diff --git a/build_info.json b/build_info.json
index a1f2b46..22c98f6 100644
--- a/build_info.json
+++ b/build_info.json
@@ -1,8 +1,8 @@
 {
     "build_time": "",
     "source files": {
-        "version": "v2.8.2",
-        "commit": "b15dedb36666df299d532ebacd861ff40858857b",
+        "version": "v2.8.2-3-g123299b",
+        "commit": "123299b87ded3cb6fbc945ccfc039c2140d8c7e0",
         "dirty": false
     },
     "pytex": {
@@ -421,23 +421,23 @@
         {
             "name": "environments/groupthm/groupthm.sty",
             "source file": "environments/groupthm/groupthm.dtx",
-            "build time": "2022/02/03 14:11",
-            "source version": "v2.8.2",
-            "source commit hash": "b15dedb36666df299d532ebacd861ff40858857b",
+            "build time": "2022/02/03 14:45",
+            "source version": "v2.8.2-3-g123299b",
+            "source commit hash": "123299b87ded3cb6fbc945ccfc039c2140d8c7e0",
             "pytex version": "v1.2.0-31-gc9bb0e8",
             "pytex commit hash": "c9bb0e87c91beae3e17a829603e4459cf804ec51",
-            "md5sum": "f1cce2b87d3e6d2b320b84daece33f22",
+            "md5sum": "0f33140e20147b63d152a6fbac866730",
             "dirty": false
         },
         {
             "name": "environments/fancythm/fancythm.sty",
             "source file": "environments/fancythm/fancythm.dtx",
-            "build time": "2022/02/03 14:11",
-            "source version": "v2.8.2",
-            "source commit hash": "b15dedb36666df299d532ebacd861ff40858857b",
+            "build time": "2022/02/03 14:45",
+            "source version": "v2.8.2-3-g123299b",
+            "source commit hash": "123299b87ded3cb6fbc945ccfc039c2140d8c7e0",
             "pytex version": "v1.2.0-31-gc9bb0e8",
             "pytex commit hash": "c9bb0e87c91beae3e17a829603e4459cf804ec51",
-            "md5sum": "e659775e98a2451a69f4bf6ab66917f0",
+            "md5sum": "de5651d5fb829ae4a174d0d9e333d2dd",
             "dirty": false
         }
     ]
diff --git a/environments/fancythm/fancythm.sty b/environments/fancythm/fancythm.sty
index cabaefa..28afd59 100644
--- a/environments/fancythm/fancythm.sty
+++ b/environments/fancythm/fancythm.sty
@@ -23,7 +23,6 @@
 %% File: fancytm.dtx
 \ProvidesExplPackage{fancythm}{2022/01/30}{0.0.2}{Grouped theorems.}
 \RequirePackage{l3keys2e}
-\RequirePackage{groupthm}
 \RequirePackage[default styles]{thmstyle}
 \cs_set_eq:NN \arabic:n \arabic
 \cs_set_eq:NN \counter_new:n \newcounter
@@ -109,24 +108,35 @@
 \tl_new:N    \l__fancythm_name_tl
 \clist_new:N \l__fancythm_thmtools_clist
 \clist_new:N \l__fancythm_group_clist
+\clist_new:N \g__fancythm_groupthm_option_clist
 \keys_define:nn { fancythm }
   {
-    translator        .bool_set:N   = \g__fancythm_translator_bool        ,
-    translator        .default:n    = { true }                            ,
-    generate defaults .bool_set:N   = \g__fancythm_generate_defaults_bool ,
-    generate defaults .default:n    = { true }                            ,
+    translator        .bool_set:N   = \g__fancythm_translator_bool           ,
+    translator        .default:n    = { true }                               ,
+    generate defaults .bool_set:N   = \g__fancythm_generate_defaults_bool    ,
+    generate defaults .default:n    = { true }                               ,
     number in         .choices:nn   =
       { document, section, subsection, chapter, part }
       {
         \counter_alias:nx { toplevel } { in \tl_use:N \l_keys_choice_tl }
-      }                                                                   ,
-    number in         .default:n    = { document }                        ,
+      }                                                                      ,
+    number in         .default:n    = { document }                           ,
     style             .choices:nn   =
       { fancy, plain, classic }
       {
         \str_set:Nn \g__fancythm_style_str { \tl_use:N \l_keys_choice_tl }
-      }                                                                   ,
-    style             .default:n    = { fancy }                           ,
+      }                                                                      ,
+    style             .default:n    = { fancy }                              ,
+    cache             .code:n       =
+      {
+        \clist_put_right:Nn \g__fancythm_groupthm_option_clist { cache = #1 }
+      }                                                                      ,
+    cache             .default:n    = { true }                               ,
+    cache version     .code:n       =
+      {
+        \clist_put_right:Nn \g__fancythm_groupthm_option_clist { cache version = #1 }
+      }                                                                      ,
+    cache version     .default:n    = { 0 }                                  ,
   }
 \keys_define:nn { fancythm / fancytheorem }
   {
@@ -143,6 +153,13 @@
   }
 \keys_set:nn { fancythm } { translator, generate defaults, number in, style }
 \ProcessKeysOptions{ fancythm }
+
+\cs_new:Npn \__fancythm_require_package:nn #1
+  {
+    \RequirePackage [ #1 ]
+  }
+\cs_generate_variant:Nn \__fancythm_require_package:nn { V n }
+\__fancythm_require_package:Vn \g__fancythm_groupthm_option_clist { groupthm }
 \bool_if:NTF \g__fancythm_translator_bool
   {
     \RequirePackage{translator}
diff --git a/environments/groupthm/groupthm.sty b/environments/groupthm/groupthm.sty
index 44cbb3d..ec13476 100644
--- a/environments/groupthm/groupthm.sty
+++ b/environments/groupthm/groupthm.sty
@@ -895,6 +895,7 @@
   }
   {
     \cs_set_eq:NN \__groupthm_cache:n \use_none:n
+    \cs_set_eq:NN \__groupthm_cache_slow:n \use_none:n
     \cs_set_eq:NN \__groupthm_lazy:n \use:n
   }
 \groupthm_new_group:nnnnn { all        } { } { } { } {               }