delivered the opinion of the court:
The defendant, Vincent Britt-El, filed a second post-conviction petition along with a “Motion For Leave To File Second Post-Conviction Petition” in the circuit court of Vermilion County. The circuit court denied the motion as “untimely” and did not consider the merits of defendant’s petition. On appeal, the appellate court treated the circuit court’s ruling as a summary dismissal of defendant’s post-conviction petition and affirmed. The appellate court held that defendant’s petition was an improper, successive petition that was not permitted under the Post-Conviction Hearing Act (Act) (725 ILCS 5/122 — 1 et seq. (West 2000)). No. 4 — 99—0738 (unpublished order under Supreme Court Rule 23). For the reasons that follow, we affirm the judgment of the appellate court.
BACKGROUND
Following a jury trial, defendant was convicted and sentenced on two counts of first degree murder and other felony offenses. Defendant’s convictions and sentences were affirmed on direct appeal. People v. Britt, 265 Ill. App. 3d 129 (1994). Defendant filed a petition for leave to appeal from this decision which was denied at the September 1995 term of court. People v. Britt, 163 Ill. 2d 567 (1995).
On August 29, 1996, defendant filed his first petition for post-conviction relief. In this petition, defendant al*333leged that he had been denied the effective assistance of counsel at trial. Specifically, defendant asserted that his trial counsel had erred in advising defendant not to testify at trial and during a hearing on defendant’s motion to suppress. Defendant further alleged that trial counsel had failed to have a “vital” witness testify during the hearing on the motion to suppress, and that trial counsel had failed to properly cross-examine several of the State’s key witnesses at trial. On the same day that defendant filed his first post-conviction petition, the circuit court concluded that it did not have jurisdiction to consider the petition because it was filed outside the time limitations set forth in section 122 — 1 of the Act. See 725 ILCS 5/122 — 1 (West 1996). Accordingly, the circuit court dismissed the petition.
On September 11, 1996, defendant filed a motion to reconsider. In this motion, defendant conceded that his petition was untimely filed. Defendant noted, however, that under section 122 — 1 of the Act, an untimely petition may be considered on the merits if the “petitioner alleges facts showing that the delay in filing was not due to his culpable negligence.” 725 ILCS 5/122 — 1 (West 2000). Defendant argued that the prison in which he was incarcerated had been on “several severe lockdowns”, that he had been denied access to the prison law library, and that he had been unable to prepare his post-conviction petition. Thus, according to defendant, the delay in filing the petition was not due to his culpable negligence, and his tardiness in filing the petition should have been excused. The circuit court rejected these arguments and denied defendant’s motion to reconsider. Defendant appealed.
On appeal, the appellate court affirmed the circuit court’s dismissal of defendant’s first post-conviction petition. People v. Britt, No. 4 — 96—0730 (1997) (unpublished order under Supreme Court Rule 23). Citing to People v. *334 Heirens, 271 Ill. App. 3d 392 (1995), which was the governing case law at that time, the appellate court held that “the time frame of section 122 — 1 of the Act within which a defendant must file his postconviction petition is jurisdictional, so that the petition is barred if not timely filed.” The appellate court noted that defendant had conceded that his petition was untimely. The appellate court then considered and rejected defendant’s argument that the delay in filing his petition could be excused because it was not due to defendant’s culpable negligence. The appellate court concluded that, even accepting that defendant’s prison had been on lockdown, this excused only a portion of the delay in filing. According to the appellate court, defendant’s petition was still an additional 11 months tardy beyond that which could be excused by the lockdown and defendant had offered no explanation for this further delay. Accordingly, the appellate court held that the petition was untimely filed and, therefore, that the court was “without jurisdiction to entertain” defendant’s post-conviction petition. Defendant subsequently filed a petition for leave to appeal which was denied at the January 1998 term of court. People v. Britt, 176 Ill. 2d 578 (1998).
On August 9, 1999, defendant filed a second post-conviction petition along with a “Motion For Leave To File A Second Post-Conviction Petition” in the circuit court. In this second petition, which is the subject of the present appeal, defendant repeated the allegations of ineffective assistance of counsel that were presented in his first petition. Defendant also raised numerous additional allegations of constitutional violations. Defendant alleged, for example, that his trial counsel was constitutionally ineffective because he failed to request certain limiting instructions, failed to object to the introduction of autopsy photos, and failed to move to suppress certain items of evidence. Defendant also *335contended that several of the trial court’s rulings and several comments made by the prosecutor had denied him certain constitutional rights.
In his “Motion For Leave To File A Second Post-Conviction Petition,” defendant repeated the same argument regarding culpable negligence that he had made during his first post-conviction proceeding, even though this argument had previously been rejected by the appellate court. In his motion, defendant asserted that, during the time in which he was trying to prepare his first post-conviction petition, the prison in which he was incarcerated was on several “severe lockdowns” and that this excused the tardy filing of the first petition. After making these assertions, defendant concluded by stating that “the failure of the court to consider these claims made herein [in his second post-conviction petition] will result in a fundamental miscarriage of justice.” Defendant then requested that the circuit court “grant[ ] him leave to file [a] second post-conviction petition.”
In a docket entry, the circuit court rejected defendant’s argument that the second petition was timely filed and denied defendant’s motion for leave to file a second post-conviction petition. Defendant appealed.
On appeal, the appellate court did not consider whether defendant’s second post-conviction petition was timely filed but, instead, addressed whether the petition was procedurally barred as an improper, successive petition. In so doing, the appellate court treated the circuit court’s denial of defendant’s motion for leave to file a second post-conviction petition as a summary dismissal of the second post-conviction petition. See 725 ILCS 5/122 — 2.1(a)(2) (West 2000).
Before the appellate court, defendant acknowledged that the filing of successive post-conviction petitions is generally prohibited under the Post-Conviction Hearing Act. Defendant maintained, however, that the circum*336stances of his case fell within the exception which allows successive petitions when it can be shown thát “the proceedings on the initial petition were deficient in some fundamental way.” People v. Flores, 153 Ill. 2d 264, 273-74 (1992). In support of this argument, defendant cited this court’s opinion in People v. Wright, 189 Ill. 2d 1 (1999), a decision which was issued after the completion of defendant’s first post-conviction proceedings. According to defendant, Wright overruled Heirens and established that the time limitations in the Act are not jurisdictional but are, instead, a statute of limitations which can only be raised as an affirmative defense by the State in responsive pleadings. Based on this reading of Wright, defendant maintained that the circuit court lacked the authority, under section 122 — 2.1(a)(2) of the Act, to sua sponte consider the timeliness of his first post-conviction petition during the initial stage of post-conviction review. Therefore, in defendant’s view, the proceedings on his initial petition were fundamentally deficient and his second petition should have been considered by the circuit court on the merits.
The appellate court rejected these arguments and affirmed the dismissal of defendant’s second post-conviction petition. We then granted defendant’s petition for leave to appeal. See 177 Ill. 2d R. 315.
ANALYSIS
At the outset, defendant offers an argument, unrelated to the argument concerning Wright which was advanced in the appellate court, for why his second post-conviction petition should be given consideration on the merits. As he did before the appellate court, defendant acknowledges that the Post-Conviction Hearing Act generally prohibits the filing of successive post-conviction petitions. See People v. Flores, 153 Ill. 2d 264, 273 (1992) (“The Post-Conviction Hearing Act contemplates the filing of only one post-conviction petition”), citing People v. *337 Free, 122 Ill. 2d 367, 375 (1989). Defendant contends, however, that the disposition of his first post-conviction petition, filed in 1996, did not constitute a complete or valid initial post-conviction proceeding. Defendant maintains that his first post-conviction proceeding did not afford him the opportunity to have his ineffective assistance of counsel claims heard on the merits because the first post-conviction petition was dismissed on the basis that it was untimely filed. Since he never received a merits-based ruling on his first petition, defendant argues that his first post-conviction proceeding was, in effect, a nullity. Therefore, according to defendant, his second post-conviction petition, filed in 1999, was not a “successive” petition as that term is used with respect to the Act and the ineffective assistance of counsel claims raised in that petition may be considered on the merits. We disagree.
Defendant received every procedural right, including the opportunity to have his claims heard on the merits, that was available to him at the time his first post-conviction petition was filed. When defendant’s first petition was filed in 1996, the controlling case law interpreting the time limitations in the Act was found in People v. Heirens, 271 Ill. App. 3d 392 (1995). Under that decision, the time limitations in the Act were considered jurisdictional and it was incumbent upon a petitioner who filed an untimely post-conviction petition to affirmatively plead “facts showing that the delay [in filing] was not due to his or her culpable negligence” (725 ILCS 5/122— 1(c) (West 2000)) in order to have his claims heard on the merits. Defendant took advantage of this “safety valve” in an effort to have his claims heard. Before the circuit court, defendant conceded that his first post-conviction petition was untimely filed but argued that the delay in filing the petition was not due to his culpable negligence because the prison in which he was incarcer*338ated had been on lockdown. The circuit court rejected this argument. The appellate court, after full consideration, affirmed. The appellate court held that, even accepting all of defendant’s arguments regarding culpable negligence as true, there remained an unexcused delay in the filing of the petition. This court denied the defendant’s petition for leave to appeal from the appellate court’s decision. Thus, there was a full and final resolution on whether defendant had established a lack of culpable negligence. Defendant was accorded all the procedural rights and protections any post-conviction petitioner could have received under the Act as it was interpreted at the time the first petition was filed. Under these circumstances, it cannot be said that defendant’s first post-conviction proceeding was a nullity. Accordingly, defendant’s second post-conviction petition, the petition at issue in the case at bar, is a successive petition for purposes of the Post-Conviction Hearing Act.
Defendant argues, however, that even if his second post-conviction petition is a successive petition, it may nevertheless be considered on the merits because the proceedings on his initial post-conviction petition were fundamentally deficient pursuant to Wright. Before addressing this argument, we clarify the scope of the issue presented. Defendant’s second post-conviction petition presents numerous claims of constitutional violations, the majority of which were not raised in defendant’s first post-conviction petition. Section 122 — 3 of the Post-Conviction Hearing Act provides that “[a]ny claim of substantial denial of constitutional rights not raised in the original or an amended petition is waived.” 725 ILCS 5/122 — 3 (West 2000). In his brief before this court, defendant does not mention the additional claims raised in his second post-conviction petition nor does he argue that these claims are excused from the waiver provision of section 122 — 3. Further, even under the principal argu*339ment advanced by defendant both here and in the appellate court, i.e., that defendant’s first post-conviction petition was erroneously dismissed on jurisdictional grounds, we discern no reason why the additional claims could not have been included in defendant’s first petition. Accordingly, those claims in defendant’s second petition which were not included in his first petition are waived. That being the case, the scope of our review is limited to consideration of those claims of ineffective assistance of trial counsel which were presented in both defendant’s first post-conviction petition and his second. See People v. Pitsonbarger, 205 Ill. 2d 444, 461-62 (2002) (each claim in a successive petition must be reviewed to ascertain whether the claim is barred).
We now turn to defendant’s argument that his first post-conviction proceedings were fundamentally deficient under Wright. A narrow exception to the rule prohibiting successive post-conviction petitions holds that a claim presented in a successive petition may be given consideration when the proceedings on the initial petition were “deficient in some fundamental way.” People v. Flores, 153 Ill. 2d 264, 273-74 (1992). To establish a fundamental deficiency which will permit consideration of the successive petition, a defendant must demonstrate both “cause and prejudice” with respect to each claim raised. See generally People v. Pitsonbarger, 205 Ill. 2d 444 (2002). “For purposes of this test, ‘cause’ is further defined as some objective factor external to the defense that impeded counsel’s efforts to raise the claim in an earlier proceeding, and ‘prejudice’ is defined as an error which so infected the entire trial that the resulting conviction violates due process. Flores, 153 Ill. 2d at 279.” People v. Jones, 191 Ill. 2d 194, 199 (2000).
Defendant’s explanation for why the claims of ineffective assistance of counsel which are repeated in his second post-conviction petition should be considered on *340the merits — his argument as to why he has satisfied the cause inquiry — is based on the assertion that the circuit court improperly impeded his ability to bring those claims in his first post-conviction petition because the court sua sponte considered the timeliness of that petition. In support of this argument, defendant relies upon this court’s decision in Wright. Wright, however, was decided in November 1999, almost two years after defendant’s appeal from the denial of his first post-conviction petition was completed. As noted, the controlling case law at the time of defendant’s first post-conviction proceedings was found in Heirens, an opinion which held that the time limitations in the Post-Conviction Hearing Act were jurisdictional and could properly be raised sua sponte by the circuit court. Thus, in arguing that his first post-conviction proceedings were fundamentally deficient pursuant to Wright, defendant is contending that our holding in Wright should be applied retroactively to his first proceeding.
The State, in response to defendant’s arguments, first contests defendant’s reading of Wright. According to the State, even under Wright, the circuit court retains the authority to sua sponte consider the timeliness of a post-conviction petition during the initial stage of review. Furthermore, in the State’s view, even if Wright does stand for the proposition that the circuit court may not sua sponte consider the timeliness of a post-conviction petition, that holding should not be applied to defendant’s first post-conviction petition. The State maintains that “the People’s interest in the finality of criminal litigation and judgments” should preclude application of Wright and prevent consideration of the claims raised in defendant’s second petition.
Initially, we note that any confusion as to the meaning of Wright, and any confusion as to whether a circuit court possesses the authority to sua sponte raise the *341timeliness of a post-conviction petition during the initial stage of post-conviction review, has been resolved by our recent decision in People v. Boclair, 202 Ill. 2d 89 (2002). In that case, we concluded that the Act does not permit the summary dismissal of a post-conviction petition during the first stage of post-conviction review on the ground that the petition is untimely. Boclair, 202 Ill. 2d at 96-102. Consequently, having concluded in Boclair that a circuit court may not sua sponte dismiss a petition on the basis of timeliness, the question in this case becomes whether the holding of Boclair should be given retroactive application to defendant’s first post-conviction proceeding. Under this court’s case law, the answer to this question is no.
In People v. Szabo, 186 Ill. 2d 19 (1998), the defendant filed a second post-conviction petition in which he sought to take advantage of a decision of this court, People v. Johnson, 154 Ill. 2d 227 (1993), that had been announced after the completion of his first post-conviction proceedings. Johnson addressed the duties of post-conviction counsel which arise under Supreme Court Rule 651(c) (134 Ill. 2d R. 651(c)). In substance, the defendant in Szabo sought a reexamination of the holding in the appeal from his first post-conviction appeal, arguing that the appeal was deficient based upon Johnson. This court rejected this argument, stating:
“Johnson was decided after the present defendant’s appeal from the denial of his first post-conviction petition. We do not believe that Johnson controls the outcome of the present case, any more than we believe that Johnson governs other post-conviction matters that were concluded long ago. The proceedings on defendant Szabo’s first post-conviction petition had been entirely completed by the time Johnson was decided.” Szabo, 186 Ill. 2d at 25.
Applying the logic of Szabo to the instant appeal, this court’s holding in Boclair that a circuit court may not raise the issue of timeliness sua sponte cannot be applied *342retroactively to defendant’s first post-conviction proceeding.
Further, even under a general fundamental fairness inquiry, it is clear that the holding adopted in Boclair should not be applied retroactively to defendant’s first post-conviction proceeding. Cf. Teague v. Lane, 489 U.S. 288, 307, 103 L. Ed. 2d 334, 353, 109 S. Ct. 1060, 1073 (1989) (decisions establishing new constitutional rules of criminal procedure may be applied retroactively to cases pending on collateral review where the new rule requires the observance of those procedures that are implicit in the concept of ordered liberty). In the case at bar, after defendant’s first post-conviction petition was initially dismissed, defendant filed a motion to reconsider in which he alleged that his tardy filing was not due to his culpable negligence. See 725 ILCS 5/122 — 1 (West 2000). The circuit court denied that motion. On appeal in 1997, the appellate court fully discussed the issue of culpable negligence and held that defendant’s petition was untimely. Defendant’s petition for leave to appeal from that decision was denied. Thus, on the critical issues of whether defendant’s first petition was, in fact, untimely and whether he lacked culpable negligence for the tardy filing, defendant has had his day in court. These issues were fully and finally litigated in the trial court, the appellate court, and this court when it denied defendant’s petition for leave to appeal.
Significantly, neither the holding in Wright nor the holding in Boclair changed the length of the post-conviction time limitations or the definition of culpable negligence. Indeed, from defendant’s perspective, and as a practical matter, the only relevant change that has been made in post-conviction law since the first post-conviction proceeding was completed is that now the issue of timeliness must be affirmatively raised by the State, rather than the circuit court. Thus, viewing the first post-*343conviction proceeding from the perspective of the new law established in Boclair, the only way it can be said that defendant has suffered any prejudice is that, during the first post-conviction proceeding, defendant was denied the possibility that the State might have elected to waive the timeliness issue. However, in the course of the present appeal, the State has continued to argue that defendant was culpably negligent in filing the first petition and that the first petition was therefore untimely filed. In other words, the State, being fully aware of the nature of defendant’s claims of ineffective assistance of counsel, has made known that it would have pursued the timeliness defense during the first post-conviction proceeding and would not have waived it. Defendant has therefore not been prejudiced in any way by the change in the law announced in Boclair. Under these circumstances, denying retroactive application would not be fundamentally unfair to defendant.
Boclair may not be applied retroactively to defendant’s first post-conviction proceeding. Accordingly, defendant cannot establish cause for proceeding on the claims of ineffective assistance of counsel which are repeated in his second petition. Thus, the claims of ineffective assistance of counsel which are repeated in defendant’s second post-conviction petition are procedurally barred from consideration on the merits.
CONCLUSION
For the foregoing reasons, the appellate court properly affirmed the dismissal of defendant’s second post-conviction petition.
Affirmed.