diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7298b95e..ac4d864e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -52,7 +52,6 @@ jobs:
       - pre-commit
     uses: ./.github/workflows/ubuntu.yml
     with:
-      is_nightly: ${{ github.event_name == 'schedule' }}
       ppc_tasks: ${{ needs.ci-scope.outputs.ppc_tasks || 'all' }}
   mac:
     needs:
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 01f3106f..72a65421 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -3,11 +3,6 @@ name: Ubuntu
 on:
   workflow_call:
     inputs:
-      is_nightly:
-        description: 'Is nightly CI run'
-        required: false
-        type: boolean
-        default: false
       ppc_tasks:
         description: 'Tasks to build'
         required: false
@@ -28,7 +23,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
     strategy:
       matrix:
-        os: ${{ fromJSON(inputs.is_nightly && '["ubuntu-24.04","ubuntu-24.04-arm"]' || '["ubuntu-24.04"]') }}
+        os: ["ubuntu-24.04"]
         build_type: [Release, Debug]
     steps:
       - uses: actions/checkout@v6
@@ -83,7 +78,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
     strategy:
       matrix:
-        os: ${{ fromJSON(inputs.is_nightly && '["ubuntu-24.04","ubuntu-24.04-arm"]' || '["ubuntu-24.04"]') }}
+        os: ["ubuntu-24.04"]
     steps:
       - uses: actions/checkout@v6
       - name: Download installed package
@@ -115,7 +110,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
     strategy:
       matrix:
-        os: ${{ fromJSON(inputs.is_nightly && '["ubuntu-24.04","ubuntu-24.04-arm"]' || '["ubuntu-24.04"]') }}
+        os: ["ubuntu-24.04"]
     steps:
       - uses: actions/checkout@v6
       - name: Download installed package
@@ -139,7 +134,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
     strategy:
       matrix:
-        os: ${{ fromJSON(inputs.is_nightly && '["ubuntu-24.04","ubuntu-24.04-arm"]' || '["ubuntu-24.04"]') }}
+        os: ["ubuntu-24.04"]
     steps:
       - uses: actions/checkout@v6
         with:
@@ -185,7 +180,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
     strategy:
       matrix:
-        os: ${{ fromJSON(inputs.is_nightly && '["ubuntu-24.04","ubuntu-24.04-arm"]' || '["ubuntu-24.04"]') }}
+        os: ["ubuntu-24.04"]
     steps:
       - uses: actions/checkout@v6
       - name: Download installed package
@@ -217,7 +212,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
     strategy:
       matrix:
-        os: ${{ fromJSON(inputs.is_nightly && '["ubuntu-24.04","ubuntu-24.04-arm"]' || '["ubuntu-24.04"]') }}
+        os: ["ubuntu-24.04"]
     steps:
       - uses: actions/checkout@v6
       - name: Download installed package
diff --git a/docs/locale/en/LC_MESSAGES/user_guide/ci.po b/docs/locale/en/LC_MESSAGES/user_guide/ci.po
index 9da4c2cf..4aa644e0 100644
--- a/docs/locale/en/LC_MESSAGES/user_guide/ci.po
+++ b/docs/locale/en/LC_MESSAGES/user_guide/ci.po
@@ -51,8 +51,8 @@ msgstr ""
 
 #: ../../../../docs/user_guide/ci.rst:13
 msgid ""
-"Platform builds and tests (Ubuntu, macOS, Windows) — Ubuntu (GCC/Clang, "
-"amd64+arm), macOS (Clang), Windows (MSVC/Clang‑CL); functional tests via "
+"Platform builds and tests (Ubuntu, macOS, Windows) — Ubuntu (GCC/Clang), "
+"macOS (Clang), Windows (MSVC/Clang‑CL); functional tests via "
 "``scripts/run_tests.py`` for threads (``--counts 1 2 3 4``; extended ``5 "
 "7 11 13``) and processes (MPI, ``--counts 1 2 3 4``)."
 msgstr ""
diff --git a/docs/locale/ru/LC_MESSAGES/user_guide/ci.po b/docs/locale/ru/LC_MESSAGES/user_guide/ci.po
index 5db53b01..c17af1f3 100644
--- a/docs/locale/ru/LC_MESSAGES/user_guide/ci.po
+++ b/docs/locale/ru/LC_MESSAGES/user_guide/ci.po
@@ -58,13 +58,13 @@ msgstr ""
 
 #: ../../../../docs/user_guide/ci.rst:13
 msgid ""
-"Platform builds and tests (Ubuntu, macOS, Windows) — Ubuntu (GCC/Clang, "
-"amd64+arm), macOS (Clang), Windows (MSVC/Clang‑CL); functional tests via "
+"Platform builds and tests (Ubuntu, macOS, Windows) — Ubuntu (GCC/Clang), "
+"macOS (Clang), Windows (MSVC/Clang‑CL); functional tests via "
 "``scripts/run_tests.py`` for threads (``--counts 1 2 3 4``; extended ``5 "
 "7 11 13``) and processes (MPI, ``--counts 1 2 3 4``)."
 msgstr ""
 "Сборки и тесты на платформах (Ubuntu, macOS, Windows) — Ubuntu "
-"(GCC/Clang, amd64+arm), macOS (Clang), Windows (MSVC/Clang‑CL); "
+"(GCC/Clang), macOS (Clang), Windows (MSVC/Clang‑CL); "
 "функциональные тесты через ``scripts/run_tests.py`` для потоков "
 "(``--counts 1 2 3 4``; расширенно ``5 7 11 13``) и процессов (MPI, "
 "``--counts 1 2 3 4``)."
diff --git a/docs/user_guide/ci.rst b/docs/user_guide/ci.rst
index cc116e5a..31f5eb33 100644
--- a/docs/user_guide/ci.rst
+++ b/docs/user_guide/ci.rst
@@ -10,7 +10,7 @@ High‑level pipeline
 
 - Pre-commit checks (fast) — runs repository hooks on changed files; fix locally via ``pre-commit run -a``.
 
-- Platform builds and tests (Ubuntu, macOS, Windows) — Ubuntu (GCC/Clang, amd64+arm), macOS (Clang), Windows (MSVC/Clang‑CL); functional tests via ``scripts/run_tests.py`` for threads (``--counts 1 2 3 4``; extended ``5 7 11 13``) and processes (MPI, ``--counts 1 2 3 4``).
+- Platform builds and tests (Ubuntu, macOS, Windows) — Ubuntu (GCC/Clang), macOS (Clang), Windows (MSVC/Clang‑CL); functional tests via ``scripts/run_tests.py`` for threads (``--counts 1 2 3 4``; extended ``5 7 11 13``) and processes (MPI, ``--counts 1 2 3 4``).
 
 - Sanitizers (Ubuntu/Clang) — Address/UB/Leak; tests use ``PPC_ASAN_RUN=1`` to skip valgrind.