diff --git a/CHANGELOG.md b/CHANGELOG.md
index ec9d7d5..3d43a26 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,13 @@ All notable changes to this project are documented here. The format follows
 
 ## [Unreleased]
 
+## [0.3.1] - 2026-07-20
+
+### Fixed
+- Agendula no longer crashes on launch. Every 0.3.0 install was affected: the
+  release build stripped a constructor that the background-work scheduler needs
+  to open its database, and that happens before the app draws anything.
+
 ## [0.3.0] - 2026-07-19
 
 ### Added
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 0a2fc28..557e4e7 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -29,8 +29,8 @@ android {
         // release itself (versionCode is pinned to MAJOR*10000 + MINOR*100 +
         // PATCH from versionName, e.g. 0.2.0 -> 200). The Gitea release is marked
         // as a pre-release while MAJOR is 0. See docs/RELEASING.md.
-        versionCode = 300
-        versionName = "0.3.0"
+        versionCode = 301
+        versionName = "0.3.1"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index dccc1da..d4314e3 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -2,5 +2,20 @@
 -keep class dagger.hilt.** { *; }
 -keep @dagger.hilt.android.HiltAndroidApp class *
 
+# Room instantiates its generated <Database>_Impl reflectively through a no-arg
+# constructor. R8 under AGP 9 keeps the class but prunes that constructor, since
+# nothing calls it directly — Room then throws InstantiationException, reported
+# as "Failed to create an instance of ...". We pull Room in transitively via
+# Glance -> WorkManager, whose WorkDatabase is built by WorkManagerInitializer
+# at startup, so the app died on launch in every minified build (issue #1).
+-keep class * extends androidx.room.RoomDatabase { <init>(); }
+
+# WorkManager likewise looks its workers up by name and calls this constructor
+# reflectively — same pruning, but it only bites once a worker actually runs
+# (Glance's widget updates), so keep it explicitly rather than wait for it.
+-keep class * extends androidx.work.ListenableWorker {
+    <init>(android.content.Context, androidx.work.WorkerParameters);
+}
+
 # Compose Compiler may keep its own; defaults are fine
 -dontwarn org.jetbrains.annotations.**
diff --git a/fastlane/metadata/android/en-US/changelogs/301.txt b/fastlane/metadata/android/en-US/changelogs/301.txt
new file mode 100644
index 0000000..9bfebc3
--- /dev/null
+++ b/fastlane/metadata/android/en-US/changelogs/301.txt
@@ -0,0 +1,5 @@
+### Fixed
+- Agendula no longer crashes on launch. Every 0.3.0 install was affected: the
+  release build stripped a constructor that the background-work scheduler needs
+  to open its database, and that happens before the app draws anything.
+