/extra/github-actions/cache-opam.yml b/extra/github-actions/cache-opam.yml
index ee27a7a12c8..faaee00b723 100644
--- a/extra/github-actions/cache-opam.yml
+++ b/extra/github-actions/cache-opam.yml
@@ -3,4 +3,4 @@
   uses: actions/cache@v3.0.11
   with:
     path: ~/.opam/
-    key: ${{ runner.os }}-${{ hashFiles('./opam', './libs/') }}-2
+    key: ${{ runner.os }}-${{ hashFiles('./haxe.opam', './libs/') }}-2
diff --git a/extra/github-actions/install-nsis.yml b/extra/github-actions/install-nsis.yml
index 33ce6f1db18..13d67d0241e 100644
--- a/extra/github-actions/install-nsis.yml
+++ b/extra/github-actions/install-nsis.yml
@@ -4,9 +4,11 @@
     timeout_minutes: 10
     max_attempts: 10
     command: choco install --no-progress nsis.portable --version 3.02 -y
+
 - name: choco install things
   shell: pwsh
   run: choco install --no-progress curl wget 7zip.portable -y
+
 - name: Prepend Chocolatey path
   shell: pwsh
   run: Write-Host "::add-path::C:\ProgramData\chocolatey\bin"
diff --git a/extra/github-actions/install-ocaml-libs-windows.yml b/extra/github-actions/install-ocaml-libs-windows.yml
index e0abf154eb1..9a24a4b33ee 100644
--- a/extra/github-actions/install-ocaml-libs-windows.yml
+++ b/extra/github-actions/install-ocaml-libs-windows.yml
@@ -1,11 +1,6 @@
 - name: Install OCaml libraries
-  if: steps.cache-opam.outputs.cache-hit != 'true'
   shell: pwsh
   run: |
     Set-PSDebug -Trace 1
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam init mingw "https://github.com/fdopen/opam-repository-mingw.git#opam2" --comp 4.07.0+mingw${ARCH}c --switch 4.07.0+mingw${ARCH}c --auto-setup --yes 2>&1')
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam update --yes 2>&1')
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && opam pin add haxe . --kind=path --no-action --yes 2>&1')
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam install haxe --deps-only --yes 2>&1')
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam list')
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'ocamlopt -v')
+    opam install haxe --deps-only
+    opam list
diff --git a/extra/github-actions/install-ocaml-windows.yml b/extra/github-actions/install-ocaml-windows.yml
index 3a0d18c32ac..6902f4eef3b 100644
--- a/extra/github-actions/install-ocaml-windows.yml
+++ b/extra/github-actions/install-ocaml-windows.yml
@@ -1,17 +1,39 @@
-- name: Install OCaml
+- name: Setup ocaml
+  id: ocaml
+  continue-on-error: true
+  uses: kLabz/setup-ocaml@win32
+  with:
+    ocaml-compiler: 4.08.1
+    opam-depext: false
+    opam-repositories: |
+      opam-repository-mingw: https://github.com/ocaml-opam/opam-repository-mingw.git#sunset
+      default: https://github.com/ocaml/opam-repository.git
+    opam-local-packages: |
+      haxe.opam
+    cache-prefix: w32-v1
+
+# TODO make it work on first try
+# (when cygwin cache doesn't exist, ocaml install fails with a curl error)
+- name: Setup ocaml (second chance)
+  if: steps.ocaml.outcome == 'failure'
+  uses: kLabz/setup-ocaml@win32
+  with:
+    ocaml-compiler: 4.08.1
+    opam-depext: false
+    opam-repositories: |
+      opam-repository-mingw: https://github.com/ocaml-opam/opam-repository-mingw.git#sunset
+      default: https://github.com/ocaml/opam-repository.git
+    opam-local-packages: |
+      haxe.opam
+    cache-prefix: w32-v1
+
+- name: Install dependencies
   shell: pwsh
   run: |
     Set-PSDebug -Trace 1
-    curl.exe -fsSL -o cygwin-setup.exe --retry 3 $($env:CYGWIN_SETUP)
-    Start-Process -FilePath "cygwin-setup.exe" -ArgumentList "-B -q -R $($env:CYG_ROOT) -l C:/tmp -s $($env:CYG_MIRROR) -P default -P make -P git -P zlib-devel -P rsync -P patch -P diffutils -P curl -P unzip -P tar -P m4 -P perl -P libpcre2-devel -P mbedtls-devel -P mingw64-$($env:MINGW_ARCH)-zlib -P mingw64-$($env:MINGW_ARCH)-gcc-core -P mingw64-$($env:MINGW_ARCH)-pcre2 --allow-unsupported-windows" -Wait -RedirectStandardOutput cygwin-setup-out.txt
-    Get-Content cygwin-setup-out.txt
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('--norc', '--noprofile', '/etc/postinstall/ca-certificates.sh')
-    curl.exe -fsSL -o "opam.tar.xz" --retry 3 https://github.com/fdopen/opam-repository-mingw/releases/download/0.0.0.2/opam$($env:ARCH).tar.xz
     curl.exe -fsSL -o "libmbedtls.tar.xz" --retry 3 https://github.com/Simn/mingw64-mbedtls/releases/download/2.16.3/mingw64-$($env:MINGW_ARCH)-mbedtls-2.16.3-1.tar.xz
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'curl -L https://cpanmin.us | perl - App::cpanminus')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cpanm IPC::System::Simple module')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cpanm String::ShellQuote')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'echo "$OLDPWD"')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && tar -C / -xvf libmbedtls.tar.xz')
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && tar -xf opam.tar.xz')
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && bash opam${ARCH}/install.sh')
diff --git a/extra/github-actions/install-ocaml-windows64.yml b/extra/github-actions/install-ocaml-windows64.yml
index 1f4a087fc08..ccf6cdfb2a9 100644
--- a/extra/github-actions/install-ocaml-windows64.yml
+++ b/extra/github-actions/install-ocaml-windows64.yml
@@ -1,16 +1,20 @@
-- name: Install OCaml
+- name: Setup ocaml
+  uses: ocaml/setup-ocaml@v2
+  with:
+    ocaml-compiler: 4.08.1
+    opam-repositories: |
+      opam-repository-mingw: https://github.com/ocaml-opam/opam-repository-mingw.git#sunset
+      default: https://github.com/ocaml/opam-repository.git
+    opam-local-packages: |
+      haxe.opam
+
+- name: Install dependencies
   shell: pwsh
   run: |
     Set-PSDebug -Trace 1
-    curl.exe -fsSL -o cygwin-setup.exe --retry 3 $($env:CYGWIN_SETUP)
-    Start-Process -FilePath "cygwin-setup.exe" -ArgumentList "-B -q -R $($env:CYG_ROOT) -l C:/tmp -s $($env:CYG_MIRROR) -P default -P make -P git -P zlib-devel -P rsync -P patch -P diffutils -P curl -P unzip -P tar -P m4 -P perl -P libpcre2-devel -P mbedtls-devel -P mingw64-$($env:MINGW_ARCH)-zlib -P mingw64-$($env:MINGW_ARCH)-gcc-core -P mingw64-$($env:MINGW_ARCH)-pcre2" -Wait -RedirectStandardOutput cygwin-setup-out.txt
-    Get-Content cygwin-setup-out.txt
-    curl.exe -fsSL -o "opam.tar.xz" --retry 3 https://github.com/fdopen/opam-repository-mingw/releases/download/0.0.0.2/opam$($env:ARCH).tar.xz
     curl.exe -fsSL -o "libmbedtls.tar.xz" --retry 3 https://github.com/Simn/mingw64-mbedtls/releases/download/2.16.3/mingw64-$($env:MINGW_ARCH)-mbedtls-2.16.3-1.tar.xz
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'curl -L https://cpanmin.us | perl - App::cpanminus')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cpanm IPC::System::Simple module')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cpanm String::ShellQuote')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'echo "$OLDPWD"')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && tar -C / -xvf libmbedtls.tar.xz')
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && tar -xf opam.tar.xz')
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && bash opam${ARCH}/install.sh')
diff --git a/extra/github-actions/workflows/main.yml b/extra/github-actions/workflows/main.yml
index c860a56db09..8b14f97de65 100644
--- a/extra/github-actions/workflows/main.yml
+++ b/extra/github-actions/workflows/main.yml
@@ -9,13 +9,9 @@ jobs:
     env:
       ACTIONS_ALLOW_UNSECURE_COMMANDS: true
       PLATFORM: windows64
-      OPAMYES: 1
-      OPAMROOT: D:\.opam
-      CYG_MIRROR: http://mirrors.kernel.org/sourceware/cygwin/
       ARCH: 64
       MINGW_ARCH: x86_64
-      CYGWIN_SETUP: https://cygwin.com/setup-x86_64.exe
-      CYG_ROOT: C:/cygwin64
+      CYG_ROOT: D:\cygwin
     steps:
       - uses: actions/checkout@main
         with:
@@ -26,15 +22,8 @@ jobs:
           echo "C:\msys64\usr\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
           rm C:\msys64\usr\bin\bash.exe
 
-      - name: Cache opam
-        id: cache-opam
-        uses: actions/cache@v3.0.11
-        with:
-          path: D:\.opam
-          key: ${{ runner.os }}64-${{ hashFiles('./opam', './libs/') }}
-
-      @import install-neko-windows.yml
       @import install-nsis.yml
+      @import install-neko-windows.yml
       @import install-ocaml-windows64.yml
       @import install-ocaml-libs-windows.yml
       @import build-windows.yml
@@ -44,13 +33,9 @@ jobs:
     env:
       ACTIONS_ALLOW_UNSECURE_COMMANDS: true
       PLATFORM: windows
-      OPAMYES: 1
-      OPAMROOT: D:\.opam
-      CYG_MIRROR: http://mirrors.kernel.org/sourceware/cygwin-archive/20221123
       ARCH: 32
       MINGW_ARCH: i686
-      CYGWIN_SETUP: https://cygwin.com/setup-x86.exe
-      CYG_ROOT: C:/cygwin
+      CYG_ROOT: D:\cygwin
     steps:
       - uses: actions/checkout@main
         with:
@@ -61,15 +46,8 @@ jobs:
           echo "C:\msys64\usr\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
           rm C:\msys64\usr\bin\bash.exe
 
-      - name: Cache opam
-        id: cache-opam
-        uses: actions/cache@v3.0.11
-        with:
-          path: D:\.opam
-          key: ${{ runner.os }}32-${{ hashFiles('./opam', './libs/') }}
-
-      @import install-neko-windows.yml
       @import install-nsis.yml
+      @import install-neko-windows.yml
       @import install-ocaml-windows.yml
       @import install-ocaml-libs-windows.yml
       @import build-windows.yml
diff --git a/opam b/haxe.opam
similarity index 97%
rename from opam
rename to haxe.opam
index 2304be278e2..e9f4edfe681 100644
--- a/opam
+++ b/haxe.opam
@@ -19,7 +19,7 @@ build: [
 install: [make "install" "INSTALL_DIR=%{prefix}%"]
 remove: [make "uninstall" "INSTALL_DIR=%{prefix}%"]
 depends: [
-  "ocaml" {>= "4.02"}
+  "ocaml" {>= "4.08"}
   "ocamlfind" {build}
   "dune" {>= "1.11"}
   "camlp5" {build & = "8.00"}
diff --git a/src/macro/eval/evalLuv.ml b/src/macro/eval/evalLuv.ml
index 990d7923906..a399d910859 100644
--- a/src/macro/eval/evalLuv.ml
+++ b/src/macro/eval/evalLuv.ml
@@ -2389,8 +2389,8 @@ let passwd_fields = [
 		encode_result (fun (p:Passwd.t) ->
 			encode_obj_s [
 				"username",encode_string p.username;
-				"uid",vint p.uid;
-				"gid",vint p.gid;
+				"uid",vint (Unsigned.ULong.to_int p.uid);
+				"gid",vint (Unsigned.ULong.to_int p.gid);
 				"shell",encode_nullable encode_string p.shell;
 				"homedir",vnative_string p.homedir;
 			]