diff --git a/.version b/.version
index 7208c2182..f398a2061 100644
--- a/.version
+++ b/.version
@@ -1 +1 @@
-2.4
\ No newline at end of file
+3.0
\ No newline at end of file
diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc
index c88bb3c6d..3fa93e24d 100644
--- a/src/libstore/derivations.cc
+++ b/src/libstore/derivations.cc
@@ -33,7 +33,7 @@ bool derivationIsCA(DerivationType dt) {
     };
     // Since enums can have non-variant values, but making a `default:` would
     // disable exhaustiveness warnings.
-    abort();
+    assert(false);
 }
 
 bool derivationIsFixed(DerivationType dt) {
@@ -42,7 +42,7 @@ bool derivationIsFixed(DerivationType dt) {
     case DerivationType::CAFixed: return true;
     case DerivationType::CAFloating: return false;
     };
-    abort();
+    assert(false);
 }
 
 bool derivationIsImpure(DerivationType dt) {
@@ -51,7 +51,7 @@ bool derivationIsImpure(DerivationType dt) {
     case DerivationType::CAFixed: return true;
     case DerivationType::CAFloating: return false;
     };
-    abort();
+    assert(false);
 }
 
 
diff --git a/src/libstore/s3-binary-cache-store.cc b/src/libstore/s3-binary-cache-store.cc
index 1b7dff085..67935f3ba 100644
--- a/src/libstore/s3-binary-cache-store.cc
+++ b/src/libstore/s3-binary-cache-store.cc
@@ -343,13 +343,10 @@ struct S3BinaryCacheStoreImpl : public S3BinaryCacheStore
             std::chrono::duration_cast<std::chrono::milliseconds>(now2 - now1)
                 .count();
 
-        auto size = istream->tellg();
-
-        printInfo("uploaded 's3://%s/%s' (%d bytes) in %d ms",
-            bucketName, path, size, duration);
+        printInfo("uploaded 's3://%s/%s' in %d ms",
+            bucketName, path, duration);
 
         stats.putTimeMs += duration;
-        stats.putBytes += size;
         stats.put++;
     }
 
diff --git a/src/libstore/s3-binary-cache-store.hh b/src/libstore/s3-binary-cache-store.hh
index 4d43fe4d2..b2b75d498 100644
--- a/src/libstore/s3-binary-cache-store.hh
+++ b/src/libstore/s3-binary-cache-store.hh
@@ -19,7 +19,6 @@ public:
     struct Stats
     {
         std::atomic<uint64_t> put{0};
-        std::atomic<uint64_t> putBytes{0};
         std::atomic<uint64_t> putTimeMs{0};
         std::atomic<uint64_t> get{0};
         std::atomic<uint64_t> getBytes{0};