diff --git a/.gitignore b/.gitignore
index 5dcd94921..1ddcc9d7f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,4 +10,5 @@ bin/
 .vscode
 *.node
 docs/
-run.js
\ No newline at end of file
+run.js
+.yarn/install-state.gz
\ No newline at end of file
diff --git a/Cargo.toml b/Cargo.toml
index 4937efd8f..9e7f61de5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ ahash = "0.7"
 bincode = "1.3"
 napi = { version = "2.2.0", default-features = false, features = ["napi8", "serde-json", "experimental"] }
 napi-derive = { version = "2.2.0", default-features = false }
-polars-core = { git = "https://github.com/pola-rs/polars.git", rev = "95074d91cfa0248a86722fbae572952425ae43cb", default-features = false }
+polars-core = { git = "https://github.com/pola-rs/polars.git", rev = "9b3560471b7dae1ef295172bd1c78635d3c773a9", default-features = false }
 thiserror = "1.0.20"
 
 serde_json = { version = "1" }
@@ -88,7 +88,7 @@ features = [
   "arg_where",
 ]
 git = "https://github.com/pola-rs/polars.git" 
-rev = "95074d91cfa0248a86722fbae572952425ae43cb"
+rev = "9b3560471b7dae1ef295172bd1c78635d3c773a9"
 
 [build-dependencies]
 napi-build = "1.2.1"
diff --git a/__tests__/expr.test.ts b/__tests__/expr.test.ts
index 739587684..4a6e71ba1 100644
--- a/__tests__/expr.test.ts
+++ b/__tests__/expr.test.ts
@@ -707,7 +707,7 @@ describe("expr", () => {
     const df = pl.DataFrame({ a: [1, 2, 3, 3] });
     const expected = pl.DataFrame({
       "skew:bias=true": ["-0.49338220021815865"],
-      "skew:bias=false": ["-0.8545630383279711"],
+      "skew:bias=false": ["-0.8545630383279712"],
     });
     const actual = df.select(
       col("a")
@@ -1574,7 +1574,7 @@ describe("expr.dt", () => {
       hour: pl.Series("", [1], pl.UInt32),
       day: pl.Series("", [8], pl.UInt32),
       ordinalDay: pl.Series("", [8], pl.UInt32),
-      weekday: pl.Series("", [7], pl.UInt32),
+      weekday: pl.Series("", [6], pl.UInt32),
       week: pl.Series("", [1], pl.UInt32),
       month: pl.Series("", [1], pl.UInt32),
       year: pl.Series("", [1984], pl.Int32),
diff --git a/src/dataframe.rs b/src/dataframe.rs
index b56ca5840..fac9dae5e 100644
--- a/src/dataframe.rs
+++ b/src/dataframe.rs
@@ -971,12 +971,14 @@ impl JsDataFrame {
         self.df.mean().into()
     }
     #[napi]
-    pub fn std(&self) -> JsDataFrame {
-        self.df.std().into()
+    pub fn std(&self, ddof: Option<u8>) -> JsDataFrame {
+        let ddof = ddof.unwrap_or(1);
+        self.df.std(ddof).into()
     }
     #[napi]
-    pub fn var(&self) -> JsDataFrame {
-        self.df.var().into()
+    pub fn var(&self, ddof: Option<u8>) -> JsDataFrame {
+        let ddof = ddof.unwrap_or(1);
+        self.df.var(ddof).into()
     }
     #[napi]
     pub fn median(&self) -> JsDataFrame {
@@ -1493,8 +1495,6 @@ fn finish_groupby(gb: GroupBy, agg: &str) -> napi::Result<JsDataFrame> {
         "median" => gb.median(),
         "agg_list" => gb.agg_list(),
         "groups" => gb.groups(),
-        "std" => gb.std(),
-        "var" => gb.var(),
         a => Err(PolarsError::ComputeError(
             format!("agg fn {} does not exists", a).into(),
         )),
diff --git a/src/lazy/dataframe.rs b/src/lazy/dataframe.rs
index 34df6b73f..abedf47f9 100644
--- a/src/lazy/dataframe.rs
+++ b/src/lazy/dataframe.rs
@@ -427,15 +427,17 @@ impl JsLazyFrame {
     }
 
     #[napi]
-    pub fn std(&self) -> JsLazyFrame {
+    pub fn std(&self, ddof: Option<u8>) -> JsLazyFrame {
+        let ddof = ddof.unwrap_or(1);
         let ldf = self.ldf.clone();
-        ldf.std().into()
+        ldf.std(ddof).into()
     }
 
     #[napi]
-    pub fn var(&self) -> JsLazyFrame {
+    pub fn var(&self, ddof: Option<u8>) -> JsLazyFrame {
+        let ddof = ddof.unwrap_or(1);
         let ldf = self.ldf.clone();
-        ldf.var().into()
+        ldf.var(ddof).into()
     }
 
     #[napi]
@@ -650,6 +652,7 @@ pub struct ScanIPCOptions {
     pub cache: Option<bool>,
     pub rechunk: Option<bool>,
     pub row_count: Option<JsRowCount>,
+    pub memmap: Option<bool>,
 }
 
 #[napi]
@@ -657,12 +660,14 @@ pub fn scan_ipc(path: String, options: ScanIPCOptions) -> napi::Result<JsLazyFra
     let n_rows = options.n_rows.map(|i| i as usize);
     let cache = options.cache.unwrap_or(true);
     let rechunk = options.rechunk.unwrap_or(false);
+    let memmap = options.memmap.unwrap_or(true);
     let row_count: Option<RowCount> = options.row_count.map(|rc| rc.into());
     let args = ScanArgsIpc {
         n_rows,
         cache,
         rechunk,
         row_count,
+        memmap
     };
     let lf = LazyFrame::scan_ipc(path, args).map_err(JsPolarsErr::from)?;
     Ok(lf.into())
diff --git a/src/lazy/dsl.rs b/src/lazy/dsl.rs
index ff5a12791..a91d2c7ed 100644
--- a/src/lazy/dsl.rs
+++ b/src/lazy/dsl.rs
@@ -391,13 +391,15 @@ impl JsExpr {
     }
 
     #[napi]
-    pub fn std(&self) -> JsExpr {
-        self.clone().inner.std().into()
+    pub fn std(&self, ddof: Option<u8>) -> JsExpr {
+        let ddof = ddof.unwrap_or(1);
+        self.clone().inner.std(ddof).into()
     }
 
     #[napi]
-    pub fn var(&self) -> JsExpr {
-        self.clone().inner.var().into()
+    pub fn var(&self, ddof: Option<u8>) -> JsExpr {
+        let ddof = ddof.unwrap_or(1);
+        self.clone().inner.var(ddof).into()
     }
     #[napi]
     pub fn is_unique(&self) -> JsExpr {
@@ -1406,13 +1408,15 @@ pub fn arange(low: Wrap<Expr>, high: Wrap<Expr>, step: Option<i64>) -> JsExpr {
 }
 
 #[napi]
-pub fn pearson_corr(a: Wrap<Expr>, b: Wrap<Expr>) -> JsExpr {
-    polars::lazy::dsl::pearson_corr(a.0, b.0).into()
+pub fn pearson_corr(a: Wrap<Expr>, b: Wrap<Expr>, ddof: Option<u8>) -> JsExpr {
+    let ddof = ddof.unwrap_or(1);
+    polars::lazy::dsl::pearson_corr(a.0, b.0, ddof).into()
 }
 
 #[napi]
-pub fn spearman_rank_corr(a: Wrap<Expr>, b: Wrap<Expr>) -> JsExpr {
-    polars::lazy::dsl::spearman_rank_corr(a.0, b.0).into()
+pub fn spearman_rank_corr(a: Wrap<Expr>, b: Wrap<Expr>, ddof: Option<u8>) -> JsExpr {
+    let ddof = ddof.unwrap_or(1);
+    polars::lazy::dsl::spearman_rank_corr(a.0, b.0, ddof).into()
 }
 
 #[napi]