marimo-team/marimo 0.14.0 on GitHub

Highlights ⭐

🧮 Tables: small touches that go a long way. We're continuing to craft a delightful user experience for working with dataframes and tables.

Every table now comes with an expandable column viewer that lets you drill down into their data distribution:

column_explorer.mp4

You can now adjust the page size with a dropdown:

🤖 Improved AI chat experience. Our AI-powered chatbot — which knows about your data! — now supports reasoning tokens and persists chat history.

chat-sidebar.mp4

📦 Install package extras with our UI.

trevmanz.-.1932822219081589191.mp4

🐻‍❄️ Polars execution plans, with mermaid diagrams. Polars lazy-frames now produce an explain graph using mermaid.

⚡️ Connection state. Improved backend connection detection and disabled editor features until connected.

Many stability improvements and bug fixes.

What's Changed

tidy: store cleanup by @dmadisetti in #5121
chore(deps): update to ai-sdk/react (useChat import), isLoading → status by @bjoaquinc in #5127
improvement: improve uv projects detection by @mscolnick in #5123
chore: cleanup config passing to HTML from server by @mscolnick in #5120
fix: sync activeChatId with messages when creating new thread or switching threads by @bjoaquinc in #5130
docs: make contributing docs succinct by @winstxnhdw in #5128
docs: add example notebook link for slides layout by @Haleshot in #5138
fix: just exit on non-interactive terminals by @mscolnick in #5126
feat: add ai chat persistence between sessions by @bjoaquinc in #5141
docs: update watching.md to reflect support for data file watching by @Haleshot in #5137
fix: handle json duckdb datatype by @mscolnick in #5144
improvement: notebook schema serialization by @mscolnick in #5131
Minor correction in fileformat.py by @killickm in #5149
docs: fix image rendering in carousel preview by @Haleshot in #5148
improvement: selectable row viewer by @Light2Dark in #5147
feat: add mo.image_compare() | image comparison slider by @Haleshot in #5091
chore(deps): update build tools by @renovate in #5049
chore(deps): update dependency hvplot to ~=0.11.3 by @renovate in #5151
chore(deps): update dependency boto3 to >=1.38.26 by @renovate in #5150
feat: add frontend schema for redshift by @Light2Dark in #5140
feat: add redshift engine by @Light2Dark in #5132
improvement: marimo converters to/from various formats by @mscolnick in #5146
security: Create policy and thank previous reporters by @dmadisetti in #5162
feat: add reasoning tokens in chat panel and reasoning support for anthropic by @bjoaquinc in #5159
fix: add cell ids to deserialize by @mscolnick in #5165
fix: add cell ids to deserialize by @mscolnick in #5166
Add mechanism for injecting custom file stores by @pepijndevos in #5161
fix: skew potection token in run-mode when auth is enabled by @mscolnick in #5168
fix: broken CI with mac anthropic by @dmadisetti in #5173
feat: allow env level app overrides by @dmadisetti in #5172
chore: publish dev to test-pypi by @mscolnick in #5174
chore: publish dev to test-pypi by @mscolnick in #5175
fix: CI pass by @dmadisetti in #5177
fix: inline favicon by @mscolnick in #5181
Create ipynb fixtures for marimo convert and snapshot outputs by @manzt in #5179
fix(anthropic): set temperature = 1 for extended-thinking models by @bjoaquinc in #5190
feat: add ai reasoning tokens and other parts persistence between sessions by @bjoaquinc in #5191
chore: add tests for sql function by @Light2Dark in #5189
chore(convert): Move _transform_sources tests to snapshot-based tests by @manzt in #5194
Add support for initial chart properties in data_explorer (take 2) by @janosh in #5171
Use runtime assertions instead of type assertions by @manzt in #5208
Support some JupyterBook cell tags in marimo convert by @manzt in #5169
improvement: allow for different backends by @mscolnick in #5187
feat: Skip undo delete toast for empty cells by @manzt in #5209
chore: add suspense for terminal by @Light2Dark in #5211
Default to uv package manager when launched from uv by @manzt in #5213
docs (ai completion): add instructions for Ollama by @tobiasschweizer in #5212
Discover uv executable with UV environment variable by @manzt in #5215
fix: Skip PEP 723 check on directories by @manzt in #5216
Modify docs for readability and consistency by @gublit in #5222
fix: home edit mode with separated backend by @dmadisetti in #5235
fix(deps): update codemirror dependencies by @renovate in #5225
chore: update ai model list by @bjoaquinc in #5232
chore: upgrade ai backend from google-generativeai (deprecated) -> google-genai by @bjoaquinc in #5226
fix: add reasoning config only if is reasoning model by @bjoaquinc in #5221
chore: remove old feature flags by @Light2Dark in #5241
improvement: condense / cleanup static banner by @mscolnick in #5245
fix: table cell styles index error by @Light2Dark in #5253
feat: add MarkdownRenderer to ReasoningAccordion by @bjoaquinc in #5248
feat: change page size in tables directly by @Light2Dark in #5243
fix: disable charts for > max_rows without vegafusion by @Light2Dark in #5224
feat: Render mermaid-based (optimized) query plan for pl.LazyFrame by @manzt in #5247
feat: runtime config link fix by @dmadisetti in #5256
chore(google): updated mo.ui.chat to use google-genai instead of google-generativeai by @bjoaquinc in #5258
improvement: handle waiting until connection is healthy by @mscolnick in #5259
fix: don't block when writing auto-export files by @mscolnick in #5254
chore: upgrade to react 19 by @Light2Dark in #5249
fix: (outlines) Headings with the same name are highlighted multiple… by @jo-soft in #5176
docs: add numfocus affiliation by @akshayka in #5267
fix: centering/aligning of file-button by removing flex-grow by @mscolnick in #5266
style: improve page size input styles by @Light2Dark in #5264
docs: make numfocus logo smaller, add to docs homepage by @akshayka in #5268
chore: remove context provider & update types (react 19) by @Light2Dark in #5252
fix: allow authToken in mount config by @mscolnick in #5269
chore: add defaults to table args by @mscolnick in #5263
feat: Allow selecting optional "extras" for missing packages by @manzt in #5260
feat: Allow black/white list in extensions by @dmadisetti in #5271
Make async data states impossible to misrepresent in useAsyncData by @manzt in #5272
fix: types error in test by @Light2Dark in #5275
fix: handle edit message bug by @bjoaquinc in #5274
fix: add suspense to prevent screen flicker for col-explorer & datasources chart by @Light2Dark in #5273
fix: graceully handle other url protocols by @mscolnick in #5278
fix: anywidget remote url by @mscolnick in #5279
styles: diagnostics padding by @mscolnick in #5277
fix: suspense on terminal by @mscolnick in #5283
feat: enhance ImportError handling for better package suggestions by @manzt in #5281
improvement: connecting indicator and readonly tooltip by @mscolnick in #5284
fix: allow for base url redirects by @dmadisetti in #5287
docs: emphasize generate with ai by @akshayka in #5289
Fixed typo in dataflow.py (ampltitude -> amplitude) by @jogloran in #5288
readme: fix link by @akshayka in #5290
chore: biome 2x by @mscolnick in #5291
fix: snapshot by @mscolnick in #5292
Adding some extra module names by @koaning in #5295
style: don't wrap page size input when cell is too small by @Light2Dark in #5301
improvement: make our file-explorer more compatible with s3 mount by @mscolnick in #5286
fix: WS are static on creation by @dmadisetti in #5294
nit: connecting copy in the editor by @akshayka in #5305
docs: link to repo in docs by @akshayka in #5306
docs: ipynb snapshots working with expensive notebooks by @akshayka in #5307
feat: cell range selection for tables (v2) by @Light2Dark in #5296
fix: undefined errors that may crop up before kernel is fully instantiated by @dmadisetti in #5313
fix: wait for connection on more requests by @mscolnick in #5314
fix: more waiting for connection logic by @mscolnick in #5316
style: datasource icons dark mode by @Light2Dark in #5317
[pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #5315
fix: version init by @mscolnick in #5324
fix: more Supsense in more places by @mscolnick in #5325
fix: show wasm always always connected by @mscolnick in #5331
fix: merge default config on save_user_config by @mscolnick in #5330
fix: dark mode charts and json viewer crashing by @Light2Dark in #5332
fix: invalidate importlib cache after requirecheck fails by @mscolnick in #5328
Extend view-as URI parameter to handle app view in edit mode by @harterrt-shopify in #5327
chore: disable cell range selection for release by @mscolnick in #5334
tests: fix ibis datatype drift by @mscolnick in #5333
fix: reasonable session and notebook merge by @dmadisetti in #5335
fix: disable run when not connected by @mscolnick in #5342

New Contributors

@winstxnhdw made their first contribution in #5128
@killickm made their first contribution in #5149
@pepijndevos made their first contribution in #5161
@tobiasschweizer made their first contribution in #5212
@gublit made their first contribution in #5222
@jo-soft made their first contribution in #5176
@jogloran made their first contribution in #5288
@harterrt-shopify made their first contribution in #5327

Full Changelog: 0.13.15...0.14.0