diff --git a/.changeset/scientific-slim-variant.md b/.changeset/scientific-slim-variant.md
new file mode 100644
index 0000000..37088e1
--- /dev/null
+++ b/.changeset/scientific-slim-variant.md
@@ -0,0 +1,6 @@
+---
+'@platforma-open/milaboratories.runenv-python-3.12.10-scientific-slim': patch
+'@platforma-open/milaboratories.runenv-python-3': minor
+---
+
+Add `python-3.12.10-scientific-slim` runenv variant bundling only `polars-lts-cpu`, `numpy`, `scipy`, and `pyarrow`. Intended for blocks with tabular/scientific Python stacks that do not need the full ML toolchain (TensorFlow, torch, transformers, etc.) shipped by the base `3.12.10` runenv. Bundled size is ~100 MB vs. the base runenv's ~2.5 GB.
diff --git a/catalogue/package.json b/catalogue/package.json
index 45a5096..aacffe1 100644
--- a/catalogue/package.json
+++ b/catalogue/package.json
@@ -29,6 +29,9 @@
       },
       "3.12.10-parapred": {
         "reference": "@platforma-open/milaboratories.runenv-python-3.12.10-parapred/dist/tengo/software/main.sw.json"
+      },
+      "3.12.10-scientific-slim": {
+        "reference": "@platforma-open/milaboratories.runenv-python-3.12.10-scientific-slim/dist/tengo/software/main.sw.json"
       }
     }
   },
@@ -42,7 +45,8 @@
     "@platforma-open/milaboratories.runenv-python-3.12.10-sccoda": "workspace:*",
     "@platforma-open/milaboratories.runenv-python-3.12.10-rapids": "workspace:*",
     "@platforma-open/milaboratories.runenv-python-3.12.10-h5ad": "workspace:*",
-    "@platforma-open/milaboratories.runenv-python-3.12.10-parapred": "workspace:*"
+    "@platforma-open/milaboratories.runenv-python-3.12.10-parapred": "workspace:*",
+    "@platforma-open/milaboratories.runenv-python-3.12.10-scientific-slim": "workspace:*"
   },
   "devDependencies": {
     "@platforma-sdk/package-builder": "catalog:"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 2884034..8cf9440 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -77,6 +77,9 @@ importers:
       '@platforma-open/milaboratories.runenv-python-3.12.10-sccoda':
         specifier: workspace:*
         version: link:../python-3.12.10-sccoda
+      '@platforma-open/milaboratories.runenv-python-3.12.10-scientific-slim':
+        specifier: workspace:*
+        version: link:../python-3.12.10-scientific-slim
     devDependencies:
       '@platforma-sdk/package-builder':
         specifier: 'catalog:'
@@ -166,6 +169,18 @@ importers:
         specifier: 'catalog:'
         version: 4.20.6
 
+  python-3.12.10-scientific-slim:
+    devDependencies:
+      '@platforma-sdk/package-builder':
+        specifier: 'catalog:'
+        version: 3.10.7
+      runenv-python-builder:
+        specifier: workspace:*
+        version: link:../builder
+      tsx:
+        specifier: 'catalog:'
+        version: 4.20.6
+
 packages:
 
   '@aws-crypto/crc32@5.2.0':
@@ -1528,6 +1543,7 @@ packages:
   tar@7.4.3:
     resolution: {integrity: sha512-5S7Va8hKfV7W5U6g3aYxXmlPoZVAwUMy9AOKyF2fVuZa2UD3qZjg578OrLRt8PcNN1PleVaL/5/yYATNL0ICUw==}
     engines: {node: '>=18'}
+    deprecated: Old versions of tar are not supported, and contain widely publicized security vulnerabilities, which have been fixed in the current version. Please update. Support for old versions may be purchased (at exorbitant rates) by contacting i@izs.me
 
   term-size@2.2.1:
     resolution: {integrity: sha512-wK0Ri4fOGjv/XPy8SBHZChl8CM7uMc5VML7SqiQ0zG7+J5Vr+RMQDoHa2CNT6KHUnTGIXH34UDMkPzAUyapBZg==}
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 45c4068..a324e36 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -7,6 +7,7 @@ packages:
   - python-3.12.10-rapids
   - python-3.12.10-h5ad
   - python-3.12.10-parapred
+  - python-3.12.10-scientific-slim
   - catalogue
 
 catalog:
diff --git a/python-3.12.10-scientific-slim/config.json b/python-3.12.10-scientific-slim/config.json
new file mode 100644
index 0000000..601a9f6
--- /dev/null
+++ b/python-3.12.10-scientific-slim/config.json
@@ -0,0 +1,12 @@
+{
+  "packages": {
+    "dependencies": [
+      "polars-lts-cpu==1.33.1",
+      "numpy==2.2.6",
+      "scipy==1.15.3",
+      "pyarrow==21.0.0"
+    ],
+    "skip": {},
+    "platformSpecific": {}
+  }
+}
diff --git a/python-3.12.10-scientific-slim/package.json b/python-3.12.10-scientific-slim/package.json
new file mode 100644
index 0000000..a092b2a
--- /dev/null
+++ b/python-3.12.10-scientific-slim/package.json
@@ -0,0 +1,43 @@
+{
+  "name": "@platforma-open/milaboratories.runenv-python-3.12.10-scientific-slim",
+  "version": "1.0.0",
+  "description": "Python 3.12.10 run environment bundling polars-lts-cpu, numpy, scipy, and pyarrow for scientific/tabular workloads",
+  "scripts": {
+    "cleanup": "rm -rf ./pkg-*.tgz ./pydist ./dist/ ./build/",
+    "reset": "pnpm run cleanup && rm -rf ./node_modules ./.turbo",
+    "build": "pl-py-builder",
+    "after-prebuild": "pl-pkg publish packages",
+    "before-publish": "pl-pkg prepublish"
+  },
+  "files": [
+    "dist/"
+  ],
+  "block-software": {
+    "entrypoints": {
+      "main": {
+        "environment": {
+          "artifact": {
+            "type": "environment",
+            "runtime": "python",
+            "registry": "platforma-open",
+            "python-version": "3.12.10",
+            "roots": {
+              "linux-x64": "./pydist/linux-x64",
+              "linux-aarch64": "./pydist/linux-aarch64",
+              "macosx-x64": "./pydist/macosx-x64",
+              "macosx-aarch64": "./pydist/macosx-aarch64",
+              "windows-x64": "./pydist/windows-x64"
+            },
+            "binDir": "bin"
+          }
+        }
+      }
+    }
+  },
+  "license": "UNLICENSED",
+  "devDependencies": {
+    "@platforma-sdk/package-builder": "catalog:",
+    "runenv-python-builder": "workspace:*",
+    "tsx": "catalog:"
+  }
+}