diff --git a/openhands-agent-server/openhands/agent_server/conversation_router_acp.py b/openhands-agent-server/openhands/agent_server/conversation_router_acp.py
index d1e48df1d6..d4795a4e09 100644
--- a/openhands-agent-server/openhands/agent_server/conversation_router_acp.py
+++ b/openhands-agent-server/openhands/agent_server/conversation_router_acp.py
@@ -50,7 +50,13 @@
         ),
     ).model_dump(exclude_defaults=True, mode="json"),
     StartACPConversationRequest(
-        agent=ACPAgent(acp_command=["npx", "-y", "claude-agent-acp"]),
+        agent=ACPAgent(
+            acp_command=[
+                "npx",
+                "-y",
+                "@agentclientprotocol/claude-agent-acp@0.30.0",
+            ]
+        ),
         workspace=LocalWorkspace(working_dir="workspace/project"),
         initial_message=SendMessageRequest(
             role="user",
diff --git a/openhands-agent-server/openhands/agent_server/docker/Dockerfile b/openhands-agent-server/openhands/agent_server/docker/Dockerfile
index d4b59784bb..2fdbada531 100644
--- a/openhands-agent-server/openhands/agent_server/docker/Dockerfile
+++ b/openhands-agent-server/openhands/agent_server/docker/Dockerfile
@@ -173,7 +173,7 @@ RUN set -ux; \
         if "$ACP_NODE_DIR/bin/npm" install -g \
             @agentclientprotocol/claude-agent-acp@0.30.0 \
             @zed-industries/codex-acp@0.11.1 \
-            @google/gemini-cli@0.38.0; then \
+            @google/gemini-cli@0.39.1; then \
           # Create wrappers in /usr/local/bin that prepend ACP's Node 22 to PATH.
           # This ensures the ACP binary's #!/usr/bin/env node shebang resolves
           # to Node 22, while the repo's own node (NVM/system) stays untouched
diff --git a/openhands-sdk/openhands/sdk/settings/acp_providers.py b/openhands-sdk/openhands/sdk/settings/acp_providers.py
index f29684d93d..39ca454a6e 100644
--- a/openhands-sdk/openhands/sdk/settings/acp_providers.py
+++ b/openhands-sdk/openhands/sdk/settings/acp_providers.py
@@ -194,12 +194,39 @@ class ACPProviderInfo:
 )
 
 
+# ---------------------------------------------------------------------------
+# Pinned npm versions for the built-in ACP launchers.
+#
+# These pair with the corresponding versions in
+# ``openhands-agent-server/openhands/agent_server/docker/Dockerfile`` so that
+# the version installed at image build time and the version launched at agent
+# runtime cannot diverge. Bumping these requires also bumping the Dockerfile
+# pins (and vice versa).
+#
+# Each provider runs with a permission-disabling default session mode, so the
+# floating ``npx -y <pkg>`` form (which would resolve npm's ``latest`` at
+# launch time, after commit and lock review) is intentionally avoided here.
+#
+# - ``CLAUDE_AGENT_ACP_VERSION``  — pairs with Dockerfile ``@...@0.30.0``
+# - ``CODEX_ACP_VERSION``         — pairs with Dockerfile ``@...@0.11.1``
+# - ``GEMINI_CLI_VERSION``        — bumped to a patched release (>= 0.39.1)
+# ---------------------------------------------------------------------------
+
+CLAUDE_AGENT_ACP_VERSION = "0.30.0"
+CODEX_ACP_VERSION = "0.11.1"
+GEMINI_CLI_VERSION = "0.39.1"
+
+
 ACP_PROVIDERS: Mapping[str, ACPProviderInfo] = MappingProxyType(
     {
         "claude-code": ACPProviderInfo(
             key="claude-code",
             display_name="Claude Code",
-            default_command=("npx", "-y", "@agentclientprotocol/claude-agent-acp"),
+            default_command=(
+                "npx",
+                "-y",
+                f"@agentclientprotocol/claude-agent-acp@{CLAUDE_AGENT_ACP_VERSION}",
+            ),
             api_key_env_var="ANTHROPIC_API_KEY",
             base_url_env_var="ANTHROPIC_BASE_URL",
             default_session_mode="bypassPermissions",
@@ -212,7 +239,11 @@ class ACPProviderInfo:
         "codex": ACPProviderInfo(
             key="codex",
             display_name="Codex",
-            default_command=("npx", "-y", "@zed-industries/codex-acp"),
+            default_command=(
+                "npx",
+                "-y",
+                f"@zed-industries/codex-acp@{CODEX_ACP_VERSION}",
+            ),
             api_key_env_var="OPENAI_API_KEY",
             base_url_env_var="OPENAI_BASE_URL",
             default_session_mode="full-access",
@@ -225,7 +256,12 @@ class ACPProviderInfo:
         "gemini-cli": ACPProviderInfo(
             key="gemini-cli",
             display_name="Gemini CLI",
-            default_command=("npx", "-y", "@google/gemini-cli", "--acp"),
+            default_command=(
+                "npx",
+                "-y",
+                f"@google/gemini-cli@{GEMINI_CLI_VERSION}",
+                "--acp",
+            ),
             api_key_env_var="GEMINI_API_KEY",
             base_url_env_var="GEMINI_BASE_URL",
             default_session_mode="yolo",
diff --git a/tests/sdk/test_settings.py b/tests/sdk/test_settings.py
index ff27ca5a1b..2fe683a6b9 100644
--- a/tests/sdk/test_settings.py
+++ b/tests/sdk/test_settings.py
@@ -559,7 +559,7 @@ def test_acp_create_agent_uses_server_default_command() -> None:
     assert agent.acp_command == [
         "npx",
         "-y",
-        "@agentclientprotocol/claude-agent-acp",
+        "@agentclientprotocol/claude-agent-acp@0.30.0",
     ]
     assert agent.acp_model == "claude-opus-4-6"