diff --git a/.github/workflows/go-ci.yaml b/.github/workflows/go-ci.yaml
index 09883eb..da1482a 100644
--- a/.github/workflows/go-ci.yaml
+++ b/.github/workflows/go-ci.yaml
@@ -7,28 +7,28 @@ on:
     branches: [ main ]
 
 env:
-  GO_VERSION: '1.27.1'
+  GO_VERSION: '1.27.3'
 
 jobs:
   # Lint job
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-go@v6
+      - uses: actions/checkout@v7
+      - uses: actions/setup-go@v7
         with:
           go-version: ${{ env.GO_VERSION }}
       - uses: golangci/golangci-lint-action@v9
         with:
-          version: v2.13.2
+          version: v2.15.0
           args: --timeout 5m
 
   # Test job
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-go@v6
+      - uses: actions/checkout@v7
+      - uses: actions/setup-go@v7
         with:
           go-version: ${{ env.GO_VERSION }}
       - run: go test ./... -v
@@ -37,13 +37,13 @@ jobs:
   security:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-go@v6
+      - uses: actions/checkout@v7
+      - uses: actions/setup-go@v7
         with:
           go-version: ${{ env.GO_VERSION }}
       # gosec is installed rather than run as its container action: the
       # published image ships its own Go, which lags behind and fails to load
       # the module ("go.mod requires go >= X"). Installing it here builds gosec
       # with the toolchain above, so CI's Go version is ours to choose.
-      - run: go install github.com/securego/gosec/v2/cmd/gosec@v2.29.0
+      - run: go install github.com/securego/gosec/v2/cmd/gosec@v2.30.0
       - run: gosec ./...
diff --git a/Dockerfile b/Dockerfile
index 6300eb7..7ce5aac 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -18,7 +18,7 @@ RUN go mod download
 COPY . .
 
 # Build the application
-RUN CGO_ENABLED=1 GOOS=linux go build -a -installsuffix cgo -o telegram-bot .
+RUN CGO_ENABLED=1 GOOS=linux go build -o telegram-bot .
 
 # Runtime stage
 FROM alpine:latest
diff --git a/README.md b/README.md
index cd7cc93..12cbabc 100644
--- a/README.md
+++ b/README.md
@@ -40,12 +40,7 @@ A scalable, multi-bot solution for Telegram using Go, GORM, and the Anthropic AP
 
 ### Native Deployment
 
-1. Install using `go get`:
-
-   ```bash
-   go get -u github.com/HugeFrog24/go-telegram-bot
-   cd go-telegram-bot
-   ```
+1. Clone the repository as above. Building needs Go 1.27 or later and a C compiler, because the SQLite driver uses cgo.
 
 2. Configure as above, then build:
    ```bash
@@ -73,10 +68,11 @@ Each bot is one JSON file in `config/` (see `config/default.json` for the templa
 
 | Key                | Type   | Default     | Description |
 | ------------------ | ------ | ----------- | ----------- |
-| `max_tokens`       | number | `1000`      | Maximum output tokens per reply. **Thinking tokens count toward this limit** — raise it (e.g. `4000`+) whenever `thinking` is `"adaptive"`, or a turn can spend the whole budget on reasoning and produce no text. |
+| `max_tokens`       | number | `1000`      | Maximum output tokens per reply. **Thinking tokens count toward this limit** — raise it (e.g. `4000`+) whenever `thinking` is `"adaptive"`, or a turn can spend the whole budget on reasoning and produce no text. Claude 5-generation models (Haiku 5.5, Sonnet 5 and later, Opus 5 and later, Fable) think even when `thinking` is omitted; on those, keep `effort` low or raise this limit. |
+| `temperature`      | number | *(ignored)* | No longer sent: since API version `2026-10-21` the Claude API rejects `temperature`, `top_p` and `top_k` on every model. Old configs still load, and the bot logs a startup notice; remove the key. |
 | `thinking`         | string | *(omitted)* | Reasoning mode: `"adaptive"` (the model decides when and how much to think) or `"disabled"`. Omit the key entirely to use the model's own API default. If the configured model doesn't support the chosen mode, the API rejects the request with a 400 — owners/admins see the raw error, regular users get the generic fallback. Check [Anthropic's model docs](https://platform.claude.com/docs/en/build-with-claude/adaptive-thinking) for per-model support. |
 | `thinking_display` | string | *(omitted)* | `"summarized"` or `"omitted"`. Only valid together with `"thinking": "adaptive"`. Controls whether the API returns a readable summary of the reasoning (logged, never sent to chat). Thinking is billed the same either way; when omitted, the API's per-model default applies. |
-| `effort`           | string | *(omitted)* | `"low"`, `"medium"`, `"high"`, `"xhigh"` or `"max"`. Caps how much reasoning and token spend a turn may use; the API default is `high`. For short-reply chat bots `"low"` or `"medium"` cuts cost noticeably. Rejected with a 400 on models older than Claude 4.6 (Haiku 4.5, Sonnet 4.5) — omit it there. |
+| `effort`           | string | *(omitted)* | `"low"`, `"medium"`, `"high"`, `"xhigh"` or `"max"`. Caps how much reasoning and token spend a turn may use; the API default is `high` on most models and `medium` on Haiku 5.5 and Opus 5.5. For short-reply chat bots `"low"` or `"medium"` cuts cost noticeably. Rejected with a 400 on models older than Claude 4.6 (Haiku 4.5, Sonnet 4.5) — omit it there. |
 | `debounce_ms`      | number | *(omitted)* | Quiet window, in milliseconds, for coalescing rapid follow-up messages into a single turn. Omit or set `0` to disable. See [Coalescing rapid messages](#coalescing-rapid-messages) below. |
 | `stream_drafts`    | bool   | `false`     | Streams each reply into one Telegram draft that grows in place, with a native Stop button, and sends it as a single message when done. Private chats only. See [Draft streaming and the Stop button](#draft-streaming-and-the-stop-button) below. |
 | `cache_history`    | bool   | `true`      | Places a prompt-cache breakpoint on the trailing conversation block, so each turn reads the prior history from cache instead of reprocessing it at full price. Set `false` to cache only the system prompt. |
diff --git a/anthropic.go b/anthropic.go
index 47da324..9263481 100644
--- a/anthropic.go
+++ b/anthropic.go
@@ -9,8 +9,8 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/anthropics/anthropic-sdk-go"
-	"github.com/anthropics/anthropic-sdk-go/packages/param"
+	"github.com/anthropics/anthropic-sdk-go/v2"
+	"github.com/anthropics/anthropic-sdk-go/v2/packages/param"
 )
 
 var ErrModelNotFound = errors.New("model not found or deprecated")
@@ -58,10 +58,6 @@ func (b *Bot) getAnthropicResponse(ctx context.Context, chatID int64, messages [
 		params.System = blocks
 	}
 
-	if b.config.Temperature != nil {
-		params.Temperature = param.NewOpt(float64(*b.config.Temperature))
-	}
-
 	if thinking, ok := thinkingParamFromConfig(b.config.Thinking, b.config.ThinkingDisplay); ok {
 		params.Thinking = thinking
 	}
@@ -159,7 +155,7 @@ func (b *Bot) getAnthropicResponse(ctx context.Context, chatID int64, messages [
 	}
 
 	if full == "" {
-		return "", emptyStreamError(string(lastMsg.StopReason),
+		return "", emptyStreamError(string(lastMsg.StopReason), string(lastMsg.StopDetails.Category),
 			lastMsg.Usage.OutputTokensDetails.ThinkingTokens, params.MaxTokens)
 	}
 	return full, nil
@@ -466,10 +462,16 @@ func joinNonEmpty(a, b string) string {
 	}
 }
 
-func emptyStreamError(stopReason string, thinkingTokens, maxTokens int64) error {
-	if stopReason == "max_tokens" {
+func emptyStreamError(stopReason, refusalCategory string, thinkingTokens, maxTokens int64) error {
+	switch stopReason {
+	case "max_tokens":
 		return fmt.Errorf("output budget exhausted before any text (thinking used %d of %d max_tokens) - raise max_tokens",
 			thinkingTokens, maxTokens)
+	case "refusal":
+		if refusalCategory == "" {
+			return fmt.Errorf("the model declined the request (refusal)")
+		}
+		return fmt.Errorf("the model declined the request (refusal, category %s)", refusalCategory)
 	}
 	return fmt.Errorf("unexpected response format from Anthropic")
 }
diff --git a/anthropic_files.go b/anthropic_files.go
index 79ed408..41ab201 100644
--- a/anthropic_files.go
+++ b/anthropic_files.go
@@ -9,7 +9,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/anthropics/anthropic-sdk-go"
+	"github.com/anthropics/anthropic-sdk-go/v2"
 )
 
 const fileNotFoundPrefix = "File not found: "
diff --git a/anthropic_test.go b/anthropic_test.go
index 207a967..ec597ba 100644
--- a/anthropic_test.go
+++ b/anthropic_test.go
@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/anthropics/anthropic-sdk-go"
+	"github.com/anthropics/anthropic-sdk-go/v2"
 )
 
 func TestTimeContextFor(t *testing.T) {
@@ -295,16 +295,22 @@ func TestFetchHosts(t *testing.T) {
 }
 
 func TestEmptyStreamError(t *testing.T) {
-	err := emptyStreamError("max_tokens", 3900, 4000)
+	err := emptyStreamError("max_tokens", "", 3900, 4000)
 	for _, want := range []string{"output budget exhausted", "3900", "4000"} {
 		if !strings.Contains(err.Error(), want) {
 			t.Errorf("max_tokens case: %q missing %q", err.Error(), want)
 		}
 	}
-	if got := emptyStreamError("end_turn", 0, 1000).Error(); got != "unexpected response format from Anthropic" {
+	if got := emptyStreamError("refusal", "cyber", 0, 1000).Error(); got != "the model declined the request (refusal, category cyber)" {
+		t.Errorf("refusal case = %q", got)
+	}
+	if got := emptyStreamError("refusal", "", 0, 1000).Error(); got != "the model declined the request (refusal)" {
+		t.Errorf("uncategorized refusal case = %q", got)
+	}
+	if got := emptyStreamError("end_turn", "", 0, 1000).Error(); got != "unexpected response format from Anthropic" {
 		t.Errorf("generic case = %q", got)
 	}
-	if got := emptyStreamError("", 0, 1000).Error(); got != "unexpected response format from Anthropic" {
+	if got := emptyStreamError("", "", 0, 1000).Error(); got != "unexpected response format from Anthropic" {
 		t.Errorf("no-stop-reason case = %q", got)
 	}
 }
diff --git a/bot.go b/bot.go
index 2264930..2754e3e 100644
--- a/bot.go
+++ b/bot.go
@@ -8,8 +8,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/anthropics/anthropic-sdk-go"
-	"github.com/anthropics/anthropic-sdk-go/option"
+	"github.com/anthropics/anthropic-sdk-go/v2"
+	"github.com/anthropics/anthropic-sdk-go/v2/option"
 	"github.com/go-telegram/bot"
 	"github.com/go-telegram/bot/models"
 	"gorm.io/gorm"
@@ -83,7 +83,13 @@ func NewBot(db *gorm.DB, config BotConfig, clock Clock, tgClient TelegramClient)
 		return nil, err
 	}
 
-	anthropicClient := anthropic.NewClient(option.WithAPIKey(config.AnthropicAPIKey))
+	// An explicitly passed credential is used as is, so an empty key would go
+	// out as an empty bearer token; leave it out to use the SDK's default chain.
+	var anthropicOpts []option.RequestOption
+	if config.AnthropicAPIKey != "" {
+		anthropicOpts = append(anthropicOpts, option.WithAPIKey(config.AnthropicAPIKey))
+	}
+	anthropicClient := anthropic.NewClient(anthropicOpts...)
 
 	b := &Bot{
 		db:              db,
@@ -339,10 +345,9 @@ func (b *Bot) buildContextMessages(chatMemory *ChatMemory) []anthropic.BetaMessa
 		if msg.IsUser {
 			param = anthropic.NewBetaUserMessage(blocks...)
 		} else {
-			param = anthropic.BetaMessageParam{
-				Role:    anthropic.BetaMessageParamRoleAssistant,
+			param = anthropic.BetaMessageParam{OfAssistant: &anthropic.BetaAssistantMessageParam{
 				Content: blocks,
-			}
+			}}
 		}
 		contextMessages = append(contextMessages, param)
 	}
@@ -366,7 +371,13 @@ func markTrailingCacheBreakpoint(messages []anthropic.BetaMessageParam) {
 	if len(messages) == 0 {
 		return
 	}
-	blocks := messages[len(messages)-1].Content
+	var blocks []anthropic.BetaContentBlockParamUnion
+	switch last := messages[len(messages)-1]; {
+	case last.OfUser != nil:
+		blocks = last.OfUser.Content
+	case last.OfAssistant != nil:
+		blocks = last.OfAssistant.Content
+	}
 	if len(blocks) == 0 {
 		return
 	}
diff --git a/config.go b/config.go
index d396a2f..f48eca5 100644
--- a/config.go
+++ b/config.go
@@ -76,7 +76,7 @@ type BotConfig struct {
 	MessagePerDay     int               `json:"messages_per_day"`
 	TempBanDuration   string            `json:"temp_ban_duration"`
 	Model             string            `json:"model"`
-	Temperature       *float32          `json:"temperature,omitempty"`
+	Temperature       *float32          `json:"temperature,omitempty"` // never sent (rejected since API 2026-10-21); parsed only to flag stale configs
 	MaxTokens         int               `json:"max_tokens,omitempty"`
 	Thinking          string            `json:"thinking,omitempty"`
 	ThinkingDisplay   string            `json:"thinking_display,omitempty"`
@@ -175,6 +175,11 @@ func loadAllConfigs(dir string) ([]BotConfig, error) {
 // logConfigAdvisories emits non-fatal boot-time notes about settings that are
 // valid but likely to surprise: silently ineffective, or costlier than intended.
 func logConfigAdvisories(config *BotConfig) {
+	if config.Temperature != nil {
+		InfoLogger.Printf("[%s] temperature=%g is ignored: the Claude API no longer accepts sampling parameters; remove the key",
+			config.ID, *config.Temperature)
+	}
+
 	if config.Thinking == ThinkingModeAdaptive && config.MaxTokens > 0 && config.MaxTokens < 4000 {
 		InfoLogger.Printf("[%s] thinking=adaptive with max_tokens=%d: thinking tokens count toward max_tokens; consider >= 4000",
 			config.ID, config.MaxTokens)
diff --git a/config/default.json b/config/default.json
index 2a3c5dc..9a9e62e 100644
--- a/config/default.json
+++ b/config/default.json
@@ -11,9 +11,9 @@
     "messages_per_hour": 20,
     "messages_per_day": 100,
     "temp_ban_duration": "24h",
-    "model": "claude-haiku-4-5",
-    "temperature": 0.7,
+    "model": "claude-haiku-5-5",
     "max_tokens": 1000,
+    "effort": "low",
     "debounce_ms": 2500,
     "debug_screening": false,
     "system_prompts": {
diff --git a/elevenlabs.go b/elevenlabs.go
index 705857f..05da21b 100644
--- a/elevenlabs.go
+++ b/elevenlabs.go
@@ -56,7 +56,7 @@ func (b *Bot) transcribeVoice(ctx context.Context, fileID string) (string, error
 
 	var buf bytes.Buffer
 	mw := multipart.NewWriter(&buf)
-	if err := mw.WriteField("model_id", "scribe_v1"); err != nil {
+	if err := mw.WriteField("model_id", "scribe_v2"); err != nil {
 		return "", fmt.Errorf("multipart write error: %w", err)
 	}
 	part, err := mw.CreateFormFile("file", "audio.ogg")
diff --git a/go.mod b/go.mod
index 9a82bf6..8b16c51 100644
--- a/go.mod
+++ b/go.mod
@@ -1,12 +1,12 @@
 module github.com/HugeFrog24/go-telegram-bot
 
-go 1.26.0
+go 1.27.0
 
 require (
-	github.com/anthropics/anthropic-sdk-go v1.71.0
-	github.com/go-telegram/bot v1.25.0
+	github.com/anthropics/anthropic-sdk-go/v2 v2.3.0
+	github.com/go-telegram/bot v1.27.0
 	github.com/stretchr/testify v1.12.1
-	golang.org/x/sync v0.23.0
+	golang.org/x/sync v0.24.0
 	golang.org/x/time v0.16.0
 	gorm.io/driver/sqlite v1.6.0
 	gorm.io/gorm v1.31.2
@@ -15,18 +15,26 @@ require (
 require (
 	github.com/bahlo/generic-list-go v0.2.0 // indirect
 	github.com/buger/jsonparser v1.6.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/go-logr/logr v1.4.4 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/invopop/jsonschema v0.14.0 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
 	github.com/mattn/go-sqlite3 v1.14.52 // indirect
-	github.com/pb33f/ordered-map/v2 v2.3.1 // indirect
+	github.com/pb33f/go-yaml v0.1.1 // indirect
+	github.com/pb33f/ordered-map/v2 v2.3.2 // indirect
 	github.com/standard-webhooks/standard-webhooks/libraries v0.0.1 // indirect
-	github.com/stretchr/objx v0.5.3 // indirect
-	github.com/tidwall/gjson v1.19.0 // indirect
+	github.com/stretchr/objx v0.8.0 // indirect
+	github.com/tidwall/gjson v1.20.0 // indirect
 	github.com/tidwall/match v1.2.0 // indirect
-	github.com/tidwall/pretty v1.2.1 // indirect
+	github.com/tidwall/pretty v1.2.2 // indirect
 	github.com/tidwall/sjson v1.2.5 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/otel v1.47.0 // indirect
+	go.opentelemetry.io/otel/log v1.47.0 // indirect
+	go.opentelemetry.io/otel/metric v1.47.0 // indirect
+	go.opentelemetry.io/otel/trace v1.47.0 // indirect
 	go.yaml.in/yaml/v3 v3.0.5 // indirect
-	go.yaml.in/yaml/v4 v4.0.0-rc.6 // indirect
-	golang.org/x/text v0.42.0 // indirect
+	golang.org/x/text v0.43.0 // indirect
 )
diff --git a/go.sum b/go.sum
index 88ce414..a7d1aba 100644
--- a/go.sum
+++ b/go.sum
@@ -1,13 +1,70 @@
-github.com/anthropics/anthropic-sdk-go v1.71.0 h1:DK9xG3s5t+xUIOp+R+1LIRjkU/wG57YyQO3630+gYOE=
-github.com/anthropics/anthropic-sdk-go v1.71.0/go.mod h1:x+lPk/cCl48uRegeP0hlYYBN1b7bEBTveInIMgLicnY=
+cloud.google.com/go/auth v0.7.2 h1:uiha352VrCDMXg+yoBtaD0tUF4Kv9vrtrWPYXwutnDE=
+cloud.google.com/go/auth v0.7.2/go.mod h1:VEc4p5NNxycWQTMQEDQF0bd6aTMb6VgYDXEwiJJQAbs=
+cloud.google.com/go/auth/oauth2adapt v0.2.3 h1:MlxF+Pd3OmSudg/b1yZ5lJwoXCEaeedAguodky1PcKI=
+cloud.google.com/go/auth/oauth2adapt v0.2.3/go.mod h1:tMQXOfZzFuNuUxOypHlQEXgdfX5cuhwU+ffUuXRJE8I=
+cloud.google.com/go/compute/metadata v0.5.0 h1:Zr0eK8JbFv6+Wi4ilXAR8FJ3wyNdpxHKJNPos6LTZOY=
+cloud.google.com/go/compute/metadata v0.5.0/go.mod h1:aHnloV2TPI38yx4s9+wAZhHykWvVCfu7hQbF+9CWoiY=
+github.com/anthropics/anthropic-sdk-go/v2 v2.3.0 h1:wEaN13ToNCcjdqP+47ALC78Jt+DkGMmwqL5zzPQTGkQ=
+github.com/anthropics/anthropic-sdk-go/v2 v2.3.0/go.mod h1:LAOInMKgn6reTIrPvKXa5weyqzxsJkxSBuzhnxzukpQ=
+github.com/aws/aws-sdk-go-v2 v1.38.0 h1:UCRQ5mlqcFk9HJDIqENSLR3wiG1VTWlyUfLDEvY7RxU=
+github.com/aws/aws-sdk-go-v2 v1.38.0/go.mod h1:9Q0OoGQoboYIAJyslFyF1f5K1Ryddop8gqMhWx/n4Wg=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.3 h1:tW1/Rkad38LA15X4UQtjXZXNKsCgkshC3EbmcUmghTg=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.3/go.mod h1:UbnqO+zjqk3uIt9yCACHJ9IVNhyhOCnYk8yA19SAWrM=
+github.com/aws/aws-sdk-go-v2/config v1.27.27 h1:HdqgGt1OAP0HkEDDShEl0oSYa9ZZBSOmKpdpsDMdO90=
+github.com/aws/aws-sdk-go-v2/config v1.27.27/go.mod h1:MVYamCg76dFNINkZFu4n4RjDixhVr51HLj4ErWzrVwg=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.27 h1:2raNba6gr2IfA0eqqiP2XiQ0UVOpGPgDSi0I9iAP+UI=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.27/go.mod h1:gniiwbGahQByxan6YjQUMcW4Aov6bLC3m+evgcoN4r4=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.11 h1:KreluoV8FZDEtI6Co2xuNk/UqI9iwMrOx/87PBNIKqw=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.11/go.mod h1:SeSUYBLsMYFoRvHE0Tjvn7kbxaUhl75CJi1sbfhMxkU=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.15 h1:SoNJ4RlFEQEbtDcCEt+QG56MY4fm4W8rYirAmq+/DdU=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.15/go.mod h1:U9ke74k1n2bf+RIgoX1SXFed1HLs51OgUSs+Ph0KJP8=
+github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.15 h1:C6WHdGnTDIYETAm5iErQUiVNsclNx9qbJVPIt03B6bI=
+github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.15/go.mod h1:ZQLZqhcu+JhSrA9/NXRm8SkDvsycE+JkV3WGY41e+IM=
+github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0 h1:hT8rVHwugYE2lEfdFE0QWVo81lF7jMrYJVDWI+f+VxU=
+github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0/go.mod h1:8tu/lYfQfFe6IGnaOdrpVgEL2IrrDOf6/m9RQum4NkY=
+github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.3 h1:dT3MqvGhSoaIhRseqw2I0yH81l7wiR2vjs57O51EAm8=
+github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.3/go.mod h1:GlAeCkHwugxdHaueRr4nhPuY+WW+gR8UjlcqzPr1SPI=
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diff --git a/handlers.go b/handlers.go
index ac71395..8467286 100644
--- a/handlers.go
+++ b/handlers.go
@@ -7,7 +7,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/anthropics/anthropic-sdk-go"
+	"github.com/anthropics/anthropic-sdk-go/v2"
 	"github.com/go-telegram/bot"
 	"github.com/go-telegram/bot/models"
 	"golang.org/x/sync/errgroup"
diff --git a/prompt_cache_test.go b/prompt_cache_test.go
index 443e44f..cc9ea9d 100644
--- a/prompt_cache_test.go
+++ b/prompt_cache_test.go
@@ -3,8 +3,8 @@ package main
 import (
 	"testing"
 
-	"github.com/anthropics/anthropic-sdk-go"
-	"github.com/anthropics/anthropic-sdk-go/packages/param"
+	"github.com/anthropics/anthropic-sdk-go/v2"
+	"github.com/anthropics/anthropic-sdk-go/v2/packages/param"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -21,14 +21,14 @@ func TestMarkTrailingCacheBreakpoint(t *testing.T) {
 
 		markTrailingCacheBreakpoint(msgs)
 
-		last := msgs[1].Content[1].OfText
+		last := msgs[1].OfUser.Content[1].OfText
 		require.NotNil(t, last)
 		assert.False(t, param.IsOmitted(last.CacheControl),
 			"the trailing block carries the breakpoint")
 
 		// Everything earlier stays unmarked: one breakpoint, not one per block.
-		assert.True(t, param.IsOmitted(msgs[1].Content[0].OfText.CacheControl))
-		assert.True(t, param.IsOmitted(msgs[0].Content[0].OfText.CacheControl))
+		assert.True(t, param.IsOmitted(msgs[1].OfUser.Content[0].OfText.CacheControl))
+		assert.True(t, param.IsOmitted(msgs[0].OfUser.Content[0].OfText.CacheControl))
 	})
 
 	t.Run("marks a trailing image block", func(t *testing.T) {
@@ -40,8 +40,8 @@ func TestMarkTrailingCacheBreakpoint(t *testing.T) {
 
 		markTrailingCacheBreakpoint(msgs)
 
-		require.NotNil(t, msgs[0].Content[0].OfImage)
-		assert.False(t, param.IsOmitted(msgs[0].Content[0].OfImage.CacheControl))
+		require.NotNil(t, msgs[0].OfUser.Content[0].OfImage)
+		assert.False(t, param.IsOmitted(msgs[0].OfUser.Content[0].OfImage.CacheControl))
 	})
 
 	t.Run("tolerates empty input", func(t *testing.T) {
@@ -65,7 +65,9 @@ func TestPrepareContextMessages_CacheHistoryToggle(t *testing.T) { //NOSONAR go:
 	t.Run("enabled by default", func(t *testing.T) {
 		msgs := b.prepareContextMessages(memory)
 		require.Len(t, msgs, 2)
-		assert.False(t, param.IsOmitted(msgs[1].Content[0].OfText.CacheControl))
+		require.NotNil(t, msgs[0].OfUser, "user memory becomes a user turn")
+		require.NotNil(t, msgs[1].OfAssistant, "bot memory becomes an assistant turn")
+		assert.False(t, param.IsOmitted(msgs[1].OfAssistant.Content[0].OfText.CacheControl))
 	})
 
 	t.Run("opt-out leaves history unmarked", func(t *testing.T) {
@@ -75,7 +77,7 @@ func TestPrepareContextMessages_CacheHistoryToggle(t *testing.T) { //NOSONAR go:
 
 		msgs := b.prepareContextMessages(memory)
 		require.Len(t, msgs, 2)
-		assert.True(t, param.IsOmitted(msgs[1].Content[0].OfText.CacheControl))
+		assert.True(t, param.IsOmitted(msgs[1].OfAssistant.Content[0].OfText.CacheControl))
 	})
 }