diff --git a/.circleci/config.yml b/.circleci/config.yml
index ee2098320..4fc84f231 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -510,6 +510,7 @@ jobs:
 
   b_ubu: &b_ubu
     <<: *base_ubuntu2004_xlarge
+    resource_class: medium
     steps:
       - checkout
       - run: *run_build
@@ -521,6 +522,7 @@ jobs:
   # x64 ASAN build, for testing for memory related bugs
   b_ubu_asan: &b_ubu_asan
     <<: *base_ubuntu2004_xlarge
+    resource_class: medium
     environment:
       CMAKE_OPTIONS: -DSANITIZE=address
       MAKEFLAGS: -j 10
@@ -533,6 +535,7 @@ jobs:
 
   b_ubu_clang: &b_ubu_clang
     <<: *base_ubuntu2004_clang_xlarge
+    resource_class: medium
     steps:
       - checkout
       - run: *run_build
@@ -541,6 +544,7 @@ jobs:
 
   b_ubu_asan_clang: &b_ubu_asan_clang
     <<: *base_ubuntu2004_clang
+    resource_class: medium
     environment:
       CC: clang
       CXX: clang++
@@ -568,12 +572,14 @@ jobs:
 
   b_ubu_release: &b_ubu_release
     <<: *b_ubu
+    resource_class: medium
     environment:
       FORCE_RELEASE: ON
       MAKEFLAGS: -j 10
 
   b_ubu_static:
     <<: *base_ubuntu2004_xlarge
+    resource_class: medium
     environment:
       MAKEFLAGS: -j 10
       CMAKE_OPTIONS: -DCMAKE_BUILD_TYPE=Release -DUSE_Z3_DLOPEN=ON -DUSE_CVC4=OFF -DSOLC_STATIC_STDLIBS=ON
@@ -587,6 +593,7 @@ jobs:
 
   b_ubu_codecov:
     <<: *base_ubuntu2004_xlarge
+    resource_class: medium
     environment:
       COVERAGE: ON
       CMAKE_BUILD_TYPE: Debug
@@ -622,6 +629,7 @@ jobs:
   # Do *NOT* store any artifacts or workspace as we don't run tests on this build.
   b_ubu_cxx20:
     <<: *base_ubuntu2004_xlarge
+    resource_class: medium
     environment:
       CMAKE_BUILD_TYPE: Debug
       CMAKE_OPTIONS: -DCMAKE_CXX_STANDARD=20 -DUSE_CVC4=OFF
@@ -632,6 +640,7 @@ jobs:
 
   b_ubu_ossfuzz: &b_ubu_ossfuzz
     <<: *base_ubuntu1604_clang
+    resource_class: medium
     steps:
       - checkout
       - run: *setup_prerelease_commit_hash
@@ -657,6 +666,7 @@ jobs:
 
   b_archlinux:
     <<: *base_archlinux
+    resource_class: medium
     environment:
       TERM: xterm
       MAKEFLAGS: -j 3
@@ -737,6 +747,7 @@ jobs:
 
   b_ems:
     <<: *base_ems_xlarge
+    resource_class: medium
     steps:
       - checkout
       - run:
@@ -846,6 +857,7 @@ jobs:
 
   t_ubu_ubsan_clang_soltest:
     <<: *base_ubuntu2004_clang
+    resource_class: medium
     environment:
       EVM: << pipeline.parameters.evm-version >>
     steps: