Missing trapz in Numpy 2.4.1

[hawkbren]

Numpy 2.4.1 does not have trapz
AttributeError: module 'numpy' has no attribute 'trapz'. Did you mean: 'trace'?

To Reproduce
Built new conda environment with numpy 2.4.1 and all dependencies

mamba install numpy=2.4.1

(C:\BITrusted\test) C:\Users\hawkbren>mamba env export -n test
name: test
channels:

• conda-forge
  dependencies:
• bzip2=1.0.8=h0ad9c76_8
• ca-certificates=2026.1.4=h4c7d964_0
• icu=78.2=h637d24d_0
• libblas=3.11.0=5_hf2e6a31_mkl
• libcblas=3.11.0=5_h2a3cdd5_mkl
• libexpat=2.7.3=hac47afa_0
• libffi=3.5.2=h3d046cb_0
• libhwloc=2.12.2=default_h4379cf1_1000
• libiconv=1.18=hc1393d2_2
• liblapack=3.11.0=5_hf9ab0e9_mkl
• liblzma=5.8.2=hfd05255_0
• libmpdec=4.0.0=hfd05255_1
• libsqlite=3.51.2=hf5d6505_0
• libwinpthread=12.0.0.r4.gg4f2fc60ca=h57928b3_10
• libxml2=2.15.1=h779ef1b_1
• libxml2-16=2.15.1=h3cfd58e_1
• libzlib=1.3.1=h2466b09_2
• llvm-openmp=21.1.8=h4fa8253_0
• mkl=2025.3.0=hac47afa_455
• numpy=2.4.1=py314h06c3c77_0
• openssl=3.6.1=hf411b9b_1
• pip=26.0=pyh145f28c_0
• python=3.14.2=h4b44e0e_101_cp314
• python_abi=3.14=8_cp314
• tbb=2022.3.0=h3155e25_2
• tk=8.6.13=h6ed50ae_3
• tzdata=2025c=hc9c84f9_1
• ucrt=10.0.26100.0=h57928b3_0
• vc=14.3=h41ae7f8_34
• vc14_runtime=14.44.35208=h818238b_34
• vcomp14=14.44.35208=h818238b_34
• zstd=1.5.7=h534d264_6
  prefix: C:\BITrusted\test

Started python
import numpy as np
np.trapz()
AttributeError: module 'numpy' has no attribute 'trapz'. Did you mean: 'trace'?

Expected behaviour
It should have a description of the needed input parameters.

Screenshots

System Specifications

• OS: Windows (WindowsPE 64bit)

• Python: 3.14.2

• NeuroKit2: 0.2.10

• NumPy: 2.4.1

• Pandas: 3.0.0

• SciPy: 1.17.0

• sklearn: 1.8.0

• matplotlib: 3.10.8

(base) PS C:\Users\hawkbren> Get-ComputerInfo (with redactions)

CsProcessors                                            : {AMD Ryzen Threadripper PRO 5955WX 16-Cores     }
CsSystemFamily                                          : ThinkStation P620
CsSystemType                                            : x64-based PC
OsName                                                  : Microsoft Windows 11 Enterprise
OsVersion                                               : 10.0.22631
OsBuildNumber                                           : 22631
OsHotFixes                                              : {KB5066133, KB5027397, KB5073455, KB5071963}
OsBuildType                                             : Multiprocessor Free
OsTotalVisibleMemorySize                                : 268282908
OsFreePhysicalMemory                                    : 222484548
OsArchitecture                                          : 64-bit

Nvidia RTX A5000

[DerAndereJohannes]

Hi hawkbren,

Thank you for your issue. the trapz function in numpy was removed in version 2.4. This is already fixed in dev and will be available in the next version which should be out soon.

In the meantime, please install a numpy version < 2.4, I.e., pip install numpy<2.4

See #1155 for additional details.

Let me know if you need anything else.

[hawkbren]

Thank you so much for that info and for getting to my issue so fast. I will get my environments changed. Brenden Hawk Scientist IV, Antibody Therapeutics Lead Boehringer Ingelheim Animal Health USA Inc. 2412 South Loop Drive | Ames, IA 50010 T +1 (515) 268-7424<tel:+1%20(515)%20268-7424> E ***@***.******@***.***> [www.boehringer-ingelheim.com/us/]<https://www.boehringer-ingelheim.com/us/> This e-mail is confidential and may also be legally privileged. If you are not the intended recipient please reply to sender, delete the e-mail and do not disclose its contents to any person. Any unauthorized review, use, disclosure, copying or distribution is strictly prohibited.

…

________________________________ From: Johannes Herforth ***@***.***> Sent: Wednesday, February 4, 2026 1:13 PM To: neuropsychology/NeuroKit ***@***.***> Cc: Hawk,Brenden (AH GI Res) BIAH-US-J ***@***.***>; Author ***@***.***> Subject: Re: [neuropsychology/NeuroKit] Missing trapz in Numpy 2.4.1 (Issue #1159) You don't often get email from ***@***.*** Learn why this is important<https://aka.ms/LearnAboutSenderIdentification> CAUTION: Do not click links, scan QR codes, or open attachments unless you trust the sender; this email is from an external sender (outside Boehringer Ingelheim). [https://avatars.githubusercontent.com/u/25019880?s=20&v=4]DerAndereJohannes left a comment (neuropsychology/NeuroKit#1159)<#1159 (comment)> Hi hawkbren, Thank you for your issue. the trapz function in numpy was removed in version 2.4. This is already fixed in dev and will be available in the next version which should be out soon. In the meantime, please install a numpy version < 2.4, I.e., pip install numpy<2.4 See #1155<#1155> for additional details. Let me know if you need anything else. — Reply to this email directly, view it on GitHub<#1159 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BGVDQSOW2K7H3USJO2BXVNT4KJAG5AVCNFSM6AAAAACT7KJAY2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTQNBZGAZTCMJYGA>. You are receiving this because you authored the thread.Message ID: ***@***.***>