diff --git a/src-tauri/src/parser/discover.rs b/src-tauri/src/parser/discover.rs
index 67130d1..6d89f91 100644
--- a/src-tauri/src/parser/discover.rs
+++ b/src-tauri/src/parser/discover.rs
@@ -922,11 +922,16 @@ mod tests {
     // the active profile; `instructions_file` is gone from config so instructions arrive
     // via `base_instructions.text` or are absent entirely. The discover scanner must handle
     // both cases without panicking.
+    //
+    // Note: As of Codex v0.134.0 (PRs #23883, #24051, #24055, #24059), --profile-v2 was
+    // renamed to --profile and all legacy profile v1 support was removed. See the v0134_*
+    // tests below for the corresponding v0.134.0 verification.
 
     #[test]
     fn discover_sessions_v0131_profile_v2_session_discovered_correctly() {
-        // session_meta with profile-v2 `profile` field: discover scanner must not panic
-        // and must populate cli_version correctly from the payload.
+        // session_meta with profile-v2 `profile` field (--profile-v2 renamed to --profile
+        // in v0.134.0): discover scanner must not panic and must populate cli_version
+        // correctly from the payload.
         let tmp = tempdir().unwrap();
         let day_dir = tmp.path().join("2026/05/18");
         std::fs::create_dir_all(&day_dir).unwrap();
@@ -980,4 +985,71 @@ mod tests {
         assert_eq!(session.turn_count, 1);
         assert!(!session.is_ongoing);
     }
+
+    // Codex v0.134.0 (PRs #23883, #24051, #24055, #24059): --profile-v2 renamed to --profile;
+    // legacy profile v1 support removed entirely.
+    //
+    // codex-trace reads JSONL session files only — it never invokes `codex` or reads Codex
+    // TOML config. Sessions from v0.134.0+ carry the same `profile` field in session_meta
+    // as v0.131.0+ sessions. The discover scanner is unaffected; these tests confirm
+    // v0.134.0 sessions are discovered and indexed correctly.
+
+    #[test]
+    fn discover_sessions_v0134_profile_session_discovered_correctly() {
+        // session_meta with --profile active (flag renamed from --profile-v2 in v0.134.0):
+        // discover scanner must not panic and must populate cli_version correctly.
+        let tmp = tempdir().unwrap();
+        let day_dir = tmp.path().join("2026/05/26");
+        std::fs::create_dir_all(&day_dir).unwrap();
+        let path = day_dir.join("rollout-2026-05-26T10-00-00-profile.jsonl");
+        std::fs::write(
+            &path,
+            [
+                r#"{"timestamp":"2026-05-26T10:00:00Z","type":"session_meta","payload":{"id":"v0134-disc-profile","timestamp":"2026-05-26T10:00:00Z","cwd":"/home/user","cli_version":"0.134.0","model_provider":"openai","profile":"work","base_instructions":{"text":"You are helpful."}}}"#,
+                r#"{"timestamp":"2026-05-26T10:00:01Z","type":"event_msg","payload":{"type":"task_started","turn_id":"turn-1"}}"#,
+                r#"{"timestamp":"2026-05-26T10:00:02Z","type":"event_msg","payload":{"type":"task_complete","turn_id":"turn-1","completed_at":1748254802.0}}"#,
+            ]
+            .join("\n"),
+        )
+        .unwrap();
+
+        let sessions = discover_sessions(tmp.path()).unwrap();
+        let session = sessions
+            .iter()
+            .find(|s| s.id == "v0134-disc-profile")
+            .unwrap();
+        assert_eq!(session.cli_version.as_deref(), Some("0.134.0"));
+        assert_eq!(session.turn_count, 1);
+        assert!(!session.is_ongoing);
+    }
+
+    #[test]
+    fn discover_sessions_v0134_no_profile_discovered_correctly() {
+        // v0.134.0 session without --profile: no `profile` field in session_meta.
+        // The discover scanner must index the session normally — the absent field has no
+        // effect on discovery (legacy profile v1 removal is transparent to codex-trace).
+        let tmp = tempdir().unwrap();
+        let day_dir = tmp.path().join("2026/05/26");
+        std::fs::create_dir_all(&day_dir).unwrap();
+        let path = day_dir.join("rollout-2026-05-26T10-01-00-noprofile.jsonl");
+        std::fs::write(
+            &path,
+            [
+                r#"{"timestamp":"2026-05-26T10:01:00Z","type":"session_meta","payload":{"id":"v0134-disc-noprofile","timestamp":"2026-05-26T10:01:00Z","cwd":"/home/user","cli_version":"0.134.0","model_provider":"openai"}}"#,
+                r#"{"timestamp":"2026-05-26T10:01:01Z","type":"event_msg","payload":{"type":"task_started","turn_id":"turn-1"}}"#,
+                r#"{"timestamp":"2026-05-26T10:01:02Z","type":"event_msg","payload":{"type":"task_complete","turn_id":"turn-1","completed_at":1748254862.0}}"#,
+            ]
+            .join("\n"),
+        )
+        .unwrap();
+
+        let sessions = discover_sessions(tmp.path()).unwrap();
+        let session = sessions
+            .iter()
+            .find(|s| s.id == "v0134-disc-noprofile")
+            .unwrap();
+        assert_eq!(session.cli_version.as_deref(), Some("0.134.0"));
+        assert_eq!(session.turn_count, 1);
+        assert!(!session.is_ongoing);
+    }
 }
diff --git a/src-tauri/src/parser/entry.rs b/src-tauri/src/parser/entry.rs
index 23ffe37..09c348d 100644
--- a/src-tauri/src/parser/entry.rs
+++ b/src-tauri/src/parser/entry.rs
@@ -363,6 +363,10 @@ mod tests {
     // PR #22647 made Codex reject the legacy [profiles] TOML section when profile-v2 is active.
     // PR #22724 removed the experimental `instructions_file` config key entirely.
     //
+    // Note: As of Codex v0.134.0 (PRs #23883, #24051, #24055, #24059), --profile-v2 was
+    // renamed to --profile and all legacy profile v1 support was removed. See the v0134_*
+    // tests below for the corresponding v0.134.0 verification.
+    //
     // codex-trace does NOT read Codex CLI config files (TOML profiles). It reads only the
     // JSONL session files at ~/.codex/sessions/. The profile-v2 changes affect what Codex
     // writes into session_meta entries:
@@ -377,8 +381,9 @@ mod tests {
 
     #[test]
     fn v0131_session_meta_with_profile_v2_field_does_not_panic() {
-        // session_meta from a v0.131.0 session started with --profile-v2 active.
-        // The `profile` field names the active profile; codex-trace ignores it gracefully.
+        // session_meta from a v0.131.0 session started with --profile-v2 active (renamed to
+        // --profile in v0.134.0). The `profile` field names the active profile; codex-trace
+        // ignores it gracefully.
         let line = r#"{"timestamp":"2026-05-18T10:00:00Z","type":"session_meta","payload":{"id":"v0131-profile-v2","timestamp":"2026-05-18T10:00:00Z","cwd":"/tmp","cli_version":"0.131.0","profile":"work","base_instructions":{"text":"You are a helpful assistant."}}}"#;
         let e = RawEntry::parse(line).expect("session_meta with profile-v2 fields must parse");
         assert_eq!(e.entry_type, "session_meta");
@@ -537,4 +542,69 @@ mod tests {
         assert_eq!(meta.payload["cli_version"], "0.134.0");
         assert_eq!(meta.payload["id"], "v0134-session");
     }
+
+    // Codex v0.134.0 (PRs #23883, #24051, #24055, #24059): --profile-v2 renamed to --profile;
+    // legacy profile v1 support removed entirely.
+    //
+    // PRs #23883, #24051, #24055, #24059 promoted --profile to the primary profile selector
+    // and removed all legacy profile v1 resolution and write paths. Passing a legacy profile
+    // selector now returns an error instead of silently falling back. This is a CLI-level
+    // change: codex-trace does NOT invoke `codex` at runtime and does NOT read Codex TOML
+    // config files. Sessions from v0.134.0+ carry the same `profile` field in session_meta
+    // as v0.131.0+ sessions — the only observable difference for codex-trace is the
+    // cli_version bump. The parser is unaffected; these tests confirm v0.134.0 sessions
+    // parse correctly.
+
+    #[test]
+    fn v0134_session_meta_with_profile_field_does_not_panic() {
+        // session_meta from v0.134.0 with --profile active (flag renamed from --profile-v2).
+        // The `profile` field names the active profile; codex-trace reads it gracefully.
+        let line = r#"{"timestamp":"2026-05-26T10:00:00Z","type":"session_meta","payload":{"id":"v0134-profile","timestamp":"2026-05-26T10:00:00Z","cwd":"/tmp","cli_version":"0.134.0","profile":"work","base_instructions":{"text":"You are a helpful assistant."}}}"#;
+        let e = RawEntry::parse(line).expect("session_meta with profile field must parse");
+        assert_eq!(e.entry_type, "session_meta");
+        assert_eq!(e.payload["id"], "v0134-profile");
+        assert_eq!(e.payload["cli_version"], "0.134.0");
+        assert_eq!(e.payload["profile"], "work");
+        assert_eq!(
+            e.payload["base_instructions"]["text"],
+            "You are a helpful assistant."
+        );
+    }
+
+    #[test]
+    fn v0134_session_meta_without_profile_does_not_panic() {
+        // v0.134.0 session started without --profile: no `profile` field in session_meta.
+        // The parser must handle the absent field gracefully (opt_str returns None).
+        let line = r#"{"timestamp":"2026-05-26T10:01:00Z","type":"session_meta","payload":{"id":"v0134-no-profile","timestamp":"2026-05-26T10:01:00Z","cwd":"/home/user","cli_version":"0.134.0","model_provider":"openai"}}"#;
+        let e = RawEntry::parse(line).expect("session_meta without profile must parse");
+        assert_eq!(e.entry_type, "session_meta");
+        assert_eq!(e.payload["id"], "v0134-no-profile");
+        assert!(e.payload.get("profile").is_none());
+    }
+
+    #[test]
+    fn v0134_all_standard_entry_types_parse_correctly_with_profile() {
+        // Regression guard: all four standard JSONL entry types must parse under v0.134.0.
+        let lines = [
+            r#"{"timestamp":"2026-05-26T10:02:00Z","type":"session_meta","payload":{"id":"v0134-session-profile","timestamp":"2026-05-26T10:02:00Z","cwd":"/tmp","cli_version":"0.134.0","profile":"default","model_provider":"openai"}}"#,
+            r#"{"timestamp":"2026-05-26T10:02:01Z","type":"event_msg","payload":{"type":"task_started","turn_id":"turn-1"}}"#,
+            r#"{"timestamp":"2026-05-26T10:02:02Z","type":"response_item","payload":{"type":"message","role":"assistant","content":"Hello"}}"#,
+            r#"{"timestamp":"2026-05-26T10:02:03Z","type":"turn_context","payload":{"model":"gpt-5","cwd":"/tmp"}}"#,
+            r#"{"timestamp":"2026-05-26T10:02:04Z","type":"event_msg","payload":{"type":"task_complete","turn_id":"turn-1","completed_at":1748254924.0}}"#,
+        ];
+        let expected_types = [
+            "session_meta",
+            "event_msg",
+            "response_item",
+            "turn_context",
+            "event_msg",
+        ];
+        for (line, expected) in lines.iter().zip(expected_types.iter()) {
+            let entry = RawEntry::parse(line).expect("parse failed");
+            assert_eq!(entry.entry_type, *expected, "wrong type for: {line}");
+        }
+        let meta = RawEntry::parse(lines[0]).unwrap();
+        assert_eq!(meta.payload["cli_version"], "0.134.0");
+        assert_eq!(meta.payload["profile"], "default");
+    }
 }
diff --git a/src-tauri/src/parser/session.rs b/src-tauri/src/parser/session.rs
index 5389dad..80a1ba8 100644
--- a/src-tauri/src/parser/session.rs
+++ b/src-tauri/src/parser/session.rs
@@ -682,11 +682,16 @@ mod tests {
     // the active profile, and instructions now come via `base_instructions.text` from the
     // profile's system_prompt (the `instructions_file` config key is gone from Codex config).
     // All cases below must parse without panics and produce correct field values.
+    //
+    // Note: As of Codex v0.134.0 (PRs #23883, #24051, #24055, #24059), --profile-v2 was
+    // renamed to --profile and all legacy profile v1 support was removed. See the v0134_*
+    // tests below for the corresponding v0.134.0 verification.
 
     #[test]
     fn v0131_profile_v2_session_parses_correctly() {
-        // session_meta from v0.131.0 with --profile-v2 active: carries `profile` field and
-        // instructions sourced from the profile's system_prompt via base_instructions.text.
+        // session_meta from v0.131.0 with --profile-v2 active (renamed to --profile in
+        // v0.134.0): carries `profile` field and instructions sourced from the profile's
+        // system_prompt via base_instructions.text.
         let tmp = tempdir().unwrap();
         let path = tmp
             .path()
@@ -818,4 +823,92 @@ mod tests {
             .expect("spawn_agent tool call should embed worker session");
         assert_eq!(worker.id, "worker-v131");
     }
+
+    // Codex v0.134.0 (PRs #23883, #24051, #24055, #24059): --profile-v2 renamed to --profile;
+    // legacy profile v1 support removed entirely.
+    //
+    // codex-trace reads JSONL session files only — it never invokes `codex` or reads Codex
+    // TOML config. Sessions from v0.134.0+ carry the same `profile` field in session_meta
+    // as v0.131.0+ sessions. The parser is unaffected; these tests confirm v0.134.0
+    // sessions parse correctly and produce the expected field values.
+
+    #[test]
+    fn v0134_profile_session_parses_correctly() {
+        // session_meta from v0.134.0 with --profile active (flag renamed from --profile-v2).
+        let tmp = tempdir().unwrap();
+        let path = tmp.path().join("rollout-2026-05-26T10-00-00-profile.jsonl");
+        std::fs::write(
+            &path,
+            [
+                r#"{"timestamp":"2026-05-26T10:00:00Z","type":"session_meta","payload":{"id":"v0134-profile","timestamp":"2026-05-26T10:00:00Z","cwd":"/home/user","cli_version":"0.134.0","model_provider":"openai","profile":"work","base_instructions":{"text":"You are a helpful assistant."}}}"#,
+                r#"{"timestamp":"2026-05-26T10:00:01Z","type":"event_msg","payload":{"type":"task_started","turn_id":"turn-1"}}"#,
+                r#"{"timestamp":"2026-05-26T10:00:02Z","type":"event_msg","payload":{"type":"task_complete","turn_id":"turn-1","completed_at":1748254802.0}}"#,
+            ]
+            .join("\n"),
+        )
+        .unwrap();
+
+        let session = parse_session(&path).unwrap();
+        assert_eq!(session.id, "v0134-profile");
+        assert_eq!(session.cli_version.as_deref(), Some("0.134.0"));
+        assert_eq!(
+            session.instructions.as_deref(),
+            Some("You are a helpful assistant.")
+        );
+        assert_eq!(session.turns.len(), 1);
+        assert!(!session.is_ongoing);
+    }
+
+    #[test]
+    fn v0134_session_without_profile_parses_correctly() {
+        // v0.134.0 session started without --profile: no `profile` field in session_meta.
+        // parse_session must return None for instructions, not panic.
+        let tmp = tempdir().unwrap();
+        let path = tmp
+            .path()
+            .join("rollout-2026-05-26T10-01-00-noprofile.jsonl");
+        std::fs::write(
+            &path,
+            [
+                r#"{"timestamp":"2026-05-26T10:01:00Z","type":"session_meta","payload":{"id":"v0134-no-profile","timestamp":"2026-05-26T10:01:00Z","cwd":"/home/user","cli_version":"0.134.0","model_provider":"openai"}}"#,
+                r#"{"timestamp":"2026-05-26T10:01:01Z","type":"event_msg","payload":{"type":"task_started","turn_id":"turn-1"}}"#,
+                r#"{"timestamp":"2026-05-26T10:01:02Z","type":"event_msg","payload":{"type":"task_complete","turn_id":"turn-1","completed_at":1748254862.0}}"#,
+            ]
+            .join("\n"),
+        )
+        .unwrap();
+
+        let session = parse_session(&path).unwrap();
+        assert_eq!(session.id, "v0134-no-profile");
+        assert_eq!(session.cli_version.as_deref(), Some("0.134.0"));
+        assert!(session.instructions.is_none());
+        assert_eq!(session.turns.len(), 1);
+    }
+
+    #[test]
+    fn v0134_legacy_profile_v1_absent_does_not_affect_session_parsing() {
+        // v0.134.0 removed legacy profile v1 support entirely. Since codex-trace reads only
+        // JSONL session files (never Codex TOML config), the removal has no effect on
+        // parsing. Standard v0.134.0 sessions must parse correctly regardless.
+        let tmp = tempdir().unwrap();
+        let path = tmp.path().join("rollout-2026-05-26T10-02-00-v0134.jsonl");
+        std::fs::write(
+            &path,
+            [
+                r#"{"timestamp":"2026-05-26T10:02:00Z","type":"session_meta","payload":{"id":"v0134-standard","timestamp":"2026-05-26T10:02:00Z","cwd":"/workspace","cli_version":"0.134.0","model_provider":"openai","profile":"default"}}"#,
+                r#"{"timestamp":"2026-05-26T10:02:01Z","type":"event_msg","payload":{"type":"task_started","turn_id":"turn-1"}}"#,
+                r#"{"timestamp":"2026-05-26T10:02:02Z","type":"response_item","payload":{"type":"message","role":"assistant","content":"Hello"}}"#,
+                r#"{"timestamp":"2026-05-26T10:02:03Z","type":"turn_context","payload":{"model":"gpt-5","cwd":"/workspace"}}"#,
+                r#"{"timestamp":"2026-05-26T10:02:04Z","type":"event_msg","payload":{"type":"task_complete","turn_id":"turn-1","completed_at":1748254924.0}}"#,
+            ]
+            .join("\n"),
+        )
+        .unwrap();
+
+        let session = parse_session(&path).unwrap();
+        assert_eq!(session.id, "v0134-standard");
+        assert_eq!(session.cli_version.as_deref(), Some("0.134.0"));
+        assert_eq!(session.turns.len(), 1);
+        assert!(!session.is_ongoing);
+    }
 }