diff --git a/.github/workflows/changelog.yml b/.github/workflows/changelog.yml
index 3e35e5f1..04737aa8 100644
--- a/.github/workflows/changelog.yml
+++ b/.github/workflows/changelog.yml
@@ -5,7 +5,7 @@ on:
 
 jobs:
   test:
-    runs-on: ${{ env.UBUNTU_VERSION }}
+    runs-on: ${{ vars.UBUNTU_VERSION }}
     steps:
     - uses: actions/checkout@v1
       with:
diff --git a/.github/workflows/esprc.yml b/.github/workflows/esprc.yml
index cf069d59..0d18749e 100644
--- a/.github/workflows/esprc.yml
+++ b/.github/workflows/esprc.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   parse:
-    runs-on: ${{ env.UBUNTU_VERSION }}
+    runs-on: ${{ vars.UBUNTU_VERSION }}
     strategy:
       matrix:
         ap:
@@ -18,7 +18,7 @@ jobs:
     - uses: actions/checkout@v1
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: ${{ env.MSRV }}
+        toolchain: ${{ vars.MSRV }}
         profile: minimal
         default: true
         override: true
@@ -28,7 +28,7 @@ jobs:
         args: --release --bin esprc -- ./schemas/APs/10303-${{ matrix.ap }}-aim-long.exp --check
 
   generate:
-    runs-on: ${{ env.UBUNTU_VERSION }}
+    runs-on: ${{ vars.UBUNTU_VERSION }}
     strategy:
       matrix:
         ap:
@@ -38,7 +38,7 @@ jobs:
     - uses: actions/checkout@v1
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: ${{ env.MSRV }}
+        toolchain: ${{ vars.MSRV }}
         profile: minimal
         components: rustfmt
         default: true
diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 5685b0fa..afce9694 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -7,12 +7,12 @@ on:
 
 jobs:
   pages:
-    runs-on: ${{ env.UBUNTU_VERSION }}
+    runs-on: ${{ vars.UBUNTU_VERSION }}
     steps:
     - uses: actions/checkout@v2
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: ${{ env.MSRV }}
+        toolchain: ${{ vars.MSRV }}
         profile: minimal
         default: true
         override: true
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index dc1cc5d1..6962fe99 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -8,12 +8,12 @@ on:
 
 jobs:
   test:
-    runs-on: ${{ env.UBUNTU_VERSION }}
+    runs-on: ${{ vars.UBUNTU_VERSION }}
     strategy:
       matrix:
         rust:
           - stable
-          - ${{ env.MSRV }}
+          - ${{ vars.MSRV }}
     steps:
     - uses: actions/checkout@v1
     - uses: actions-rs/toolchain@v1
@@ -30,12 +30,12 @@ jobs:
         args: --all-features
 
   check-format:
-    runs-on: ${{ env.UBUNTU_VERSION }}
+    runs-on: ${{ vars.UBUNTU_VERSION }}
     steps:
     - uses: actions/checkout@v1
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: ${{ env.MSRV }}
+        toolchain: ${{ vars.MSRV }}
         profile: minimal
         components: rustfmt
         default: true
@@ -46,12 +46,12 @@ jobs:
         args: -- --check
 
   doc:
-    runs-on: ${{ env.UBUNTU_VERSION }}
+    runs-on: ${{ vars.UBUNTU_VERSION }}
     steps:
     - uses: actions/checkout@v1
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: ${{ env.MSRV }}
+        toolchain: ${{ vars.MSRV }}
         profile: minimal
         default: true
         override: true
@@ -61,12 +61,12 @@ jobs:
         args: --no-deps
 
   clippy:
-    runs-on: ${{ env.UBUNTU_VERSION }}
+    runs-on: ${{ vars.UBUNTU_VERSION }}
     steps:
     - uses: actions/checkout@v1
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: ${{ env.MSRV }}
+        toolchain: ${{ vars.MSRV }}
         profile: minimal
         components: clippy
         default: true