diff --git a/src/vdaf/poplar1.rs b/src/vdaf/poplar1.rs
index 70c572db..df5da34b 100644
--- a/src/vdaf/poplar1.rs
+++ b/src/vdaf/poplar1.rs
@@ -855,7 +855,7 @@ impl<P: Xof<SEED_SIZE>, const SEED_SIZE: usize> Vdaf for Poplar1<P, SEED_SIZE> {
     type AggregateShare = Poplar1FieldVec;
 
     fn algorithm_id(&self) -> u32 {
-        0x00001000
+        0x00000006
     }
 
     fn num_aggregators(&self) -> usize {
diff --git a/src/vdaf/prio3.rs b/src/vdaf/prio3.rs
index 3936730e..e38d91d6 100644
--- a/src/vdaf/prio3.rs
+++ b/src/vdaf/prio3.rs
@@ -78,7 +78,7 @@ pub type Prio3Count = Prio3<Count<Field64>, XofTurboShake128, 16>;
 impl Prio3Count {
     /// Construct an instance of Prio3Count with the given number of aggregators.
     pub fn new_count(num_aggregators: u8) -> Result<Self, VdafError> {
-        Prio3::new(num_aggregators, 1, 0x00000000, Count::new())
+        Prio3::new(num_aggregators, 1, 0x00000001, Count::new())
     }
 }
 
@@ -100,7 +100,7 @@ impl Prio3SumVec {
         Prio3::new(
             num_aggregators,
             1,
-            0x00000002,
+            0x00000003,
             SumVec::new(bits, len, chunk_length)?,
         )
     }
@@ -130,7 +130,7 @@ impl Prio3SumVecMultithreaded {
         Prio3::new(
             num_aggregators,
             1,
-            0x00000002,
+            0x00000003,
             SumVec::new(bits, len, chunk_length)?,
         )
     }
@@ -150,7 +150,7 @@ impl Prio3Sum {
             )));
         }
 
-        Prio3::new(num_aggregators, 1, 0x00000001, Sum::new(bits)?)
+        Prio3::new(num_aggregators, 1, 0x00000002, Sum::new(bits)?)
     }
 }
 
@@ -248,7 +248,7 @@ impl Prio3Histogram {
         Prio3::new(
             num_aggregators,
             1,
-            0x00000003,
+            0x00000004,
             Histogram::new(length, chunk_length)?,
         )
     }
@@ -276,7 +276,7 @@ impl Prio3HistogramMultithreaded {
         Prio3::new(
             num_aggregators,
             1,
-            0x00000003,
+            0x00000004,
             Histogram::new(length, chunk_length)?,
         )
     }
@@ -300,7 +300,7 @@ impl Prio3MultihotCountVec {
         Prio3::new(
             num_aggregators,
             1,
-            0xFFFF0000,
+            0x00000005,
             MultihotCountVec::new(num_buckets, max_weight, chunk_length)?,
         )
     }
@@ -329,7 +329,7 @@ impl Prio3MultihotCountVecMultithreaded {
         Prio3::new(
             num_aggregators,
             1,
-            0xFFFF0000,
+            0x00000005,
             MultihotCountVec::new(num_buckets, max_weight, chunk_length)?,
         )
     }