Exhibit 4.2

TENTH AMENDING AGREEMENTto the Credit Agreement dated as of November 28, 2000, as amended by a First Amending Agreement dated January 5, 2001, a Second Amending Agreement dated as of
June 29, 2001, a Third Amending Agreement dated as of December 21, 2001, a Fourth Amending Agreement dated as of December 23, 2002, a Fifth Amending Agreement dated as of March 24, 2003, a Sixth Amending Agreement dated as of
October 8, 2003, a Seventh Amending Agreement dated as of November 19, 2004, an Eighth Amending Agreement dated as of March 6, 2008, and a Ninth Amending Agreement dated as of April 7, 2008, entered into in the City of Montreal,
Province of Quebec, as of November 13, 2009 (the Agreement).



|       |  |                                                                                                                                                                                                                                                      
|------ |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|AMONG: |  | VIDÉOTRON LTÉE, a company constituted in accordance with the laws of Quebec, having its registered office at 300 Viger Street East, 6thfloor, in the City of Montreal, Province of Quebec
(hereinafter called the Borrower)                        
|       | 
|       |  | PARTY OF THE FIRST PART                                                                                                                                                                                                                              
|       | 
|AND:   |  | THE LENDERS, AS DEFINED IN THE ORIGINAL CREDIT AGREEMENT (theLenders)                                                                                                                                                                              
|       | 
|       |  | PARTIES OF THE SECOND PART                                                                                                                                                                                                                           
|       | 
|AND:   |  | ROYAL BANK OF CANADA, AS ADMINISTRATIVE AGENT FOR THE LENDERS, a Canadian bank, having a place of business at 200 Bay Street, 12th floor, South Tower,
Royal Bank Plaza, in the City of Toronto, Province of Ontario (hereinafter called the Agent)
|       | 
|       |  | PARTY OF THE THIRD PART                                                                                                                                                                                                                              
|       | 
|AND:   |  | HSBC BANK PLC, AS FINNVERA FACILITY AGENT, a bank governed by the laws of England and Wales, having a place of business at 8 Canada Square, Canary
Wharf, London, UK, E14 5HQ (hereinafter called the Finnvera Facility Agent)                     
|       | 
|       |  | PARTY OF THE FOURTH PART                                                                                                                                                                                                                             
|       | 
|AND:   |  | THE FINNVERA FACILITY LENDERS, AS DEFINED IN THE CREDIT AGREEMENT  PARTY OF THE FIFTH PART                                                                                                                                                           



---

WHEREAS the parties hereto are parties to a Credit Agreement dated as
of November 28, 2000, as amended by a First Amending Agreement dated January 5, 2001, a Second Amending Agreement dated as of June 29, 2001, a Third Amending Agreement dated as of December 21, 2001, a Fourth Amending Agreement
dated as of December 23, 2002, a Fifth Amending Agreement dated as of March 24, 2003, a Sixth Amending Agreement dated as of October 8, 2003, a Seventh Amending Agreement dated as of November 19, 2004, an Eighth Amending
Agreement dated as of March 6, 2008, and a Ninth Amending Agreement dated as of April 7, 2008 (as so amended and amended and restated, the Original Credit Agreement and as further amended pursuant to this Agreement, the
Credit Agreement);

WHEREAS the Borrower has requested certain amendments to the
Original Credit Agreement in connection with the addition of a new Finnvera Term Facility, as well as other modifications; and

WHEREASthe parties hereto wish to amend and restate the Original Credit Agreement, as amended pursuant to this Tenth Amending Agreement, in its entirety, the whole without novation;

WHEREAS the requisite majority of Lenders has agreed with the Borrower to the amendments contemplated hereby, and as
such, the Lenders have complied with the provisions of Section 18.14 and 18.15 of the Original Credit Agreement, as evidenced by the signature of each Lender and of the Agent on this Agreement;

NOW THEREFORE, THE PARTIES HERETO AGREE AS FOLLOWS:



|I. | INTERPRETATION
|-- | --------------

1. All of the words and expressions which are capitalized herein shall have the meanings ascribed to them in the Original Credit Agreement unless otherwise indicated herein.

2. The parties have agreed to indicate the amendments to the Original Credit Agreement by showing all (a) additions, by using
double-underlined text, and (b) deletions, by striking out the deleted text.

3. HSBC Bank plc is hereby appointed as the
Finnvera Facility Agent in accordance with the provisions of Schedule P to the Credit Agreement.



|II. | AMENDMENTS
|--- | ----------

All amendments are shown on the Amended and Restated Credit Agreement attached as Schedule 1. A clean, unmarked version of the Amended and Restated Credit Agreement is also attached as Schedule 2,
which clean version will become the Credit Agreement once all conditions precedent hereunder and in Schedule P of the Credit Agreement have been met.



2.



---

|III. | EFFECTIVE DATE AND CONDITIONS
|---- | -----------------------------

1. This Agreement shall become effective as of November 13, 2009 (the Effective Date), subject to the fulfilment of all conditions precedent set out herein and in Section 6.1
of Schedule P of the Credit Agreement.

2. On the Effective Date, the new Credit Agreement shall supersede
the Original Credit Agreement in its entirety, except as provided in this section. The parties hereto agree that the changes to the terms and conditions of the Original Credit Agreement set out herein and the execution hereof shall
not constitute novation and all the Security shall continue to apply to the Original Credit Agreement, as amended and restated by the Credit Agreement, and all other obligations secured thereby. Without limiting the generality of the foregoing
and to the extent necessary, (i) the Lenders, the Agent and the Finnvera Facility Agent reserve all of their rights under each of the Security Documents, and (ii) each of the Borrower and the Guarantors obligates itself again in respect of
all present and future obligations under, inter alia, the Credit Agreement.

3. The Borrower shall pay all fees and
costs, including (a) the fees referred to in the Borrowers request letter dated January 29, 2009, and (b) legal fees associated with this Agreement incurred by the Agent and the Finnvera Facility Agent as contemplated and
restricted by the provisions of Section 12.14 of the Credit Agreement.

4. The Borrower shall provide the opinion of its
counsel, in form and substance acceptable to the Agent, the Finnvera Facility Agent and the Lenders counsel, with respect to the power, capacity, and authority of the Borrower and each of the Guarantors to enter into or intervene in this
Agreement and to perform its obligations hereunder, with respect to the enforceability of this Agreement in accordance with its terms, and with respect to the continued enforceability (unaffected hereby) of all of the Security.



|IV. | MISCELLANEOUS
|--- | -------------

1. All of the provisions of the Original Credit Agreement that are not amended hereby shall remain in full force and effect.

2. This Agreement shall be governed by and construed in accordance with the Laws of the Province of Quebec.

3. The parties acknowledge that they have required that the present agreement, as well as all documents, notices and legal proceedings entered into, given or instituted pursuant hereto or relating
directly or indirectly hereto be drawn up in English. Les parties reconnaissent avoir exigé la rédaction en anglais de la présente convention ainsi que de tous documents exécutés, avis donnés et
procédures judicaires intentées, directement ou indirectement, relativement ou à la suite de la présente convention.



3.



---

IN WITNESS WHEREOF THE PARTIES HERETO HAVE SIGNED THIS AGREEMENT ON THE DATE AND AT THE
PLACE FIRST HEREINABOVE MENTIONED.

(SIGNATURE PAGES FOLLOW)



4.



---

Exhibit 4.2



|               |  |                  
|-------------- |  | -----------------
|VIDÉOTRON LTÉE
|               | 
|Per:           |  | /s/ Chloé Poirier
|               |  | Treasurer        



|                |  |                              
|--------------- |  | -----------------------------
|Address:        |  | 612 St-Jacques Street        
|                |  | 13thFloor                    
|                |  | Montreal, Quebec             
|                |  | H3C 4M8                      
|Attention:      |  | Treasurer                    
|Fax:            |  | (514) 380-1983               
|E-mail:         |  | chloepoirier@quebecor.com    
|               
|With a copy to:
|                | 
|Attention:      |  | Vice-President, Legal Affairs
|Fax:            |  | (514) 985-8834               
|E-mail:         |  | marc.tremblay@quebecor.com   

ROYAL BANK OF CANADA, as Agent for the Lenders



|     |  |                
|---- |  | ---------------
|Per: |  | /s/ Ann Hurley 
|     |  | Manager, Agency



|                                |  |                           |  |      |  |                   
|------------------------------- |  | ------------------------- |  | ---- |  | ------------------
|THE REVOLVING FACILITY LENDERS: |  |                          
|                                | 
|ROYAL BANK OF CANADA            |  | THE TORONTO-DOMINION BANK
|                                |  |                           | 
|Per:                            |  | /s/ Rod Smith             |  | Per: |  | /s/ Yves Bergeron 
|                                |  | Authorized Signatory      |  |      |  |                   
|                                |  |                           | 
|Per:                            |  |                           |  | Per: |  | /s/ Serge Cloutier



---

|                                   |  |                                               |  |      |  |                          
|---------------------------------- |  | --------------------------------------------- |  | ---- |  | -------------------------
|BANK OF MONTREAL                   |  | BANK OF AMERICA, N.A., Canada Branch         
|                                   |  |                                               | 
|Per:                               |  |                                               |  | Per: |  | /s/ Medina Sales de Andre
|                                   |  |                                               | 
|Per:                               |  |                                               |  | Per: |  |                          
|                                   | 
|CANADIAN IMPERIAL BANK OF COMMERCE |  | THE BANK OF NOVA SCOTIA                      
|                                   |  |                                               | 
|Per:                               |  | (signed)                                      |  | Per: |  | (signed)                 
|                                   |  |                                               | 
|Per:                               |  | (signed)                                      |  | Per: |  | (signed)                 
|                                   | 
|CITIBANK, N.A., Canadian Branch    |  | CAISSE CENTRALE DESJARDINS                   
|                                   |  |                                               | 
|Per:                               |  |                                               |  | Per: |  | (signed)                 
|                                   |  |                                               | 
|Per:                               |  |                                               |  | Per: |  | (signed)                 
|                                   | 
|LAURENTIAN BANK OF CANADA          |  | NATIONAL BANK OF CANADA                      
|                                   |  |                                               | 
|Per:                               |  | (signed)                                      |  | Per: |  | (signed)                 
|                                   |  |                                               | 
|Per:                               |  | (signed)                                      |  | Per: |  | (signed)                 
|                                   | 
|HSBC BANK CANADA                   |  | SUMITOMO MITSUI BANKING CORPORATION OF CANADA
|                                   |  |                                               | 
|Per:                               |  | (signed)                                      |  | Per: |  | (signed)                 
|                                   |  |                                               | 
|Per:                               |  | (signed)                                      |  | Per: |  | (signed)                 



6.



---

|                                          |  |         
|----------------------------------------- |  | --------
|HSBC BANK PLC, as Finnvera Facility Agent
|                                          | 
|Per:                                      |  | (signed)
|                                          | 
|Per:                                      |  |         

|                    |  |                           
|------------------- |  | --------------------------
|                   
|Credit Matters     
|                    | 
|Address:            |  | Level 18                  
|                    |  | 8 Canada Square           
|                    |  | Canary Wharf              
|                    |  | London, E14 5HQ           
|                    |  | United Kingdom            
|Attention:          |  | Mark Looi                 
|Telephone:          |  | +44 (0) 20 7991 6255      
|Fax:                |  | +44 (0) 20 7992 4428      
|E-mail:             |  | mark.looi@hsbcib.com      
|Reference:          |  | FC 1311                   
|                   
|Operational Matters
|                    | 
|Address:            |  | Level 18                  
|                    |  | 8 Canada Square           
|                    |  | Canary Wharf              
|                    |  | London, E14 5HQ           
|                    |  | United Kingdom            
|Attention:          |  | Alan Marshall             
|Telephone:          |  | +44 (0) 20 7991 6293      
|Fax:                |  | +44 (0) 20 7992 4428      
|E-mail:             |  | alan.p.marshall@hsbcib.com
|Reference:          |  | FC 1311                   
|-and-               |  |                           
|Attention:          |  | David Wilson              
|Telephone:          |  | +44 (0) 7992 2569         
|Fax:                |  | +44 (0) 20 7992 4428      
|E-mail:             |  | David.a.wilson@hsbcib.com 
|Reference:          |  | FC 1311                   



7.



---

|                                    |  |                           |  |      |  |         
|----------------------------------- |  | ------------------------- |  | ---- |  | --------
|THE FINNVERA TERM FACILITY LENDERS:
|                                    | 
|HSBC BANK PLC                       |  | THE TORONTO-DOMINION BANK
|                                    |  |                           | 
|Per:                                |  | (signed)                  |  | Per: |  | (signed)
|                                    |  |                           | 
|Per:                                |  |                           |  | Per: |  | (signed)

|                    |  |                            |  |                     |  |                                  
|------------------- |  | -------------------------- |  | ------------------- |  | ---------------------------------
|                    | 
|Credit Matters      |  | Credit Matters            
|                    |  |                            | 
|Address:            |  | Level 18                   |  | Address:            |  | The Toronto-Dominion Bank        
|                    |  | 8 Canada Square            |  |                     |  | 77 King Street West              
|                    |  | Canary Wharf               |  |                     |  | Royal Trust Tower, 19thFloor     
|                    |  | London, E14 5HQ            |  |                     |  | Toronto, Ontario M5K 1A2         
|                    |  | United Kingdom             |  | Attention:          |  | Sumit Paliwal                    
|Attention:          |  | Mark Looi                  |  | Telephone:          |  | (416) 983-2803                   
|Telephone:          |  | +44 (0) 20 7991 6255       |  | Fax:                |  | (416) 982-7838                   
|Fax:                |  | +44 (0) 20 7992 4428       |  | E-mail:             |  | sumit.paliwal@tdsecurities.com   
|E-mail:             |  | mark.looi@hsbcib.com       |  |                     |  |                                  
|Reference:          |  | FC 1311                    |  | Operational Matters
|                    |  |                           
|Operational Matters |  | Address:                   |  | TD Securities      
|                    |  |                            |  |                     |  | Global Trade Finance             
|Address:            |  | Level 18                   |  |                     |  | 500 St-Jacques Street, 8thFloor  
|                    |  | 8 Canada Square            |  |                     |  | Montreal, Quebec H2Y 1S1         
|                    |  | Canary Wharf               |  | Attention:          |  | Caroline Danneau                 
|                    |  | London, E14 5HQ            |  | Telephone:          |  | (514) 289-0251                   
|                    |  | United Kingdom             |  | Fax:                |  | (514) 289-1469                   
|Attention:          |  | Alan Marshall              |  | E-mail:             |  | caroline.danneau@tdsecurities.com
|Telephone:          |  | +44 (0) 20 7991 6293       |  |                     |  |                                  
|Fax:                |  | +44 (0) 20 7992 4428       |  |                     |  |                                  
|E-mail:             |  | alan.p.marshall@hsbcib.com |  |                     |  |                                  
|Reference:          |  | FC 1311                    |  |                     |  |                                  
|-and-               |  |                            |  |                     |  |                                  
|Attention:          |  | David Wilson               |  |                     |  |                                  
|Telephone:          |  | +44 (0) 7992 2569          |  |                     |  |                                  
|Fax:                |  | +44 (0) 20 7992 4428       |  |                     |  |                                  
|E-mail:             |  | david.a.wilson@hsbcib.com  |  |                     |  |                                  
|Reference:          |  | FC 1311                    |  |                     |  |                                  



8.



---

|                 |  |                                               |  |      |  |         
|---------------- |  | --------------------------------------------- |  | ---- |  | --------
|CREDIT SUISSE AG |  | SUMITOMO MITSUI BANKING CORPORATION OF CANADA
|                 |  |                                               | 
|Per:             |  | (signed)                                      |  | Per: |  | (signed)
|                 |  |                                               | 
|Per:             |  | (signed)                                      |  | Per: |  |         

|                    |  |                                 |  |                     |  |                                      
|------------------- |  | ------------------------------- |  | ------------------- |  | -------------------------------------
|                    | 
|Credit Matters      |  | Credit Matters                 
|                    |  |                                 | 
|Address:            |  | Credit Suisse AG, Export and    |  | Address:            |  | Ernst & Young Tower, TD Centre       
|                    |  | Structured Trade Finance        |  |                     |  | Suite 1400, Box 172                  
|                    |  | SGAM 316                        |  |                     |  | 222 Bay St.                          
|                    |  | Giesshübelstr, 30               |  |                     |  | Toronto, Ontario                     
|                    |  | 8070 Zürich, Switzerland        |  |                     |  | M5K 1H6                              
|Attention:          |  | Ursula Rickli                   |  | Attention:          |  | Elwood Langley, Senior Vice President
|Telephone:          |  | 00 41 44 333 53 56              |  | Telephone:          |  | (416) 214-3606                       
|Fax:                |  | 00 41 44 333 21 04              |  | Fax:                |  | (416) 367-3565                       
|E-mail:             |  | ursula.rickli@credit-suisse.com |  | E-mail:             |  | elwood_langley@smbcgroup.com         
|                    |  |                                 |  | -or-                |  |                                      
|Operational Matters |  | Ming Chang, Vice President     
|                    |  |                                 |  | Telephone:          |  | (416) 368-4178                       
|Address:            |  | Credit Suisse AG, Export and    |  | Fax:                |  | (416) 367-3565                       
|                    |  | Structured Trade Finance        |  | E-mail:             |  | Ming_Chang@smbcgroup.com             
|                    |  | SGAM 331                        |  |                     |  |                                      
|                    |  | Giesshübelstr. 30               |  | Operational Matters
|                    |  | 8070 Zürich, Switzerland        |  |                     |  |                                      
|Attention:          |  | Dana Bjelos                     |  | Address:            |  | Ernst & Young Tower, TD Centre       
|Telephone:          |  | 00 41 44 333 63 99              |  |                     |  | Suite 1400, Box 172                  
|Fax:                |  | 00 41 44 333 79 80              |  |                     |  | 222 Bay St.                          
|E-mail:             |  | dana.bjelos@credit-suisse.com   |  |                     |  | Toronto, Ontario                     
|                    |  |                                 |  |                     |  | M5K 1H6                              
|                    |  |                                 |  | Attention:          |  | Heather Nakamura, Manager            
|                    |  |                                 |  | Telephone:          |  | (416) 214-3607                       
|                    |  |                                 |  | Fax:                |  | (416) 367-3565                       
|                    |  |                                 |  | E-mail:             |  | heather_nakamura@smbcgroup.com       
|                    |  |                                 |  | -or-                |  |                                      
|                    |  |                                 |  | Attention:          |  | Andrew Yiu, Vice President           
|                    |  |                                 |  | Telephone:          |  | (416) 368-7570                       
|                    |  |                                 |  | Fax:                |  | (416) 367-3565                       
|                    |  |                                 |  | E-mail:             |  | andrew_yiu@smbcgroup.com             



9.



---

Exhibit 4.2

The undersigned acknowledge having taken cognizance of the provisions of the foregoing Agreement and agree that the Guarantees and Security executed by them (A) remain enforceable against them in
accordance with their terms, and (B) continue to guarantee or secure, as applicable, all of the obligations of the Persons specified in such Guarantees and Security Documents in connection with the Credit Agreement as defined above:



|                            |  |                                       |  |      |  |                  
|--------------------------- |  | ------------------------------------- |  | ---- |  | -----------------
|LE SUPERCLUB VIDÉOTRON LTÉE |  | CF CABLE TV INC.                     
|                            |  |                                       | 
|Per:                        |  | /s/ Chloe Poirier                     |  | Per: |  | /s/ Chloe Poirier
|                            |  | Treasurer                             |  |      |  | Treasurer        
|                            | 
|7215924 CANADA INC.         |  | 9219-7919 QUÉBEC INC.                
|                            |  |                                       | 
|Per:                        |  | /s/ Chloe Poirier                     |  | Per: |  | /s/ Chloe Poirier
|                            |  | Treasurer                             |  |      |  | Treasurer        
|                            |  |                                      
|VIDEOTRON US INC.           |  |                                       |  |     
|                            |  |                                       | 
|Per:                        |  | /s/ Marie-Josee Marsan                |  |      |  |                  
|                            |  | Vice President, Finance and Treasurer |  |      |  |                  

The undersigned acknowledges having taken cognizance of the provisions of the
foregoing Agreement and agrees that the pledge of the shares of the Borrower executed by the undersigned as of July 6, 2006 in favour of the Agent (A) remains enforceable against it in accordance with its terms, and (B) continues to
secure all of the obligations of the Persons specified in such Security Document in connection with the Credit Agreement, as defined above:



|                    |  |              
|------------------- |  | -------------
|QUEBECOR MEDIA INC.
|                    | 
|Per:                |  | Chloe Poirier
|                    |  | Treasurer    



---

Exhibit 4.2

SCHEDULE A - LIST OF LENDERS AND COMMITMENTS

The Revolving Facility

Cash Management Facilities  The Toronto-Dominion Bank (TD) - $15,000,000.

Balance of Revolving Facility:



|                                              |  |                |             |                |          |  
|--------------------------------------------- |  | -------------- | ----------- | -------------- | -------- | -
|Lender                                        |  | Commitment ($) |             | Commitment (%) |         
|Royal Bank of Canada                          |  | $              | 77,500,000  |                | 13.47826 | %
|The Bank of Nova Scotia                       |  | $              | 73,000,000  |                | 12.69565 | %
|The Toronto-Dominion Bank                     |  | $              | 73,000,000  |                | 12.69565 | %
|Bank of America N.A., Canada Branch           |  | $              | 73,000,000  |                | 12.69565 | %
|Citibank N.A., Canadian Branch                |  | $              | 50,000,000  |                | 8.69565  | %
|Bank of Montreal                              |  | $              | 41,000,000  |                | 7.13043  | %
|Canadian Imperial Bank of Commerce            |  | $              | 20,000,000  |                | 3.47826  | %
|National Bank of Canada                       |  | $              | 50,500,000  |                | 8.78261  | %
|Caisse centrale Desjardins                    |  | $              | 45,000,000  |                | 7.82609  | %
|Laurentian Bank of Canada                     |  | $              | 17,000,000  |                | 2.95652  | %
|HSBC Bank Canada                              |  | $              | 30,000,000  |                | 5.21739  | %
|Sumitomo Mitsui Banking Corporation of Canada |  | $              | 25,000,000  |                | 4.34783  | %
|                                              |  |                |             |                |          |  
|                                              |  |               
|Total                                         |  | $              | 575,000,000 |                | 100      | %
|                                              |  |                |             |                |          |  
|                                              |  |               
|The Finnvera Term Facility                    |  |                |             |                |          |  
|                                              |  |               
|Lender                                        |  | Commitment ($) |             | Commitment (%) |         
|HSBC Bank plc                                 |  | $              | 28,125,000  |                | 37.5     | %
|The Toronto-Dominion Bank                     |  | $              | 28,125,000  |                | 37.5     | %
|Credit Suisse AG                              |  | $              | 9,375,000   |                | 12.5     | %
|Sumitomo Mitsui Banking Corporation of Canada |  | $              | 9,375,000   |                | 12.5     | %
|                                              |  |                |             |                |          |  
|                                              |  |               
|Total                                         |  | $              | 75,000,000  |                | 100      | %
|                                              |  |                |             |                |          |  



ii.