diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6f2604a..fe27e49 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -66,7 +66,7 @@ jobs:
           password: GrandMaster
           database: jedi_order
           port: 34837
-          postgres-version: 17
+          postgres-version: 15
           postgis_version: 3.5.0
         id: postgres
 
@@ -82,3 +82,9 @@ jobs:
         if: matrix.os == 'windows-latest'
         run: |
           psql -v ON_ERROR_STOP=1 -c "SELECT PostGIS_Full_Version();" "${{ steps.postgres.outputs.connection-uri }}" | findstr /C:"POSTGIS=3.5.0 3.5.0"
+
+      - name: Verify PostGIS 3.5.0 installation on macOS
+        if: matrix.os == 'macos-latest'
+        run: |
+          psql -v ON_ERROR_STOP=1 -c "SELECT PostGIS_Full_Version();" "${{ steps.postgres.outputs.connection-uri }}" | grep "3.5.0"
+        
\ No newline at end of file
diff --git a/README.md b/README.md
index 20e6840..14b0be1 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ steps:
 | database         | The database name to setup and grant permissions to created user.                          | `postgres`                                                                                                                                                                            |
 | port             | The server port to listen on.                                                              | `5432`                                                                                                                                                                                |
 | postgres-version | The PostgreSQL version to install.                                                         | `17`                                                                                                                                                                                  |
-| postgis_version  | **(Windows only)** The PostGIS version to installed.                                       | By default (empty), will use the latest. See available versions [here](https://download.osgeo.org/postgis/windows/). If set, must use the entire version string like `3.3.3`          |
+| postgis_version  | **(Windows and macOS only)** The PostGIS version to install.                              | By default (empty), will use the latest. See available versions [here](https://download.osgeo.org/postgis/windows/). If set, must use the entire version string like `3.3.3`          |
 | cached-dir       | Where should the temporary downloads be placed. Used to download and cache PostGIS binary. | `downloads`                                                                                                                                                                           |
 
 #### Outputs
diff --git a/action.yml b/action.yml
index 84ba93e..c095675 100644
--- a/action.yml
+++ b/action.yml
@@ -70,11 +70,73 @@ runs:
         sudo apt-get install postgresql-$PG_VERSION-postgis-3
       shell: bash
 
+    - name: Check PostgreSQL version (macOS)
+      if: runner.os == 'macOS'
+      id: pg-version-mac
+      shell: bash
+      run: |
+        # Get major version using psql
+        PG_VERSION=$(psql -t -A -c "SELECT split_part(version(), ' ', 2)" '${{ steps.pg.outputs.connection-uri }}' | cut -d. -f1)
+        echo "Found PostgreSQL major version: $PG_VERSION"
+        
+        # Output version for next steps
+        echo "version=$PG_VERSION" >> $GITHUB_OUTPUT
+
+    - name: Setup PostgreSQL environment (macOS)
+      if: runner.os == 'macOS'
+      shell: bash
+      run: |
+        # Get PostgreSQL installation path using brew
+        PG_PREFIX=$(brew --prefix postgresql@${{ steps.pg-version-mac.outputs.version }})
+        echo "PostgreSQL prefix: $PG_PREFIX"
+        
+        # Set environment variables
+        echo "PATH=$PG_PREFIX/bin:$PATH" >> $GITHUB_ENV
+        echo "LDFLAGS=-L$PG_PREFIX/lib" >> $GITHUB_ENV
+        echo "CPPFLAGS=-I$PG_PREFIX/include" >> $GITHUB_ENV
+        echo "PKG_CONFIG_PATH=$PG_PREFIX/lib/pkgconfig" >> $GITHUB_ENV
+
     - name: Install PostGIS on macOS
       if: runner.os == 'macOS'
       shell: bash
-      run: brew install postgis
+      env: 
+        HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK: true
+        HOMEBREW_NO_INSTALL_UPGRADE: true
+      run: |
+        # If no version specified, install latest
+        if [[ -z "${{ inputs.postgis_version }}" ]]; then
+          brew install postgis -v
+          exit 0
+        fi
+        
+        # Read version mapping from JSON file
+        FORMULA_URL=$(jq -r '."${{ inputs.postgis_version }}"' ${GITHUB_ACTION_PATH}/postgis-macos-versions.json)
+        
+        if [[ "$FORMULA_URL" == "null" ]]; then
+          echo "Error: PostGIS version ${{ inputs.postgis_version }} is not supported on macOS"
+          exit 1
+        fi
+
+        # Download formula file
+        if ! wget "$FORMULA_URL" -O ./postgis.rb; then
+          echo "Error: Failed to download formula from $FORMULA_URL"
+          exit 1
+        fi
+
+        # Replace all postgresql@X references with detected version
+        sed -i '' 's/postgresql@[0-9]*/postgresql@${{ steps.pg-version-mac.outputs.version }}/g' ./postgis.rb
         
+        # Show the entire modified formula
+        echo "=== Modified formula content ==="
+        cat ./postgis.rb
+        echo "==========================="
+
+        # Install from local file
+        brew install ./postgis.rb -v -s
+
+        # Cleanup
+        rm -f ./postgis.rb
+
     - name: Detect PostgreSQL Version (Windows)
       if: runner.os == 'Windows'
       id: pg-version
diff --git a/postgis-macos-versions.json b/postgis-macos-versions.json
new file mode 100644
index 0000000..9c461cc
--- /dev/null
+++ b/postgis-macos-versions.json
@@ -0,0 +1,8 @@
+{
+  "3.5.2": "https://github.com/Homebrew/homebrew-core/raw/0e8cf73743fc1b148182ada18cbd1ea586e8b638/Formula/p/postgis.rb",
+  "3.5.1": "https://github.com/Homebrew/homebrew-core/raw/a78958a211e79d151309de3038d20add73306d6c/Formula/p/postgis.rb",
+  "3.5.0": "https://github.com/Homebrew/homebrew-core/raw/5975ad00882d998b3e1ef1fb2906000f23f18466/Formula/p/postgis.rb",
+  "3.4.3": "https://github.com/Homebrew/homebrew-core/raw/2858d71fabde44101eeb2a7bfbcf3b5ca2c2aa76/Formula/p/postgis.rb",
+  "3.4.2": "https://github.com/Homebrew/homebrew-core/raw/b1dbe7afb89d1860ed459b57d4e631de7c902462/Formula/p/postgis.rb",
+  "3.3.4": "https://github.com/Homebrew/homebrew-core/raw/fc8e7c36c7906eddd94ebf5109d57756a073f50f/Formula/p/postgis.rb"
+}