diff --git a/CHANGELOG.md b/CHANGELOG.md
index eaf6dcc39..32b1bdd06 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+## 1.91.0
+
+* **Potentially breaking change:** `meta.inspect()` (as well as other systems
+  that use it such as `@debug` and certain error messages) now emits numbers
+  with as high precision as is available instead of rounding to the nearest
+  1e⁻¹⁰ as we do when serializing to CSS. This better fits the purpose of
+  `meta.inspect()`, which is to provide full information about the structure of
+  a Sass value.
+
 ## 1.90.0
 
 * Allow a `@forward`ed module to be loaded with a configuration when that module
diff --git a/lib/src/functions/color.dart b/lib/src/functions/color.dart
index 1cb3640c0..afffa341d 100644
--- a/lib/src/functions/color.dart
+++ b/lib/src/functions/color.dart
@@ -170,7 +170,7 @@ final global = UnmodifiableListView([
     warnForDeprecation(
       "adjust-hue() is deprecated. Suggestion:\n"
       "\n"
-      "color.adjust(\$color, \$hue: $suggestedValue)\n"
+      "color.adjust(\$color, \$hue: ${suggestedValue.toCssString()})\n"
       "\n"
       "More info: https://sass-lang.com/d/color-functions",
       Deprecation.colorFunctions,
@@ -2019,7 +2019,7 @@ String _suggestScaleAndAdjust(
     var factorNumber = SassNumber(factor * 100, '%');
     suggestion += "s:\n"
         "\n"
-        "color.scale(\$color, \$$channelName: $factorNumber)\n";
+        "color.scale(\$color, \$$channelName: ${factorNumber.toCssString()})\n";
   } else {
     suggestion += ":\n\n";
   }
@@ -2028,7 +2028,8 @@ String _suggestScaleAndAdjust(
     adjustment,
     channel == ColorChannel.alpha ? null : '%',
   );
-  return suggestion + "color.adjust(\$color, \$$channelName: $difference)";
+  return suggestion +
+      "color.adjust(\$color, \$$channelName: ${difference.toCssString()})";
 }
 
 /// Throws an error indicating that a missing channel named [name] can't be
@@ -2037,7 +2038,7 @@ Never _missingChannelError(SassColor color, String channel) =>
     throw SassScriptException(
       "Because the CSS working group is still deciding on the best behavior, "
       "Sass doesn't currently support modifying missing channels (color: "
-      "$color).",
+      "${color.toCssString()}).",
       channel,
     );
 
diff --git a/lib/src/visitor/serialize.dart b/lib/src/visitor/serialize.dart
index 2856a24fa..f0a1908ef 100644
--- a/lib/src/visitor/serialize.dart
+++ b/lib/src/visitor/serialize.dart
@@ -1192,7 +1192,10 @@ final class _SerializeVisitor
 
     // Dart always converts integers to strings in the obvious way, so all we
     // have to do is clamp doubles that are close to being integers.
-    if (fuzzyAsInt(number) case var integer?) {
+    if (fuzzyAsInt(number) case var integer?
+        // In inspect mode, we want to show the full precision of every number,
+        // so we only write them as integers when they're precisely equal.
+        when !_inspect || number == integer) {
       // JS still uses exponential notation for integers, so we have to handle
       // it here.
       buffer.write(_removeExponent(integer.toString()));
@@ -1201,6 +1204,12 @@ final class _SerializeVisitor
 
     var text = _removeExponent(number.toString());
 
+    // Write the number at full precision in inspect mode.
+    if (_inspect) {
+      buffer.write(text);
+      return;
+    }
+
     // Any double that's less than `SassNumber.precision + 2` digits long is
     // guaranteed to be safe to emit directly, since it'll contain at most `0.`
     // followed by [SassNumber.precision] digits.
diff --git a/pkg/sass-parser/CHANGELOG.md b/pkg/sass-parser/CHANGELOG.md
index 1c1862ee3..73013a86a 100644
--- a/pkg/sass-parser/CHANGELOG.md
+++ b/pkg/sass-parser/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.4.26
+
+* No user-visible changes.
+
 ## 0.4.25
 
 * No user-visible changes.
diff --git a/pkg/sass-parser/package.json b/pkg/sass-parser/package.json
index bc75673cc..8da5ff799 100644
--- a/pkg/sass-parser/package.json
+++ b/pkg/sass-parser/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-parser",
-  "version": "0.4.25",
+  "version": "0.4.26",
   "description": "A PostCSS-compatible wrapper of the official Sass parser",
   "repository": "sass/sass",
   "author": "Google Inc.",
diff --git a/pkg/sass_api/CHANGELOG.md b/pkg/sass_api/CHANGELOG.md
index aed8ba3e8..2357c7988 100644
--- a/pkg/sass_api/CHANGELOG.md
+++ b/pkg/sass_api/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 15.9.0
+
+* No user-visible changes.
+
 ## 15.8.0
 
 * No user-visible changes.
diff --git a/pkg/sass_api/pubspec.yaml b/pkg/sass_api/pubspec.yaml
index 729f75849..ca8c298cb 100644
--- a/pkg/sass_api/pubspec.yaml
+++ b/pkg/sass_api/pubspec.yaml
@@ -2,7 +2,7 @@ name: sass_api
 # Note: Every time we add a new Sass AST node, we need to bump the *major*
 # version because it's a breaking change for anyone who's implementing the
 # visitor interface(s).
-version: 15.8.0
+version: 15.9.0
 description: Additional APIs for Dart Sass.
 homepage: https://github.com/sass/dart-sass
 
@@ -10,7 +10,7 @@ environment:
   sdk: ">=3.6.0 <4.0.0"
 
 dependencies:
-  sass: 1.90.0
+  sass: 1.91.0
 
 dev_dependencies:
   dartdoc: ^8.0.14
diff --git a/pubspec.yaml b/pubspec.yaml
index 41e3a07bc..efbcd7329 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: sass
-version: 1.90.0
+version: 1.91.0
 description: A Sass implementation in Dart.
 homepage: https://github.com/sass/dart-sass