diff --git a/Readme.md b/Readme.md
index 01da44eb..e006ade8 100644
--- a/Readme.md
+++ b/Readme.md
@@ -111,33 +111,33 @@ The detailed runtimes of the [benchmarks](./serde_arrow/benches/groups/) are lis
 
 | label          | time [ms] | arrow2_convert | serde_arrow | arrow |
 |----------------|-----------|----------------|-------------|-------|
-| arrow2_convert |     53.14 |           1.00 |        0.15 |  0.03 |
-| serde_arrow    |    348.85 |           6.57 |        1.00 |  0.20 |
-| arrow          |   1703.18 |          32.05 |        4.88 |  1.00 |
+| arrow2_convert |     52.28 |           1.00 |        0.21 |  0.06 |
+| serde_arrow    |    252.35 |           4.83 |        1.00 |  0.29 |
+| arrow          |    877.10 |          16.78 |        3.48 |  1.00 |
 
 ### complex_common_serialize(1000000)
 
 | label          | time [ms] | arrow2_convert | serde_arrow | arrow |
 |----------------|-----------|----------------|-------------|-------|
-| arrow2_convert |    478.85 |           1.00 |        0.18 |  0.05 |
-| serde_arrow    |   2711.26 |           5.66 |        1.00 |  0.31 |
-| arrow          |   8729.60 |          18.23 |        3.22 |  1.00 |
+| arrow2_convert |    527.58 |           1.00 |        0.22 |  0.06 |
+| serde_arrow    |   2403.99 |           4.56 |        1.00 |  0.27 |
+| arrow          |   8857.78 |          16.79 |        3.68 |  1.00 |
 
 ### primitives_serialize(100000)
 
 | label          | time [ms] | arrow2_convert | serde_arrow | arrow |
 |----------------|-----------|----------------|-------------|-------|
-| arrow2_convert |     13.64 |           1.00 |        0.19 |  0.07 |
-| serde_arrow    |     73.32 |           5.38 |        1.00 |  0.38 |
-| arrow          |    192.76 |          14.13 |        2.63 |  1.00 |
+| arrow2_convert |     13.05 |           1.00 |        0.21 |  0.06 |
+| serde_arrow    |     62.63 |           4.80 |        1.00 |  0.30 |
+| arrow          |    209.27 |          16.04 |        3.34 |  1.00 |
 
 ### primitives_serialize(1000000)
 
 | label          | time [ms] | arrow2_convert | serde_arrow | arrow |
 |----------------|-----------|----------------|-------------|-------|
-| arrow2_convert |    178.98 |           1.00 |        0.25 |  0.09 |
-| serde_arrow    |    716.76 |           4.00 |        1.00 |  0.36 |
-| arrow          |   2005.61 |          11.21 |        2.80 |  1.00 |
+| arrow2_convert |    144.58 |           1.00 |        0.24 |  0.07 |
+| serde_arrow    |    603.95 |           4.18 |        1.00 |  0.28 |
+| arrow          |   2160.02 |          14.94 |        3.58 |  1.00 |
 
 <!-- end:benchmarks -->
 
diff --git a/timings.png b/timings.png
index f409259f..a93e623a 100644
Binary files a/timings.png and b/timings.png differ
diff --git a/x.py b/x.py
index 9ee26a2f..9dc6ee51 100644
--- a/x.py
+++ b/x.py
@@ -360,7 +360,7 @@ def plot_times(mean_times):
                 ),
             ]
         )
-        .groupby("impl")
+        .group_by("impl")
         .agg(pl.col("time").mean())
         .sort("time")
     )