diff --git a/.hlint.yaml b/.hlint.yaml
--- a/.hlint.yaml
+++ b/.hlint.yaml
@@ -534,86 +534,14 @@
     - message: "Partial: throws on empty Seq."
       name: Data.Sequence.scanr1
       within: []
-- hint:
-    lhs: Data.Text.pack
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.unpack
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Lazy.pack
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Lazy.unpack
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Lazy.toStrict
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Lazy.fromStrict
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Encoding.encodeUtf8
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Encoding.decodeUtf8
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Lazy.Encoding.encodeUtf8
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Lazy.Encoding.decodeUtf8
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.ByteString.pack
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.ByteString.unpack
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.ByteString.Lazy.pack
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.ByteString.Lazy.unpack
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.ByteString.Lazy.toStrict
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.ByteString.Lazy.fromStrict
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Lazy.Builder.fromText
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Lazy.Builder.fromLazyText
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Lazy.Builder.fromString
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
-- hint:
-    lhs: Data.Text.Lazy.Builder.toLazyText
-    note: Use convert from Data.Convertible for uniform type conversion
-    rhs: convert
+- functions:
+    - message: Use safeConvert from Data.Convertible to surface conversion errors as Either ConvertError instead of relying on a partial function
+      name: Data.Text.Encoding.decodeUtf8
+      within: []
+- functions:
+    - message: Use safeConvert from Data.Convertible to surface conversion errors as Either ConvertError instead of relying on a partial function
+      name: Data.Text.Lazy.Encoding.decodeUtf8
+      within: []
 - functions:
     - message: "Don't throw in pure code. Use throwM in MonadThrow context."
       name: throw
diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,21 @@
 
 ## [Unreleased]
 
+## [1.1.6.1] - 2026-07-27
+
+### Changed
+
+- Stop preferring `convert` over total functions
+  like `pack`, `unpack`, `toStrict`, `fromStrict`, `encodeUtf8`,
+  and lazy/strict `Builder` conversions,
+  because `convert` can be partial depending
+  on the `Convertible` instance and this project avoids partial functions
+- Warn against partial conversion functions like `decodeUtf8`
+  with a message that recommends `safeConvert` from `Data.Convertible`,
+  which returns `Either ConvertError` so the failure can be handled as a value
+  rather than thrown. The rule is a usage restriction rather than a hint,
+  since `safeConvert` is not a drop-in replacement (the return type changes)
+
 ## [1.1.6.0] - 2026-06-16
 
 ### Added
diff --git a/example/anomaly-monitor/Anomaly.hs b/example/anomaly-monitor/Anomaly.hs
--- a/example/anomaly-monitor/Anomaly.hs
+++ b/example/anomaly-monitor/Anomaly.hs
@@ -5,6 +5,7 @@
   , formatReport
   ) where
 
+import Data.Text qualified as T
 import Himari
 
 -- | Severity level of detected anomaly.
@@ -39,11 +40,11 @@
   mconcat
     [ "[ANOMALY DETECTED] "
     , "Severity: "
-    , convert $ show report.severity
+    , T.pack $ show report.severity
     , " | CPU: "
-    , convert $ showFFloat (Just 1) report.cpuUsage "%"
+    , T.pack $ showFFloat (Just 1) report.cpuUsage "%"
     , " (threshold: "
-    , convert $ showFFloat (Just 1) report.threshold "%"
+    , T.pack $ showFFloat (Just 1) report.threshold "%"
     , ") | Time: "
-    , convert $ formatTime defaultTimeLocale "%Y-%m-%d %H:%M:%S UTC" report.timestamp
+    , T.pack $ formatTime defaultTimeLocale "%Y-%m-%d %H:%M:%S UTC" report.timestamp
     ]
diff --git a/example/anomaly-monitor/Config.hs b/example/anomaly-monitor/Config.hs
--- a/example/anomaly-monitor/Config.hs
+++ b/example/anomaly-monitor/Config.hs
@@ -9,6 +9,7 @@
   , loadConfig
   ) where
 
+import Data.Text qualified as T
 import Exception
 import Himari
 
@@ -42,8 +43,8 @@
     logInfoN "No config file specified, using defaults"
     pure def
   Just path -> do
-    logInfoN $ "Loading config from: " <> convert path
+    logInfoN $ "Loading config from: " <> T.pack path
     contentEither <- liftIO $ eitherDecodeFileStrict path
     case contentEither of
-      Left exception -> throwM . ConfigDecodeException $ convert exception
+      Left exception -> throwM . ConfigDecodeException $ T.pack exception
       Right config' -> pure config'
diff --git a/example/anomaly-monitor/Cpu.hs b/example/anomaly-monitor/Cpu.hs
--- a/example/anomaly-monitor/Cpu.hs
+++ b/example/anomaly-monitor/Cpu.hs
@@ -81,7 +81,7 @@
   contentEither <- tryAny . liftIO $ T.readFile "/proc/stat"
   case contentEither of
     Left exception -> do
-      logWarnN $ "Failed to read /proc/stat: " <> convert (displayException exception)
+      logWarnN $ "Failed to read /proc/stat: " <> T.pack (displayException exception)
       pure Nothing
     Right content -> pure $ parseCpuStats content
 
@@ -91,9 +91,9 @@
   config' <- view config
   return $
     "Configuration: CPU threshold = "
-      <> convert (showFFloat (Just 1) (config' ^. cpuThreshold) "%")
+      <> T.pack (showFFloat (Just 1) (config' ^. cpuThreshold) "%")
       <> ", interval = "
-      <> convert (show $ config' ^. checkInterval)
+      <> T.pack (show $ config' ^. checkInterval)
       <> "s"
       <> ", max checks = "
-      <> convert (show $ config' ^. maxChecks)
+      <> T.pack (show $ config' ^. maxChecks)
diff --git a/example/anomaly-monitor/Loop.hs b/example/anomaly-monitor/Loop.hs
--- a/example/anomaly-monitor/Loop.hs
+++ b/example/anomaly-monitor/Loop.hs
@@ -5,6 +5,7 @@
 import Anomaly
 import Config
 import Cpu
+import Data.Text qualified as T
 import Env
 import Himari
 
@@ -37,7 +38,7 @@
         formattedReport <- mkFormattedReport usage cpuThreshold' severity'
         -- Log based on severity
         case severity' of
-          Normal -> logDebugN $ "System normal. CPU: " <> convert (showFFloat (Just 1) usage "%")
+          Normal -> logDebugN $ "System normal. CPU: " <> T.pack (showFFloat (Just 1) usage "%")
           Warning -> logWarnN formattedReport
           Critical -> logErrorN formattedReport
           Catastrophic -> logErrorN $ "!!! " <> formattedReport <> " !!!"
diff --git a/himari.cabal b/himari.cabal
--- a/himari.cabal
+++ b/himari.cabal
@@ -1,6 +1,6 @@
 cabal-version: 3.12
 name: himari
-version: 1.1.6.0
+version: 1.1.6.1
 synopsis: A standard library for Haskell as an alternative to rio
 description:
   A standard library for Haskell inspired by rio.
@@ -167,7 +167,7 @@
   build-depends:
     QuickCheck >=2.15.0.1 && <2.19,
     himari,
-    sydtest >=0.18.0.0 && <0.24,
+    sydtest >=0.18.0.0 && <0.28,
 
   build-tool-depends:
     hlint:hlint >=3.10 && <4