diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dfec698..d723f2a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,6 +7,15 @@ jobs:
       fail-fast: false
       matrix:
         branch: [devel]
+        compiler:
+          - name: nim
+            version: devel
+          - name: nim
+            version: version-2-0
+          - name: nim
+            version: version-1-6
+          - name: nimskull
+            version: "*"
         target: [linux, macos, windows]
         arch: [i386, amd64]
         include:
@@ -29,7 +38,9 @@ jobs:
         exclude:
           - target: macos
             arch: i386
-    name: ${{ matrix.target }} on ${{ matrix.arch }} (Nim ${{ matrix.branch }})
+    name:
+      ${{ matrix.target }} on ${{ matrix.arch }} (${{ matrix.compiler.name }}
+      ${{ matrix.compiler.version }})
     runs-on: ${{ matrix.builder }}
 
     defaults:
@@ -56,12 +67,19 @@ jobs:
             libstdc++-10-dev-i386-cross
           mkdir -p ~/.config/nim
           cat << EOF > ~/.config/nim/nim.cfg
+          cpu = "i386"
           gcc.exe = "i686-linux-gnu-gcc-10"
           gcc.cpp.exe = "i686-linux-gnu-g++-10"
           gcc.linkerexe = "i686-linux-gnu-gcc-10"
           gcc.cpp.linkerexe = "i686-linux-gnu-g++-10"
           EOF
 
+      - name: Configure target architecture for Windows (i386)
+        if: matrix.arch == 'i386' && runner.os == 'Windows'
+        run: |
+          mkdir -p "$APPDATA/nim"
+          echo 'cpu = "i386"' >> "$APPDATA/nim/nim.cfg"
+
       - name: Setup GCC (Windows-only)
         if: runner.os == 'Windows'
         uses: bwoodsend/setup-winlibs-action@v1.14
@@ -69,17 +87,45 @@ jobs:
           architecture: ${{ matrix.winlib_arch }}
 
       - name: Setup Nim
+        if: matrix.compiler.name == 'nim'
         uses: alaviss/setup-nim@0.1.1
         with:
           path: nim
-          version: ${{ matrix.branch }}
+          version: ${{ matrix.compiler.version }}
           architecture: ${{ matrix.arch }}
 
+      - name: Setup nimskull
+        id: nimskull
+        if: matrix.compiler.name == 'nimskull'
+        uses: nim-works/setup-nimskull@0.1.0
+        with:
+          nimskull-version: ${{ matrix.compiler.version }}
+
+      - name: Fetch nimble source for nimskull
+        if: matrix.compiler.name == 'nimskull'
+        uses: actions/checkout@v4.1.1
+        with:
+          path: nimble
+          repository: alaviss/nimble
+          ref: nimskull
+
+      - name: Install nimble for nimskull
+        if: matrix.compiler.name == 'nimskull'
+        run: |
+          nim c -d:release -o:"$NIMSKULL_BIN/nimble" src/nimble.nim
+          # Add nimble binary folder to PATH
+          echo "$HOME/.nimble/bin" >> "$GITHUB_PATH"
+        working-directory: nimble
+        env:
+          NIMSKULL_BIN: ${{ steps.nimskull.outputs.bin-path }}
+
       - name: Install dependencies
-        run: nimble install -y --depsOnly
+        run: |
+          nimble install -y --depsOnly
+          nimble install -y "https://github.com/disruptek/balls@^=3.9.11"
 
       - name: Run tests
-        run: nimble test
+        run: balls
 
       - name: Build docs
         shell: bash
diff --git a/readme.md b/readme.md
index a179d19..5975db8 100644
--- a/readme.md
+++ b/readme.md
@@ -1,7 +1,7 @@
 # An abstraction layer for common operating system services
 
 [![CI status](https://github.com/alaviss/nim-sys/workflows/CI/badge.svg)](https://github.com/alaviss/nim-sys/actions?query=workflow%3ACI)
-![Minimum supported Nim version](https://img.shields.io/badge/nim-1.5.1%2B-informational?style=flat&logo=nim)
+![Minimum supported Nim version](https://img.shields.io/badge/nim-1.6.0%2B-informational?style=flat&logo=nim)
 [![License](https://img.shields.io/github/license/alaviss/nim-sys?style=flat)](#license)
 
 This package is an experiment in rewriting various parts of stdlib's `os` module.
diff --git a/sys.nimble b/sys.nimble
index 363fb7d..1b5bc14 100644
--- a/sys.nimble
+++ b/sys.nimble
@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.1.0"
+version       = "0.0.1"
 author        = "Leorize"
 description   = "Abstractions for common operating system services"
 license       = "MIT"
@@ -9,12 +9,11 @@ srcDir        = "src"
 
 # Dependencies
 
-requires "nim >= 1.5.1"
-requires "https://github.com/disruptek/balls >= 3.9.0 & < 4.0.0"
-when (NimMajor, NimMinor, NimPatch) < (1, 9, 0):
-  requires "https://github.com/nim-works/cps >= 0.8.0 & < 0.9.0"
+requires "nim >= 1.6.0"
+when not defined(isNimSkull) && (NimMajor, NimMinor, NimPatch) < (1, 9, 0):
+  requires "https://github.com/nim-works/cps ^= 0.8.0"
 else:
-  requires "https://github.com/nim-works/cps >= 0.9.0 & < 0.10.0"
+  requires "https://github.com/nim-works/cps ^= 0.10.0"
 requires "https://github.com/status-im/nim-stew#3c91b8694e15137a81ec7db37c6c58194ec94a6a"
 
 # Bundled as submodule instead since the package can only be installed on Windows.