diff --git a/lib/util/exec/env.ts b/lib/util/exec/env.ts
index 27a2a618377636ca08a0b14f7ddb3a634cb1ebc6..55b557c1fc70c310506fa90c267a55ac405f4bb5 100644
--- a/lib/util/exec/env.ts
+++ b/lib/util/exec/env.ts
@@ -4,6 +4,8 @@ const basicEnvVars = [
   'NO_PROXY',
   'HOME',
   'PATH',
+  'LC_ALL',
+  'LANG',
   'DOCKER_HOST',
 ];
 
diff --git a/test/execUtil.ts b/test/execUtil.ts
index 4277fe307542541e38c8607aeee1895348cbafd4..d583c2c3f8eb2dce54050765c808083d3ba19a8a 100644
--- a/test/execUtil.ts
+++ b/test/execUtil.ts
@@ -71,6 +71,8 @@ const basicEnvMock = {
   NO_PROXY: 'localhost',
   HOME: '/home/user',
   PATH: '/tmp/path',
+  LANG: 'en_US.UTF-8',
+  LC_ALL: 'en_US',
 };
 
 const fullEnvMock = {
diff --git a/test/manager/bundler/__snapshots__/artifacts.spec.ts.snap b/test/manager/bundler/__snapshots__/artifacts.spec.ts.snap
index 5b255c6b07ccec515b5881f4cec8fa2b509a6e01..9ba7eff927b0b1189f669e03e1c03a1ffa6d18a6 100644
--- a/test/manager/bundler/__snapshots__/artifacts.spec.ts.snap
+++ b/test/manager/bundler/__snapshots__/artifacts.spec.ts.snap
@@ -22,6 +22,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -52,6 +54,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -73,6 +77,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -103,6 +109,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -133,6 +141,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/manager/cargo/__snapshots__/artifacts.spec.ts.snap b/test/manager/cargo/__snapshots__/artifacts.spec.ts.snap
index 03acfd59774a2592dc54634ad7bc8add7d66f8c3..8d17352b12933573e7e7219fda8f742580560706 100644
--- a/test/manager/cargo/__snapshots__/artifacts.spec.ts.snap
+++ b/test/manager/cargo/__snapshots__/artifacts.spec.ts.snap
@@ -22,6 +22,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -41,6 +43,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -66,6 +70,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/manager/composer/__snapshots__/artifacts.spec.ts.snap b/test/manager/composer/__snapshots__/artifacts.spec.ts.snap
index 2a25850fe4321ad705b9740ade44b1c4882cb049..ac5d76a35183789a20d30b8a01e6d50094908107 100644
--- a/test/manager/composer/__snapshots__/artifacts.spec.ts.snap
+++ b/test/manager/composer/__snapshots__/artifacts.spec.ts.snap
@@ -34,6 +34,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -54,6 +56,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -74,6 +78,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -100,6 +106,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -120,6 +128,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -140,6 +150,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/manager/gomod/__snapshots__/artifacts.spec.ts.snap b/test/manager/gomod/__snapshots__/artifacts.spec.ts.snap
index 972d4c7bb3170c6dc0501894a9f5fc6c9d69bc8c..d524642ff16a022827d55b05fd492527a1c21ad2 100644
--- a/test/manager/gomod/__snapshots__/artifacts.spec.ts.snap
+++ b/test/manager/gomod/__snapshots__/artifacts.spec.ts.snap
@@ -27,6 +27,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -47,6 +49,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -67,6 +71,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -87,6 +93,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -102,6 +110,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -122,6 +132,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -142,6 +154,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/manager/gradle/__snapshots__/index.spec.ts.snap b/test/manager/gradle/__snapshots__/index.spec.ts.snap
index 842f975d00a46a587680cecd30a75c583d88a1d0..06f1e8de212e0bd15557c59c30feb8408b342cf2 100644
--- a/test/manager/gradle/__snapshots__/index.spec.ts.snap
+++ b/test/manager/gradle/__snapshots__/index.spec.ts.snap
@@ -11,6 +11,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -31,6 +33,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -51,6 +55,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -71,6 +77,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -91,6 +99,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -234,6 +244,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -318,6 +330,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -461,6 +475,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -483,6 +499,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -505,6 +523,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -525,6 +545,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -545,6 +567,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -606,6 +630,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/manager/mix/__snapshots__/artifacts.spec.ts.snap b/test/manager/mix/__snapshots__/artifacts.spec.ts.snap
index 4931cc2816d34bb663ec211aa4880ad4001940df..e2d8cc87e02930e5f54cd294a093aad3be3604db 100644
--- a/test/manager/mix/__snapshots__/artifacts.spec.ts.snap
+++ b/test/manager/mix/__snapshots__/artifacts.spec.ts.snap
@@ -22,6 +22,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -52,6 +54,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/manager/pip_setup/__snapshots__/extract.spec.ts.snap b/test/manager/pip_setup/__snapshots__/extract.spec.ts.snap
index ebbda780f2101fc8d65db25ba4604b6720380856..9cba163ce72b1f6d6925af754237588a9591b5d8 100644
--- a/test/manager/pip_setup/__snapshots__/extract.spec.ts.snap
+++ b/test/manager/pip_setup/__snapshots__/extract.spec.ts.snap
@@ -13,6 +13,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -27,6 +29,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -41,6 +45,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/manager/pip_setup/__snapshots__/index.spec.ts.snap b/test/manager/pip_setup/__snapshots__/index.spec.ts.snap
index ba761234a85175bb7a6cce85c29a929885699606..b49b25d68534073bce6a5688272bba8be6908e1a 100644
--- a/test/manager/pip_setup/__snapshots__/index.spec.ts.snap
+++ b/test/manager/pip_setup/__snapshots__/index.spec.ts.snap
@@ -11,6 +11,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -25,6 +27,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -39,6 +43,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -53,6 +59,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -329,6 +337,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -343,6 +353,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -357,6 +369,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -371,6 +385,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -391,6 +407,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -405,6 +423,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -419,6 +439,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -433,6 +455,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/manager/pipenv/__snapshots__/artifacts.spec.ts.snap b/test/manager/pipenv/__snapshots__/artifacts.spec.ts.snap
index a03c90d07b2f844f76f67513c1e2a3dd6a0e8933..32d9421f5a402fe0ef1db5e1f92e940c3aea012f 100644
--- a/test/manager/pipenv/__snapshots__/artifacts.spec.ts.snap
+++ b/test/manager/pipenv/__snapshots__/artifacts.spec.ts.snap
@@ -22,6 +22,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
         "PIPENV_CACHE_DIR": "/tmp/renovate/cache/others/pipenv",
@@ -42,6 +44,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
         "PIPENV_CACHE_DIR": "/tmp/renovate/cache/others/pipenv",
@@ -62,6 +66,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
         "PIPENV_CACHE_DIR": "/tmp/renovate/cache/others/pipenv",
diff --git a/test/manager/poetry/__snapshots__/artifacts.spec.ts.snap b/test/manager/poetry/__snapshots__/artifacts.spec.ts.snap
index 3ff6e9a74e473bedfe827c42a601211ddb0537d8..4bedb2d680c751243d3ce653006bb290936eb671 100644
--- a/test/manager/poetry/__snapshots__/artifacts.spec.ts.snap
+++ b/test/manager/poetry/__snapshots__/artifacts.spec.ts.snap
@@ -23,6 +23,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -42,6 +44,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -67,6 +71,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/util/env.spec.ts b/test/util/env.spec.ts
index d9ae4710b5bad195da3761f7660a5dda55ae85ca..6bba70d2c3076b623974679ae0d70eebb81f392f 100644
--- a/test/util/env.spec.ts
+++ b/test/util/env.spec.ts
@@ -7,6 +7,8 @@ describe('getChildProcess environment when trustlevel set to low', () => {
     'NO_PROXY',
     'HOME',
     'PATH',
+    'LC_ALL',
+    'LANG',
     'DOCKER_HOST',
   ];
   beforeEach(() => {
@@ -24,6 +26,8 @@ describe('getChildProcess environment when trustlevel set to low', () => {
         "HOME": "HOME",
         "HTTPS_PROXY": "HTTPS_PROXY",
         "HTTP_PROXY": "HTTP_PROXY",
+        "LANG": "LANG",
+        "LC_ALL": "LC_ALL",
         "NO_PROXY": "NO_PROXY",
         "PATH": "PATH",
       }
@@ -34,14 +38,16 @@ describe('getChildProcess environment when trustlevel set to low', () => {
     expect(getChildProcessEnv()).not.toHaveProperty('PATH');
   });
   it('returns custom environment variables if passed and defined', () => {
-    process.env.LANG = 'LANG';
-    expect(getChildProcessEnv(['LANG'])).toMatchInlineSnapshot(`
+    process.env.FOOBAR = 'FOOBAR';
+    expect(getChildProcessEnv(['FOOBAR'])).toMatchInlineSnapshot(`
       Object {
         "DOCKER_HOST": "DOCKER_HOST",
+        "FOOBAR": "FOOBAR",
         "HOME": "HOME",
         "HTTPS_PROXY": "HTTPS_PROXY",
         "HTTP_PROXY": "HTTP_PROXY",
         "LANG": "LANG",
+        "LC_ALL": "LC_ALL",
         "NO_PROXY": "NO_PROXY",
         "PATH": "PATH",
       }
diff --git a/test/util/exec.spec.ts b/test/util/exec.spec.ts
index 14f8a0f69e6e8be62b145801292a0d2068fd9acf..dc38a1b55cd7edda4729fd709c43618dde768813 100644
--- a/test/util/exec.spec.ts
+++ b/test/util/exec.spec.ts
@@ -378,6 +378,8 @@ describe(`Child process execution wrapper`, () => {
   });
 
   it('Supports image prefetch', async () => {
+    process.env = processEnv;
+
     const actualCmd: string[] = [];
     cpExec.mockImplementation((execCmd, execOpts, callback) => {
       actualCmd.push(execCmd);
diff --git a/test/workers/branch/lock-files/__snapshots__/lerna.spec.ts.snap b/test/workers/branch/lock-files/__snapshots__/lerna.spec.ts.snap
index 74584ecbcc2d8b7f7ca47a431c56a17df871b54b..b44886867ef60b4257ca6396f62a32d3559dba7a 100644
--- a/test/workers/branch/lock-files/__snapshots__/lerna.spec.ts.snap
+++ b/test/workers/branch/lock-files/__snapshots__/lerna.spec.ts.snap
@@ -11,6 +11,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -30,6 +32,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -49,6 +53,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -68,6 +74,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/workers/branch/lock-files/__snapshots__/npm.spec.ts.snap b/test/workers/branch/lock-files/__snapshots__/npm.spec.ts.snap
index fdec78de8a3b418b97f1022d2457909bcede3be3..9e790124ba2556f9479a288f6cd26a89b1871d84 100644
--- a/test/workers/branch/lock-files/__snapshots__/npm.spec.ts.snap
+++ b/test/workers/branch/lock-files/__snapshots__/npm.spec.ts.snap
@@ -17,6 +17,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -38,6 +40,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/workers/branch/lock-files/__snapshots__/pnpm.spec.ts.snap b/test/workers/branch/lock-files/__snapshots__/pnpm.spec.ts.snap
index 269ea2bbeb2df1cf8e6d3a40319b204b8174864d..ba66c4780885cf4c37822b53963066dda8ccf036 100644
--- a/test/workers/branch/lock-files/__snapshots__/pnpm.spec.ts.snap
+++ b/test/workers/branch/lock-files/__snapshots__/pnpm.spec.ts.snap
@@ -11,6 +11,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -30,6 +32,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -49,6 +53,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -68,6 +74,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -87,6 +95,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -106,6 +116,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
diff --git a/test/workers/branch/lock-files/__snapshots__/yarn.spec.ts.snap b/test/workers/branch/lock-files/__snapshots__/yarn.spec.ts.snap
index 67fe97aeedc31b0d5e0523f0279ab93bd215c702..b497dc1c6fbb27be8a3f55dde7282068b4c9aad6 100644
--- a/test/workers/branch/lock-files/__snapshots__/yarn.spec.ts.snap
+++ b/test/workers/branch/lock-files/__snapshots__/yarn.spec.ts.snap
@@ -11,6 +11,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -30,6 +32,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -44,6 +48,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -63,6 +69,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -82,6 +90,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -101,6 +111,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -115,6 +127,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -129,6 +143,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -148,6 +164,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -162,6 +180,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },
@@ -181,6 +201,8 @@ Array [
         "HOME": "/home/user",
         "HTTPS_PROXY": "https://example.com",
         "HTTP_PROXY": "http://example.com",
+        "LANG": "en_US.UTF-8",
+        "LC_ALL": "en_US",
         "NO_PROXY": "localhost",
         "PATH": "/tmp/path",
       },