Document:

EX-4.5

 Exhibit 4.5 

AMENDMENT NO. 4 TO 

ONEOK, INC. 401(K) PLAN 
 (As
amended and restated effective January 1, 2014) 
 1.    Effective January 1, 2015, Paragraph 12 of Article I
of the Plan is amended in its entirety to read as follows: 
  

	 	12.	 Committee 

The ONEOK, Inc. Benefit Plan Administration Committee authorized by the Board of Directors to that is responsible for
administering the Plan in accordance with paragraph 1. of Article XV hereof. 
 2.    Effective January 1,
2015, Paragraph 1.E. of Article IX of the Plan is amended by inserting the following as a new subparagraph at the end thereof: 

Notwithstanding anything to the contrary expressed or implied herein, no member of the Committee who is a senior officer and reports
directly to the Company’s Chief Executive Officer shall be permitted to vote on the continued availability of ONEOK common stock as an investment option under the Plan. 

3.    Effective January 1, 2015, Paragraph 1 of Article XV of the Plan is amended in its entirety to read as follows:

  

	 	1.    ONEOK,	 Inc. Benefit Plan Administration Committee 

The Plan shall be administered by the ONEOK, Inc. Benefit Plan Administration Committee (the “Committee”) consisting of the
Company’s Senior Vice President, Chief Financial Officer and Treasurer, Vice President – Human Resources and Vice President – Treasury, and their respective successors in title or duties, authority and function. The Company’s
Senior Vice President, Chief Financial Officer and Treasurer shall serve as Chair of the Committee and may appoint additional members to such Committee, in his sole discretion not less than three
(3) members, who shall be appointed from time to time by the Board of Directors and shall serve at the pleasure of the Board. Each of the members of the Committee may from time to time designate an
alternate who shall have full power to act in his/her absence or inability to act. Members of the Committee may participate in the benefits under the Plan provided they are otherwise eligible to do so. Except as otherwise provided by the Board of
Directors, no member of the Committee shall receive any compensation for his/her services as such. No bond or other security shall be required of any member of the Committee in such capacity in any jurisdiction. In the absence of the Chairman of the
Committee, the alternate designated by the Chairman shall preside at the meetings of the Committee. The Committee shall serve as the plan administrator within the meaning of Section 3(16)(A) of ERISA. 

4.    Effective January 1, 2015, Paragraph 2 of Article XV of the Plan is amended in its entirety to read as follows:

  

	 	2.    Trust,	 Trustee and Committee 

The Company and Fidelity Management Trust Company, N.A., have entered into a Trust Agreement pursuant to which the Fidelity Management Trust
Company is to act as Trustee under the Plan. The Company may, without further reference to or action by any Employee, Participant, or any subsidiary of the Company participating in the Plan, (a) from time to time enter into such further
agreements with the Trustee or other parties, and make such amendments to said Trust Agreement or such further agreements, as the Company may deem necessary or desirable to carry out the Plan; (b) from time to time designate successor Trustees
which in each case shall be a bank or trust company having capital and surplus of not less than five hundred million dollars ($500,000,000); and (c) from time to time take such other steps and execute such other instruments as the Company may
deem necessary or desirable to put the Plan into effect or to carry it out. The Board ONEOK, Inc. Benefit Plan Sponsor Committee shall determine the manner in which the Company shall take any such action. Moreover, the
Committee may execute such further agreements with the Trustee or other parties as it reasonably deems necessary to fulfill its own obligations with respect to administration of the Plan. 

 The Committee shall advise the Trustee in writing with respect to all benefits which become
payable under the terms of the Plan and shall direct the Trustee to pay such benefits from the respective Participants’ Accounts. The Committee shall have such other powers and duties as are specified in this instrument as the same may from
time to time be constituted, and not in limitation but in amplification of the foregoing, the Committee shall have power, to the exclusion of all other persons, in its sole discretion discretionary
authority, to make all determinations and interpretations with respect to administration of the Plan, to interpret or construe the provisions of this instrument and to determine all questions that may arise hereunder as to the
status and rights of Participants and others hereunder, to decide any disputes which may arise hereunder; to construe and determine the effect of beneficiary designations; to determine all questions that shall arise under the Plan, including
questions as to the rights of Employees to become Participants, as to the rights of Participants, and including questions submitted by the Trustee on all matters necessary for it properly to discharge its duties, powers, and obligations; to employ
legal counsel, accountants, actuaries, consultants and agents; to establish and modify such rules and regulations and prescribe forms for carrying out the provisions of the Plan not inconsistent with the terms and provisions hereof, as the
Committee may consider proper and desirable; to open, close and manage accounts at one or more commercial banks, investment banks, trust companies, broker-dealers, investment advisers, investment managers, registered investment companies,
investment funds and other financial institutions; to deposit and withdraw money, securities or other property in and from such accounts and provide written or oral instructions with respect to the administration and management of such accounts; to
make, sign, furnish, deliver or file reports, returns, forms or other instruments with respect to, on behalf of or for the Plan or Trustee; and in all things and respects whatsoever, without limitation, to direct the administration of the Plan
and Trust with the Trustee being subject to the direction of the Committee. The Committee shall establish and maintain reasonable procedures governing the filing of benefit claims, notification of benefit determinations and appeal of adverse benefit
determinations, as described in and consistent with paragraph 7. of this Article XV, below, and which shall also be described in the summary plan description for the Plan. The Committee may supply any omission or reconcile any inconsistency in this
instrument in such manner and to such extent as it shall deem expedient to carry the same into effect and it shall be the sole and final judge of such expediency. The Committee may adopt such regulations with respect to the signature by an Employee,
Participant and/or the spouse of an Employee or Participant to any directions or other papers to be signed by Employees or Participants and similar matters as the Committee shall determine in view of the laws of any state or states. 

5.    Effective January 1, 2015, Paragraph 3 of Article XV of the Plan is amended in its entirety to read as follows:

  

	 	3.    Allocation	 of Plan Fiduciaries Fiduciary and Settlor
Responsibilities 

 The administrator (within the meaning of Section 3(16)(A) of ERISA)
and named fiduciary of the Plan (within the meaning of Section 402 of ERISA), who shall have authority to control and manage the operation and administration of the Plan, is the Committee. The Fiduciary may serve in more than one
(1) fiduciary capacity under the Plan. It may employ one (1) or more persons to render advice to it. It may delegate ministerial functions to any person or persons. The Trustee and the Company may by agreement in writing arrange for the
delegation by the Trustee to the Committee of any of the Trustee’s functions except the custody of the assets, the voting with respect to shares held by the Trustee, and the purchase and sale or redemption of securities. Any appointment of an
additional or replacement named fiduciary in accordance with this paragraph will be subject to advance approval of the Board of Directors of the Company. 

Except for those authorities and responsibilities which are expressly reserved to the Board of Directors herein, the ONEOK, Inc. Benefit
Plan Sponsor Committee shall possess and exercise all non-fiduciary “settlor” authority to act on behalf of the Company with respect to the Plan. The ONEOK, Inc. Benefit Plan Sponsor Committee shall
consist of the Company’s President and Chief Executive Officer; Executive Vice President and Chief Administrative Officer; Senior Vice President, Chief Financial Officer and Treasurer; Senior Vice President, General Counsel and Assistant
Secretary; Senior Vice President – Market Analysis; Vice President – Human Resources; Vice President, Secretary and Associate General Counsel; and their respective successors in title or duties, authority and function. 

 6.    Effective January 1, 2015, Paragraph 1 of Article XXIV of the
Plan is amended in its entirety to read as follows: 
  

	 	1.    Amendment	 and Termination of Plan 

The Company hopes and expects to continue the Plan indefinitely. However, the right to amend, modify or terminate the Plan is necessarily
reserved by the Company. The amendment or modification of the Plan may be made by the Chief Executive Officer of the Company, upon approval by the ONEOK, Inc. Benefit Plan Administration Sponsor
Committee, executing or approving a written instrument containing such amendment or modification as he it deems necessary or advisable (pursuant to authority which has been duly delegated
to him by the Board and is hereby acknowledged and recognized); provided, that no amendment or modification of the Plan which would increase the benefits provided to Participants or increase contributions required to be made by the Company
under the Plan, or to terminate the Plan, shall be made unless such amendment or modification is authorized pursuant to a resolution adopted by the Board of Directors.EX-4.6

 Exhibit 4.6 

AMENDMENT NO. 5 TO 

ONEOK, INC. 401(K) PLAN 
 (As
amended and restated effective January 1, 2014) 
 1.    Effective January 1, 2015, Paragraph 15.A. of Article
I of the Plan is amended in its entirety as follows: 
 A.    Non-Bargaining
Unit Participants. The total annual base salary plus any lump sum merit pay and promotion awards, gainshare awards, cash incentive compensation, commissions, overtime pay, and shift differentials paid to a Participant by the Company, but
excluding amounts deferred contributed credited by the Company or deferred by the Participant under a plan of deferred compensation to the extent that such notional contributions or deferrals
are not includible in gross income of the Participant for the taxable year in which notionally contributed or deferred. Provided, that any reduction in salary elected and deferred by the Participant under the cash or
deferred arrangement of Article III of the Plan, any deferred compensation plan or under Code Sections 125, 132(f)(4), 402(e)(8) and 457 pursuant to the employee benefit plans of the Company shall be included in determining compensation
hereunder. For purposes of this definition incentive compensation shall be treated as paid to a Participant at the time of actual payment. Provided, further, that the annual compensation of each Participant taken into account under this Plan for any
year shall not exceed two hundred sixty thousand dollars ($260,000) in the years beginning after December 31, 2013, (such two hundred sixty thousand dollars ($260,000) amount to be adjusted to reflect increases in the cost-of-living in accordance with Code Sections 401(a)(17) and 415(d)). The cost-of-living
adjustment in effect for a calendar year applies to any period, not exceeding 12 months, over which compensation is determined (determination period) beginning in such calendar year. Provided, further, that the annual compensation of each
Participant taken into account under Plan shall not exceed $260,000 and such $260,000 amount shall be adjusted to reflect increases in the cost-of-living in accordance
with Code Sections 401(a)(17) and 415(d). 
 2.    Effective January 1, 2016, the first subparagraph within
Paragraph 2.A. of Article III of the Plan is amended in its entirety as follows: 
 1.    Each Employee who is a Non-Bargaining Unit Participant in this Plan may elect a Reduction in Compensation in an amount not in excess of fifty percent (50%) of his/her Compensation (but without giving effect to the limits set forth in
Section 401(a)(17) of the Code) or the limitation on exclusion of elective deferrals for his/her taxable year, provided in Code Section 402(g), subject to applicable
cost-of-living adjustment thereunder, or as provided in any successor provision of the federal tax law. 

3.    Effective January 1, 2015, the third subparagraph within Paragraph 9.A. of Article III of the Plan is amended
in its entirety as follows: 
 3.    The Automatic Elective Deferrals made on behalf of Participants shall not be Roth
Elective Deferrals; provided, however, that each Participant with a Roth Elective Deferral of at least 1% but no more than 5% as of January 1, 2015 shall have his or her Roth Elective Deferral automatically increased to 6% on
January 1, 2015. 
 4.    Effective January 1, 2015, the first subparagraph within Paragraph
9.E. of Article III of the Plan is amended in its entirety as follows: 
 1.    No later than 90 days after Automatic
Elective Deferrals are first withheld from a Participant’s pay, the Participant may request a taxable distribution of his or her Automatic Elective Deferrals. Spousal consent is not required for any such withdrawal of Automatic Elective
Deferrals. This withdrawal right is not available to Participants whose existing Reduction in Compensation or Roth Elective Deferral of at least 1% but no more than 5% is increased to 6% on January 1, 2015. 

 5.    Effective January 1, 2015, the first subparagraph within
Paragraph 1.A. of Article VII of the Plan is amended in its entirety as follows: 
 1.    The Company shall make a
Matching Contribution for each Non-Bargaining Unit Participant which shall be equal to the Company’s 401(k) Contribution for such Participant based upon such Participant’s elected Reduction in
Compensation and deferral for that month, subject to the limitation stated in clause (3) of this subparagraph 1.A., below; provided, that the Company shall not make any Matching Contribution for such a
Non-Bargaining Unit Participant with respect to that part of the Company’s 401(k) Contribution that is either an ESOP Dividend Distribution/Additional Deferral Contribution or a Catch-Up Contribution made for such Participant. 
 6.    Effective
January 1, 2015, the fourth subparagraph within Paragraph 1.A. of Article VII of the Plan is amended in its entirety as follows: 

4.    A full Matching Contribution shall be made for a Participant whose 401(k) Contributions equal the deferral limitation
under Code Section 402(g) prior to the Plan limit on Matching Contributions being reached for the Plan Year. If the Company’s 401(k) Contributions based upon a Participant’s elected Reduction in Compensation equal the Code
Section 402(g) limitation at any time during a Plan Year, and when such limitation is reached no further Company 401(k) Contributions or After-Tax Deposits are made for or by such Participant for that
Plan Year, and the amount of Matching Contributions made for the Plan Year is then less than the Maximum Matching Contribution Amount, the Company shall thereafter make one or more monthly Matching Contributions for the Participant in that Plan Year
until the total Matching Contributions made for the Participant for that Plan Year equal such Maximum Matching Contribution Amount. For purposes of this subparagraph A.4, the term “Maximum Matching Contribution Amount” shall mean the
lesser of (i) the total amount of the Company’s 401(k) Contributions for the Participant and the Participant’s After-Tax Contributions for that Plan Year, or (ii) six percent (6%) of the
total of the Participant’s monthly compensation for all months in that Plan Year. 
 Notwithstanding the above, there shall be
no Matching Contributions with respect to Catch-up Contributions. 

7.    Effective January 1, 2015, Paragraph 1.I. of Article IX of the Plan is removed in its entirety, and Paragraph
10.F of Article IX of the Plan is amended by inserting the following as a new subparagraph at the end thereof: 

7.    This paragraph 10 supersedes any conflicting provisions in former paragraph 1.I of this Article IX, which provisions
shall be given no effect. 
 8.    Effective January 1, 2016, Paragraph 3 of Article XI of the Plan is amended in
its entirety as follows: 
 Except as provided in paragraph 6. of this Article XI, below, when a Participant dies or his/her employment with
the Company is terminated by retirement or for any other reason (except transfer of employment to a subsidiary of the Company participating in the Plan), the account of such Participant under the Plan will be completely liquidated, and the entire
balance of the account will be distributed in a single payment to the Participant, or his/her surviving spouse, beneficiaries or legatees, or heirs, respectively, whichever is entitled thereto. The determination of the distributee or distributees in
the event of a Participant’s death shall be made in accordance with Article XIII of the Plan. Every distribution on death of a Participant shall be an immediate distribution by a single payment of the entire account. Subject to any more
restrictive requirements in paragraph 11, below, Itit is intended by this paragraph 3. that distribution of the entire balance in the account of a Participant is to be made as soon
as reasonably practicable after the death of a Participant, or termination of employment by retirement or for any other reason and in no event shall distribution by reason of the Participant’s death be made later than five (5) years after
the death of the Participant; provided, that if the Participant’s account exceeds five thousand dollars ($5,000), it shall not be immediately distributed until the Participant attains age sixty-five (65) (which shall be considered the normal
retirement age under the Plan and Code Section 411(a)(8)) without the written consent of the 

 
Participant; but no consent to immediate distribution shall be required in the event of the death of a Participant, and such requirement of consent shall not give a Participant a right to any
form or method of payment of his/her account, and his/her account shall be maintained and distributed thereafter only in accordance with the rights to, and sequence of requested distribution stated in paragraphs 7. and 9. of this Article XI, below.
Any such undistributed balance of the Participant’s account shall be distributed upon his/her attaining age sixty-five (65); provided that a Participant, who has separated from employment with the Company by retirement or for any reason other
than death, may make the affirmative election to defer distribution of his/her account beyond age sixty-five (65) pursuant to paragraph 6. of this Article XI, below. 

9.    Effective January 1, 2016, subparagraph 2(b)(ii) of Paragraph 11.D. of Article XI of the Plan is amended in its
entirety to read as follows: 
 (ii)    If the Participant dies before the distribution of the Participant’s
interest has begun in accordance with Paragraph 11.D.2.b.(1), above, the entire interest of the Participant shall be distributed in the manner and form provided for under the Plan in such event, but no case later than: 

(1)within 5 years after the death of such Participant, or 

(2)If any portion of the Participant’s interest is payable to (or for the benefit of) a Designated Beneficiary
pursuant to the provisions of the Plan, such portion shall be distributed (in accordance with Treasury regulations under Code Section 401(a)(9)) over the life of such Designated Beneficiary (or over a period
not extending beyond the Life Expectancy of such Designated Beneficiary), and such distributions shall begin not later than one (1) year after the Participant’s death or such later date as is prescribed in
the Treasury regulations under Code Section 401(a)(9). 

10.    Effective January 1, 2015, Paragraph 3 of Article XII of the Plan is amended in its entirety as follows: 

In the event a Participant makes a withdrawal of After-Tax Deposits in his/her Plan Account pursuant to
paragraph 2., above, such Participant shall not be entitled to Company Matching Contributions otherwise required to be made under the Plan until the first of the next month following the expiration of six (6) months from the date of such
withdrawal by such Participant. Provided, such suspension of Company Matching Contributions shall not apply to withdrawal of any After-Tax Deposits that were made by a Participant to the Plan prior to
January 1, 1987, or to any withdrawals after age fifty-nine and one-half
(591⁄2) pursuant to Paragraph 7 below. This suspension and abatement of the Participant’s right to receive Company
Matching Contributions shall not affect the Participant’s right to elect a Reduction in Compensation or make After-Tax Deposits to the extent otherwise permissible under the Plan. 

11.    Effective January 1, 2015, the second non-numbered subparagraph within
Paragraph 3 of Article XV of the Plan is amended in its entirety as follows: 
 Except for those authorities and responsibilities which are
expressly reserved to the Board of Directors herein, the ONEOK, Inc. Benefit Plan Sponsor Committee shall possess and exercise all non-fiduciary “settlor” authority to act on behalf of the Company
with respect to the Plan. The ONEOK, Inc. Benefit Plan Sponsor Committee shall consist of the Company’s President and Chief Executive Officer; Executive Vice President and Chief Administrative Officer; Senior Vice President, Chief Financial
Officer and Treasurer; Senior Vice President, General Counsel and Assistant Secretary; Senior Executive Vice President – Market Analysis Strategic Planning and Corporate Affairs; Vice President
– Human Resources; Vice President, Secretary and Associate General Counsel; and their respective successors in title or duties, authority and function. 

 12.    Effective January 1, 2015, the fifth non-numbered subparagraph within Paragraph 7 of Article XV of the Plan is amended in its entirety as follows: 

By participating in the Plan, each Participant is deemed to have waived any right to participate in any class action or accept any form of
personal recovery (equitable, monetary or otherwise) therefrom. Any legal proceeding filed by any Participant in connection with the Plan may only be filed in the United States District Court for the Eastern District of Oklahoma, located in
Tulsa, Oklahoma. Moreover, each Participant shall be deemed to have agreed to participate in binding arbitration or such other means of alternate dispute resolution as the Company or the Committee may require from time to time. 

13.    Effective January 1, 2015, Article XV of the Plan is amended by inserting the following as new paragraphs at
the end thereof: 
 15.    Overpayments 

Whenever a payment is made by the Plan that is more than the benefit to which any Participant, beneficiary, alternate payee or other person
is entitled under the Plan or applicable law, whether due to a mistake of fact or any other reason, an equitable lien by agreement shall be imposed on such excess payment and the Plan will have an unrestricted right to recover the cumulative amount
of all such excess payments. If the recipient does not repay the overpaid amount promptly upon request, the Plan or the Company may withhold or offset future amounts, sue to recover such amounts or use any other lawful remedy to recoup any such
amounts. In addition, the recipient may be required to reimburse the Company for any liability the Company incurs due to any failure to withhold, remit and report applicable taxes with respect to any such overpayment. If the Company, the Plan or any
Plan fiduciary commences a legal proceeding to recover an overpayment, the recipient (including any third party who is holding any funds attributable to the overpayment) will be required to reimburse such entity for reasonable attorneys’ and
other professional fees, court costs, disbursements and any other expenses incurred in attempting to collect the overpayment. 

16.    Unclaimed Benefits 

If the Plan is unable to make payment to any Participant, beneficiary, alternate payee or other person to whom a payment is due under the
Plan because it cannot ascertain the identity or location of such person after making reasonable, good faith efforts, then the Plan Administrator may take such actions as it deems necessary and advisable, including but not limited to use of a
third-party locator service, transferring such amounts to an IRA for the recipient’s benefit, forfeiture, freezing the Plan account, payment of Plan administration expenses or escheat under applicable state law. The cost of such actions and any
resulting taxes, penalties and related costs (including reasonable attorneys’ fees) shall be borne by the payee to the maximum extent permitted by law.

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