diff --git a/.github/workflows/test_package.yml b/.github/workflows/test_package.yml
index f7eacd9..b99530b 100644
--- a/.github/workflows/test_package.yml
+++ b/.github/workflows/test_package.yml
@@ -10,6 +10,9 @@ on:
       wheel_version:
         default: 2.15.3
 
+env:
+  wheel_version: ${{ inputs.wheel_version || '2.15.3' }}
+
 jobs:
   job1:
     name: Test package on ubuntu
@@ -27,7 +30,7 @@ jobs:
         python-version: ${{ matrix.python_version }}
     - name: Install dependencies
       run: |
-        python -m pip install pyexiv2==${{ github.event.inputs.wheel_version }}
+        python -m pip install pyexiv2==${{ env.wheel_version }}
         python -m pip install pytest psutil
     - name: Test
       run: |
@@ -53,7 +56,7 @@ jobs:
         python-version: ${{ matrix.python_version }}
     - name: Install dependencies
       run: |
-        python -m pip install pyexiv2==${{ github.event.inputs.wheel_version }}
+        python -m pip install pyexiv2==${{ env.wheel_version }}
         python -m pip install pytest psutil
     - name: Test
       run: |
@@ -80,7 +83,7 @@ jobs:
         python-version: ${{ matrix.python_version }}
     - name: Install dependencies
       run: |
-        python -m pip install pyexiv2==${{ github.event.inputs.wheel_version }}
+        python -m pip install pyexiv2==${{ env.wheel_version }}
         python -m pip install pytest psutil
     - name: Test
       run: |