diff --git a/.github/workflows/exercises.yml b/.github/workflows/exercises.yml
index 7b7260ad..089b1f9e 100644
--- a/.github/workflows/exercises.yml
+++ b/.github/workflows/exercises.yml
@@ -19,30 +19,22 @@ jobs:
           - nim: devel
             os: linux
 
-          - nim: '1.6.0'
+          - nim: '1.6.x'
             os: linux
 
     name: nim-${{ matrix.nim }}-${{ matrix.os }}
-    runs-on: ${{ matrix.os == 'linux' && 'ubuntu-24.04' || (matrix.os == 'macOS' && 'macos-26' || 'windows-2022') }}
+    runs-on: ${{ matrix.os == 'linux' && 'ubuntu-26.04' || (matrix.os == 'macOS' && 'macos-26' || 'windows-2022') }}
 
     steps:
       - name: Checkout exercism/nim
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
 
-      - name: Install Nim (devel)
-        if: matrix.nim == 'devel'
-        uses: alaviss/setup-nim@f81f2a6d1505ab32f440ec9d8adbb81e949d3bf0 # 0.1.1
+      - name: Install Nim
+        uses: jiro4989/setup-nim-action@cb1fc1270b117457dd0d9f610ec981fad3369cec # v2.3.0
         with:
-          path: 'nim'
-          version: ${{ matrix.nim }}
-
-      - name: Install Nim (non-devel)
-        if: matrix.nim != 'devel'
-        uses: iffy/install-nim@cceb6b4d10dcb1968575ac083d4981c0302fd00d # 5.1.1
-        with:
-          version: "binary:${{ matrix.nim }}"
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          nim-version: "${{ matrix.nim }}"
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+      - run: nimble build -Y
 
       - name: Show versions of Nim and Nimble
         run: |
diff --git a/.github/workflows/lint-whitespace.yml b/.github/workflows/lint-whitespace.yml
index 513541c4..abbac004 100644
--- a/.github/workflows/lint-whitespace.yml
+++ b/.github/workflows/lint-whitespace.yml
@@ -5,7 +5,7 @@ on: [push, pull_request, workflow_dispatch]
 jobs:
   lint_whitespace:
     name: Lint whitespace
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
diff --git a/.github/workflows/markdownlint.yml b/.github/workflows/markdownlint.yml
index a9bac53f..a313d7d9 100644
--- a/.github/workflows/markdownlint.yml
+++ b/.github/workflows/markdownlint.yml
@@ -5,7 +5,7 @@ on: [push, pull_request, workflow_dispatch]
 jobs:
   markdownlint:
     name: Lint markdown files
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
diff --git a/.github/workflows/shellcheck.yml b/.github/workflows/shellcheck.yml
index b10f15fd..a7613def 100644
--- a/.github/workflows/shellcheck.yml
+++ b/.github/workflows/shellcheck.yml
@@ -5,7 +5,7 @@ on: [push, pull_request, workflow_dispatch]
 jobs:
   shellcheck:
     name: Run shellcheck on scripts
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
diff --git a/.github/workflows/uuids.yml b/.github/workflows/uuids.yml
index 9618f523..64fc3fbd 100644
--- a/.github/workflows/uuids.yml
+++ b/.github/workflows/uuids.yml
@@ -3,7 +3,7 @@ on: [push, pull_request]
 
 jobs:
   check_uuids:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     env:
       NIM_VERSION: '2.2.4'