diff --git a/archives/prospr_core.tar.gz b/archives/prospr_core.tar.gz
index ac77c8a..bbdaa29 100644
Binary files a/archives/prospr_core.tar.gz and b/archives/prospr_core.tar.gz differ
diff --git a/archives/prospr_core.zip b/archives/prospr_core.zip
index 44c511e..ffe9392 100644
Binary files a/archives/prospr_core.zip and b/archives/prospr_core.zip differ
diff --git a/prospr/_version.py b/prospr/_version.py
index b87fc0c..bff3210 100644
--- a/prospr/_version.py
+++ b/prospr/_version.py
@@ -1 +1 @@
-__version__ = "1.2.9"
+__version__ = "1.2.10"
diff --git a/prospr/core/src/depth_first_bnb.cpp b/prospr/core/src/depth_first_bnb.cpp
index 3ddbc5e..b80b5c9 100644
--- a/prospr/core/src/depth_first_bnb.cpp
+++ b/prospr/core/src/depth_first_bnb.cpp
@@ -104,7 +104,8 @@ bool reach_prune(Protein *protein, int move, int best_score,
 void try_store_checkpoint(const Protein &protein,
                           const std::stack<int> &dfs_stack, int move,
                           bool placed_amino, int best_score, int score,
-                          const std::vector<int> &best_hash, int iterations) {
+                          const std::vector<int> &best_hash,
+                          uint64_t iterations) {
   /* Return if cache not in use. */
   auto cache_dir = get_cache_dir("depth_first_bnb", true);
   if (!cache_dir) {
@@ -170,7 +171,7 @@ void try_store_checkpoint(const Protein &protein,
 void try_load_checkpoint(Protein &protein, std::stack<int> &dfs_stack,
                          int &move, bool &placed_amino, int &best_score,
                          int &score, std::vector<int> &best_hash,
-                         int &iterations) {
+                         uint64_t &iterations) {
   /* Return if cache not in use. */
   auto cache_dir = get_cache_dir("depth_first_bnb");
   if (!cache_dir) {
@@ -250,7 +251,7 @@ void try_load_checkpoint(Protein &protein, std::stack<int> &dfs_stack,
         best_hash.push_back(std::stoi(token));
       }
     } else if (key == "iterations")
-      iterations = std::stoi(value) - 1;
+      iterations = std::stoull(value) - 1;
   }
 }
 
@@ -333,7 +334,7 @@ void depth_first_bnb(Protein *protein, std::string prune_func) {
   std::vector<int> best_hash;
 
   int signal = 0;
-  int iterations = 0;
+  uint64_t iterations = 0;
 
   /* Load intermediate solution from cache if present. */
   try_load_checkpoint(*protein, dfs_stack, move, placed_amino, best_score,
diff --git a/prospr/core/src/utils.cpp b/prospr/core/src/utils.cpp
index b610ef0..e374fdf 100644
--- a/prospr/core/src/utils.cpp
+++ b/prospr/core/src/utils.cpp
@@ -181,8 +181,8 @@ void load_protein_state(Protein &protein, std::istream &in) {
         protein.place_amino(std::stoi(token));
       }
     } else if (key == "aminos_placed")
-      protein._set_aminos_placed(std::stoi(value));
+      protein._set_aminos_placed(std::stoull(value));
     else if (key == "solutions_checked")
-      protein._set_solutions_checked(std::stoi(value));
+      protein._set_solutions_checked(std::stoull(value));
   }
 }