diff --git a/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_lowlat_0.yaml b/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_lowlat_0.yaml
index e4e023d385..4f6225f44c 100644
--- a/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_lowlat_0.yaml
+++ b/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_lowlat_0.yaml
@@ -14,7 +14,7 @@ model:
   precision: "fp4"
 
 dynamo:
-  version: "1.1.0"
+  version: "1.5.0.dev20260908"
 
 frontend:
   type: dynamo
diff --git a/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_0.yaml b/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_0.yaml
index 29f5523057..ed2f946841 100644
--- a/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_0.yaml
+++ b/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_0.yaml
@@ -15,7 +15,7 @@ model:
   precision: "fp4"
 
 dynamo:
-  version: "1.1.0"
+  version: "1.5.0.dev20260908"
 
 frontend:
   type: dynamo
diff --git a/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_1.yaml b/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_1.yaml
index 064463297b..df9a316e05 100644
--- a/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_1.yaml
+++ b/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_1.yaml
@@ -15,7 +15,7 @@ model:
   precision: "fp4"
 
 dynamo:
-  version: "1.1.0"
+  version: "1.5.0.dev20260908"
 
 frontend:
   type: dynamo
diff --git a/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_2.yaml b/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_2.yaml
index 94f3f3509d..f598153997 100644
--- a/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_2.yaml
+++ b/benchmarks/multi_node/srt-slurm-recipes/sglang/qwen3.5/gb300-fp4/8k1k/disagg/stp/8k1k_stp_maxtpt_2.yaml
@@ -15,7 +15,7 @@ model:
   precision: "fp4"
 
 dynamo:
-  version: "1.1.0"
+  version: "1.5.0.dev20260908"
 
 frontend:
   type: dynamo
diff --git a/configs/nvidia-master.yaml b/configs/nvidia-master.yaml
index 1d0144da48..4c64542673 100644
--- a/configs/nvidia-master.yaml
+++ b/configs/nvidia-master.yaml
@@ -6443,13 +6443,13 @@ qwen3.5-fp8-h100-sglang-mtp:
 
     # ---------- 1k1k high-throughput (wide-EP TP=32 decode) ----------
 qwen3.5-fp4-gb300-dynamo-sglang:
-  image: lmsysorg/sglang:v0.5.14-cu130
+  image: lmsysorg/sglang:v0.5.19-cu130
   model: nvidia/Qwen3.5-397B-A17B-NVFP4-V2
   model-prefix: qwen3.5
   runner: gb300
   precision: fp4
   framework: dynamo-sglang
-  router: { name: dynamo-router, version: "1.1.0" }
+  router: { name: dynamo-router, version: "1.5.0.dev20260908" }
   multinode: true
   disagg: true
   scenarios:
diff --git a/perf-changelog.yaml b/perf-changelog.yaml
index 390afc2ecf..a15ab2d70a 100644
--- a/perf-changelog.yaml
+++ b/perf-changelog.yaml
@@ -6969,3 +6969,11 @@
     - "Use SGLang's current W4A4 MegaMoE and DP LM-head flags for DP-attention instead of the deprecated MegaMoE environment variables."
     - "Resolve draft-model jobs through the existing B200 SGLang speculative recipe and the staged DeepSeek-V4-Pro-0813 checkpoint."
   pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/2821
+
+- config-keys:
+    - qwen3.5-fp4-gb300-dynamo-sglang
+  description:
+    - "Bump the Qwen3.5 FP4 GB300 disaggregated Dynamo-SGLang image from lmsysorg/sglang:v0.5.14-cu130 to lmsysorg/sglang:v0.5.19-cu130."
+    - "Pin Dynamo 1.5.0.dev20260908 in the four 8k1k STP recipes (and the family's router metadata) because Dynamo 1.1.0 imports sglang.srt.server_args_config_parser, which sglang v0.5.19 moved to sglang.srt.utils.server_args_config_parser; no stable Dynamo release carries the compat shim yet."
+    - "Model, topology, concurrency lists, workloads and recipe references are unchanged."
+  pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/2909